Option D is correct. A specific element's isotopes have different masses because the number of neutrons in their nuclei varies.
Protons, neutrons, and electrons make up the three particles that make up an atom. Protons and neutrons both have masses that are roughly equal to one atomic mass unit, while the electron has a very small mass that is typically taken to be zero.
The number of protons in an atom's nucleus determines its identity, but the number of neutrons has no bearing on this. For instance, carbon has six protons and is a solid found in nature in the forms of coal, graphite, and diamond. Nitrogen, an inert gas that is very dissimilar to carbon, is the element with seven protons.
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Complete question-
The atoms of various isotopes of a particular element differ from each other in the number of:
a. Electrons in the outer shell only
b. Protons in the nucleus
c. Electrons in the inner shell only
d. Neutrons in the nucleus
What do you call the small structures in eukaryotic cells that carry out specific functions?
what is the correct sequence of path that light follows before reaching our eyes on the microscope we are using in lab?
The correct sequence of path that the light follows before reaching our eyes on the microscope is Light source → Condenser and Mirror → Specimen → Objective lens → Intermediate image → Eyepiece lens → Human eye.
Hence, the correct option is option a.
We use microscopes in labs in order to observe microscopic elements. In the microscope, the light comes from a particular light source. The light then falls into the mirror and this is done with the help of a condenser .
The light then moves in the upward direction and gets reflected to fall on the specimen and then from the specimen this light passes upward in the objective lens. The objective lens receives the light and forms an image. The observer will then be able to see the image through the eyepiece lens.
--The given question is incomplete, the complete question is
"What is the correct sequence of path that light follows before reaching our eyes on the microscope we are using in lab?
A. Light source → Condenser and Mirror → Specimen → Objective lens → Intermediate image → Eyepiece lens → Human eye
B. Light source → Specimen → Condenser and Mirror → Intermediate image → Objective lens → Eyepiece lens → Human eye
C. Light source → Specimen → Intermediate image → Objective lens → Eyepiece lens → Human eye → Condenser and Mirror
D. Human eye → Specimen → Condenser and Mirror → intermediate Image → Objective lens → Eyepiece lens → Light source"--
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the average number of divisions that a human cell cultured in a dish can undergo is group of answer choices 10-20. 30-40. 40-60. 60-100 0.
The average number of divisions that a human cell cultured in a dish can undergo is approximately c)40-60.
This range is known as the Hayflick limit, which states that normal human cells have a finite number of divisions before they stop growing and eventually die. This limit helps to prevent cells from becoming cancerous and uncontrolled in growth.
The exact number of divisions can vary depending on various factors such as the type of cell, the conditions in which it is grown, and the presence of certain growth factors or mutations. However, on average, human cells can divide about 50 to 70 times before reaching the Hayflick limit.
It is important to note that this limit does not apply to all cells, such as cancer cells, which have the ability to divide endlessly and evade the Hayflick limit. Understanding the Hayflick limit and its mechanisms has provided important insights into aging, cell biology, and the development of cancer.
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Based on the data in the figure, what type of selection for body size appears to be occurring in these marine iguanas?A)Directional selection B)Stabilizing selection C)Disruptive selection D)You cannot make this determination from this data
Correct option is (B) Stabilizing selection.
Natural selection that stabilizes the population mean at a specific non-extreme trait value is known as stabilizing selection (not to be confused with negative or purifying selection). Because most qualities don't seem to change significantly over time, this is regarded to be natural selection's most frequent mechanism of operation. Negative selection, also known as purifying selection, is frequently used in stabilizing selection to choose against the extreme values of the character. Disruptive selection's opposite is stabilizing selection. It prefers the intermediate variants rather than people with extreme traits. The more severe phenotypes are typically eliminated through stabilizing selection, which leads to the reproductive success of the average or typical phenotypes.
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the small structures within the cytoplasm of a eukaryotic cell that perform specific functions are called
Answer:
They are called Organelles!
Explanation:
Hope this helps!
Bacteria and archaeans are similar in all of the following ways except _____.(a) they are both relatively small compared to eukaryotic cells(b) they both reproduce rapidly(c) they both have complex membrane-bound organelles(d) they both lack a true nucleus.
Bacteria and archaeans are similar in all of the following ways except (c) they both have complex membrane-bound organelles.
The cells that makeup prokaryotes are the only components of unicellular creatures known as prokaryotes. In contrast to eukaryotic cells, bacterial cells are quite straightforward in their structure and function. Because of their diminutive stature, prokaryotes are invisible to our unaided visual systems. Prokaryotes can be found in their free-living forms or attached to or contained within other creatures.
Bacteria and archaea are both examples of prokaryotes, which are single-celled microorganisms that lack nuclei. On the other hand, we belong to the Eukarya kingdom, which also includes all other animals, plants, fungi, and single-celled protists. These are all examples of organisms whose cells have nuclei that separate their DNA from the rest of the cell.
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the small structures within the cytoplasm of a eukaryotic cell that perform specific functions are called
Organelles are the microscopic parts of a eukaryotic cell's cytoplasm that carry out particular tasks. Within eukaryotes, organelles perform unique tasks like energy production.
What are the cytoplasmic structures that carry out particular tasks?The "little organs" known as cytoplasmic organelles are suspended within the cytoplasm of every cell. Every type of organelle has a distinct and specific structure and performs a particular function in a cell. The mitochondrion, ribosomes, endoplasmic reticulum, golgi apparatus, and lysosomes are a few examples of cytoplasmic organelles which have an important function in cellular mechanism.
Who made the first cells' organelles?Brown discovered and characterized the nucleus, the first organelle, in 1833. Schleiden argued that all plant tissues were made up of nucleated cells in 1838, synthesizing the diverse and varied data into a cell hypothesis.
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which organism did gregor mendel use to discover the basic principles of genetics? mus musculus (mouse) caenorhabditis elegans (nematode worm) escherichia coli (bacterium) pisum sativum (pea plant)
pisum sativum (pea plant). The garden pea, Pisum sativum, served as a model system for Mendel's major research.
Some geneticists still do inheritance research on pea plants because they constitute an ideal model for such investigations. Gregor Mendel developed the mathematical groundwork for genetics by carefully growing garden peas, which allowed him to discover the fundamental ideas of heredity. Heredity is passed down in distinct units, according to Gregor Mendel's research with peas. People have long been aware of the similarities between parents and children in human families as well as in families of animals and plants. The study of heredity was made into a science by Gregor Johann Mendel.
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I am not sure how to identify this and please help me delete a post in brainly I Know you can't but if possible somehow let me know and I really need this science ASAP!
3) is a pure substance
1) Is a het----erogenous mixture
4) Represents both compounds and elements
What are chemical compounds?Chemical compounds are substances made up of two or more different elements that are chemically combined in a fixed ratio. The elements in a compound are bonded together through chemical bonds, forming a new substance with unique physical and chemical properties that are different from those of the individual elements.
A mixture is made up of two or more substances that are not chemically combined together.
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The central nervous system consists of the brain and spinal cord, and there are approximately 86 billion neurons in the human brain.a. Trueb. False
a. True.The central nervous system (CNS) is indeed composed of the brain and spinal cord and there are approximately 86 billion neurons in the human brain.
Neurons are the primary cells of the nervous system and are responsible for transmitting information between different parts of the body. The human brain is one of the most complex and sophisticated structures in the known universe and its incredible computational power is made possible by the sheer number of neurons and their connections, known as synapses. Understanding the function and structure of the CNS is one of the major goals of neuroscience and continues to be a source of ongoing research and discovery.
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Which of the following can cause changes in an environment and affect population of organisms?
A: Natural disasters such as hurricane or fire
B: Human influence such as pollution
C: Extinction of species
D: All of above
The following which can cause changes in an environment and affect population of organisms are all of the above and is therefore denoted as option D.
What is Population?This is referred to as the total number of people or species in a particular area at a given point in time.
Several factors affect population and an example is natural disaster which could lead to the death and decrease of the species and also extinction of species which means that the species are no longer present in such area.
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damage to the neural tube would consist of: problems with the formation of the digestive system. the umbilical cord not connecting the placenta to the uterus. the skin not developing pores and hair follicles. the spinal cord and brain not developing correctly.
Damage to the neural tube would consist of the spinal cord and brain not developing correctly. Thus the correct answer is option D.
Birth malformations known as neural tube defects can affect the brain, spine, or spinal cord. They frequently occur during the first month of pregnancy before the woman even realizes she is pregnant. Spina bifida and anencephaly are the two neural tube abnormalities that are most frequently identified. The fetal spinal column does not entirely shut in spina bifida. Leg paralysis from nerve injury is normal at least to some extent. The majority of the skull and brain do not develop in anencephaly. Anencephalic newborns frequently deliver stillborn babies or pass very soon after birth. The Chiari malformation is a particular defect that causes the brain matter to extend into the spinal canal.
The proper question is:
Damage to the neural tube would consist of:
(A). problems with the formation of the digestive system.
(B). the umbilical cord not connecting the placenta to the uterus.
(C). the skin not developing pores and hair follicles.
(D). the spinal cord and brain not developing correctly.
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polar bears and penguins electronegativity and polarity. True or False
Because polar bears & penguins share habitats surroundings in terms of electronegativity and polarity, this statement is accurate.
Which habitats environments serve as examples?Lakes, streams, woods, deserts, grasslands, and even a single drop of water are examples of habitats. The biosphere includes every habitat on the planet. Habitats change often because the Planet is constantly changing. Biomes are geographically distinct environments with comparable flora and weather.
What are child habitats?An mammal or a plant's habitat serves as its home. Some types of creatures and plants can be found in almost every location on Earth, including the hottest desert and the coldest ice pack. The majority of environments also have water, air, soil or sand, rocks, and a variety of animals and plants.
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for goldfish, solid orange coloring is dominant while orange with black spots is recessive. a total of 2500 goldfish were stocked in an outdoor pond, 2275 solid orange and 225 orange with black spots. since the fish came from a protected, indoor, stable environment, you may assume the stocked population was in equilibrium. what are the allele and genotype frequencies in the original stocked population?
For goldfish, solid orange coloring is dominant, and their number is 2275; orange with black spots is recessive, and their number is 225; and there are a total of 2500 goldfish, so the genotype frequency of orange-black is 0.09, and solid orange has 0.91.
What is the frequency of alleles in goldfish?Out of 2500 goldfish, 225 are orange with black spots, so the genotypic frequency ([tex]{q}^2[/tex]) is 225/2500, which is 0.09, so the allelic frequency is 0.3, and the dominant allelic frequency is 0.7. The calculation is given here.
= [tex]{q}^2[/tex] =0.09
= q= √0.09=0.3
As per Hardy weignberg, P+q=1
Hence, P= 1-q
P= 1 - 0.3 = 0.7
Genotype of purebred dominant
= PP= 0.7×0.7=0.49
(out of 100, 49 are dominant,
out of 2500 =1225)
Heterozygous dominant
=2Pq = 2×0.7×0.3=0.42
(out of 100, 42 are Heterozygous ,
out of 2500 =1050)
Purebred recessive
=qq =0.3×0.3=0.09
(out of 100, 9 are recessive,
out of 2500 =225)
Hence, for goldfish, solid orange coloring is dominant, and their number is 2275; orange with black spots is recessive, and their number is 225; and there are a total of 2500 goldfish, so the genotype frequency of orange-black is 0.09, and solid orange has 0.91.
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which part of the dna molecule codes for information that is translated into proteins? A. Phospate group B. Hydrogens bounds C. Deoxyribose D. Nitrogen bases
The nitrogen bases present in the DNA molecule code for the information which is translated into proteins.
Hence, the option D is the correct option.
DNA or the deoxyribonucleic acid is basically the hereditary material which is present in humans and almost all the other organisms that are found in nature. Nearly every single cell that is present in our body possesses the same DNA.
All the information that is stored in the DNA is in the form of a code which is made up of four types of chemical bases namely adenine (A), guanine (G), cytosine (C), and thymine (T). The human DNA is composed of nearly 3 billion bases, and also more than 99 percent of these bases are the same in all humans. The order, or the sequence, of these bases basically determines the available information for building as well as maintaining a particular organism.
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not completely accurate, so it is not useful at all. Harmony argues that it helped establish the periodic table we use today, making
more
24. Darla claims that the first periodic table developed by Mendeleev1
credible. Who is correct and why? (2 points)
© Darla is correct, becausgy model that has any mistakes should be thrown out.
© Darla is correct, because a good model would not need to change.
Harmony is correct, because Mendeleev's model had all of the information correct in the first version.
• Harmony I correct, because Mendeleev's model made predictions that came true.
Harmony is correct, because Mendeleev's model made predictions that came true.
What is Mendeleev's model?Mendeleev's periodic table was a significant contribution to the understanding of the chemical elements and their properties. It was not without errors and mistakes, but its ability to make accurate predictions about the properties of then-unknown elements was a key factor in establishing its credibility and usefulness.
Mendeleev's periodic table provided a framework for organizing the elements based on their atomic structure and paved the way for future scientists to refine and improve upon his original model. This ultimately led to the development of the modern periodic table that is widely used today.
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monocytes differentiate into large phagocytic cells. True or False
Because monocytes may develop into big phagocytic cells, this statement is accurate.
What does a high monocyte count mean?A elevated monocyte count might indicate a number of various illnesses. It frequently has connections to autoimmune disorders like lupus or infectious diseases like mononucleosis. Monocytosis may result from some drugs. Additionally, it has associations with diseases including blood problems and certain malignancies.
What monocyte count identifies leukaemia?A high concentration of monocytes—more than 1,000 per microliter—is a typical indicator of CMML. Low levels of additional white blood cells, red blood cells, or blood platelets are further symptoms.
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what part of the nitrogen cycle deals with the conversion of nitrogen in waste products (urea in urine) into ammonia?
Ammonification , Ammonification (decay) (decay) This is the transformation of organic nitrogen (for example, in deceased organisms and their excretions) into inorganic nitrogen.
The ammonification process is carried out by a diverse group of soil fungus and bacteria known as decomposers.
Ammonification. When an organism excretes waste or dies, organic nitrogen accumulates in its tissues (e.g. amino acids, DNA). Ammonification occurs when various fungi and prokaryotes degrade the tissue and release inorganic nitrogen back into the ecosystem as ammonia. Urea is converted into ammonia nitrogen during wastewater treatment.
Because ammonia has a negative effect on BOD and chlorine demand, excessive levels of ammonia in wastewater effluents are undesirable. The nitrification process is used to convert ammonia to nitrates.
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Is lipid structure in foods you eat linked to heart disease? The media is full of advice on what you should and should not eat, but these recommendations often change from year to year. You may have heard that polyunsaturated fats are heart healthy and saturated fats are not, but is it really that simple? How you prepare food can affect the amount of saturated fats that you eat. For exa fat than if you were to eat the same meat raw. you cook meat on a grill, the product will have less saturated - Part A What occurs during the process of cooking the meat on a grill that would explain this result? What cours during the process of cooking the meat on a grill that would explain this result? The saturated fat in meat undergoes a change in its physical state as it is heated from a semisolid consistency to aliquid and then to gaseous. When meat is grilled, the liquefied fat boils and evaporates, resulting in less saturated fat in the final product The saturated fat in meat undergoes a change in its physical state as it is heated - from a semisolid consistency to a liquid. When meat is grilled, the liquefied fat drips off, resulting in less saturated fat in the final product from a semisolid consistency to aliquid in its liquid The saturated fat in meat undergoes a change in its physical state as it is heated form it is easier for the saturated fat to transform into unsaturated one. from saturated to unsaturated. When meat lored The saturated fat in meat undergoes a change in its chemical state as it is heated the saturated fat transforms, resulting in loss saturated fat in the final product. Submit Previous Answers Request Answer
The method of grilling meat can lower the quantity of saturated fat in the finished product. The heat from the grill causes the liquid fat to boil and evaporate. As a result, the finished product.
has less saturated fat. In other words, once meat is cooked, the physical condition of the saturated fat changes, resulting in a decrease of saturated fat in the final product.The method of grilling meat can lower the quantity of saturated fat in the finished product. The heat from the grill causes the liquid fat to boil and evaporate. As a result, the finished product. This can be a good method to cut back on saturated fat in your diet, but keep in mind that other factors, such as how the meat was reared and processed, also have a role in the amount and type of fat in meat.
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does the use of dna sequences in the study of evolutionary relationships mean that other characteristics are unimportant in such studies? explain your answer.
Studies of evolutionary relationships uncover more characteristics which are also important.
How the DNA sequences can be used in the study of evolutionary relationships?The experiment "Comparing DNA Sequences to Understand Evolutionary Relationships using BLAST" provided information that can be used in future studies. After conducting your research, you will understand that species can be connected based on gene sequences. It is because of these nucleotides or proteins that the resultant features are identical. If the technique was more thorough and the goal was clarified, the experiment and its outcomes would be easier to understand. The unique gene sequences that underlie the existence and diversity of organisms everywhere in the globe. All organisms would be identical if their gene sequences were the same. Nothing would alter or evolve.
Although all scientists can discover accurate and trustworthy evidence for evolutionary links using DNA sequences, this does not imply that other features are not significant in these research. Fossils and other tests are used by scientists to learn how organisms developed.
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what class of organic molecule is used as an immediate energy source for most organisms?
Almost all cells can utilise carbohydrates as an immediate source of energy, but in many photosynthetic species, a sizable amount of the carbohydrates will be used for the manufacture of storage goods like starch or structural materials like the cellulose found in cell walls.
Carbohydrates have a number of roles in living things. Starch and glycogen are two examples of polysaccharides that act as both building blocks and energy reserves (e.g. cellulose in plants and chitin in arthropods). The coenzyme building unit ribose, a 5-carbon monosaccharide, is also the genetic building block for RNA (such as ATP, FAD, and NAD). Deoxyribose, a molecule related to glucose, is present in DNA. Additional significant macromolecules, including those involved in the immune system, fertilization, preventing disease, blood coagulation, and development, are abundant in saccharides and their derivatives.
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as adults age, the walls of their arterioles become less elastic, increasing resistance and decreasing compliance. how does this affect the blood pressure?
artery arteriole Arteriole walls grow more elastic as they get older, which raises resistance and lowers compliance. The increased blood pressure occurs as a result.
What use do the arterioles of the body serve?
Every cell in your body receives oxygen-rich blood through its arteries, which therefore transfer it to the heart. They are a part of the cardiovascular system in people. They are necessary provide the your body the oxygen, vitamins, and hormones it needs.
Do arteries have an impact on blood pressure?
The biggest reduction in blood pressure is caused by arterioles, which also have the highest resistance rise. Arteriole constriction raises resistance, which helps control blood to downstream capillaries therefore lowers blood pressure more significantly.
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g what is a hominin? a a member of the clade that includes humans and all other primates b a member of the clade that includes humans, great apes, chimpanzees, and bonobos
A hominin is a member of the clade that includes humans and all other primates (great apes, chimpanzees, and bonobos).
Hominin is a clade that includes humans and all other primates that are ancestral to humans. This group includes species such as homo sapiens (modern humans), Neanderthals, and early human ancestors like Australopithecus. Hominins are characterized by a number of unique adaptations such as bipedalism and larger brains, primates which set them apart from other primates. The study of hominins is important for understanding human evolution and the development of human-specific traits over time.
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One of the traits Gregor Mendel studied was flower color in pea plants. Mendel found that purple color factor was dominant to white color factor. Now, we know that Mendel's factors are genes, or alleles.
Look at the F1 generation produced when two parent plants are crossed.
Then, look at the F2 generation produced when two F1 plants are crossed. What can you infer about the original parents' genotype and phenotype? Choose the a statement that apply.
A. Both the parents were homozygous for white flowers.
B. Both the parents were homozygous for purple flowers.
C. One parent was homozygous for white flowers and the other was homozygous
for purple flowers.
D. Both parents had purple flowers.
Answer:
C. One parent was homozygous for white flowers and the other was homozygous for purple flowers.
Answer:
Explanation:
. One parent was homozygous for white flowers and the other was homozygous for purple flowers.
nonmembranous structure composed of two rodlike centrioles is called ?
Centrosome. It is a non-membranous structure made up of two centrioles that resemble rods. During cell division, it aids in the distribution of chromosomes to new cells.
A centrosome is a cellular component that aids in cell division. The centrosome duplicates prior to cell division, and when division starts, the two centrosomes move to the opposite ends of the cell. Between the two centrosomes, a spindle of microtubule-containing proteins forms, which aids in separating the daughter cells' replicated chromosomes. The structure of the cell that actually coordinates the movement of the cells away from one another is the spindle, which is made of microtubules. It is known as the microtubule organizing center because the centrosomes organize the microtubules. Centrosomes divide twice prior to cell division, aiding in the organization of microtubules and the cell division procedure.
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how are the nucleotides in a single polynucleotide chain linked together?
The nucleotides in a single polynucleotide chain are linked together through a type of covalent bond called a phosphodiester bond.
A nucleotide is made up of three components: a nitrogen-containing base (adenine, guanine, cytosine, or thymine), a sugar molecule (ribose or deoxyribose), and a phosphate group. In a single polynucleotide chain, the nucleotides are linked together by covalent bonds between the sugar molecule of one nucleotide and the phosphate group of the next. Specifically, the 3'-carbon of the sugar molecule in one nucleotide is bonded to the 5'-phosphate group of the next nucleotide through a phosphodiester bond. This creates a sugar-phosphate backbone that extends along the entire length of the polynucleotide chain. The nitrogen-containing bases extend from the sugar molecule, forming the rungs of the DNA ladder, and providing the genetic information encoded in the DNA molecule. The specific sequence of nitrogen-containing bases determines the information stored in the DNA molecule.
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muscle cell contraction is facilitated by a small electrical current. which types of molecules are likely involved?
Answer:
Explanation:
Muscle cell contraction is facilitated by the movement of ions across the cell membrane, resulting in a small electrical current. The two types of ions involved in this process are sodium (Na+) and potassium (K+) ions.
The process of muscle cell contraction is facilitated by proteins called voltage-gated ion channels. These channels open and close in response to changes in the electrical potential across the cell membrane. When a muscle cell is stimulated, voltage-gated sodium channels open, allowing a rapid influx of sodium ions into the cell. This results in a depolarization of the cell membrane and triggers the release of another protein, called the sarcoplasmic reticulum, which releases calcium ions (Ca2+) into the cytoplasm.
Calcium ions then bind to another protein, called troponin, which is located on the actin filaments. This binding causes a conformational change in troponin that exposes the active site on the actin filament. Another protein, called myosin, can then bind to the active site on the actin filament, forming a cross-bridge. The energy generated by ATP hydrolysis causes the myosin head to pivot, pulling the actin filament toward the center of the sarcomere and causing contraction.
In summary, the molecules involved in muscle cell contraction include voltage-gated ion channels, sarcoplasmic reticulum, calcium ions, troponin, and myosin. These molecules work together to produce the movement of ions across the cell membrane and the resulting small electrical current that facilitates muscle cell contraction.
l of the following are true about a hematoma except one. which one is the exception? group of answer choices is always a result of poor technique. due to a torn vein or artery. will resorb on its own with time. can cause prolonged anesthesia.
"Always a result of poor technique" is not the correct statement regarding hematoma.
The correct option is option a.
Hematoma is basically defined as a collection or pool of blood which is present outside of the blood vessels. Usually, hematomas are caused as a result of an injury to the wall of a particular blood vessel causing the blood to seep out of the blood vessel and into the surrounding tissues.
A hematoma can result from an injury or tear to any type of blood vessel which can be artery, vein, or a small capillary. It can also resorb on its own with time. Hematoma can also end up causing prolonged anesthesia.
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what is cystic fibrosis transmembrane conductance regulator?
On several bodily surfaces, including surface of the lung, the CF transmembrane conductance regulation (CFTR) protein aids in maintaining the balance of salt and water.
What does the biology term transmembrane mean?protein transmembrane. (Biological science: cells) a protein unit with a membrane-exposed peptide bond on both sides. When separate protein complex members are exposed at opposing surfaces, the expression is inapplicable. Integral membrane proteins make up the majority of integral membrane proteins.
Which organic molecules are involved in the membrane?The presence of subunit and tryptophans near the watery interface is a feature of many cross proteins [15]. These amino acids operate as border anchors that may connect with both the aqueous external and the hydrophobic interior of the barrier at the same time.
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what would be the fate of r7 differentiation in a fly with an inactive sevenless receptor and a constitutively active ras in the progenitor r7 cell?True or False
fate of r7 differentiation in a fly with an inactive sevenless receptor and a constitutively active ras in the progenitor r7 cell is false.
It would be unexpected what would happen to R7 differentiation in a fly with an inactive Sevenless receptor and a constitutively active Ras in the progenitor R7 cell.
The Sevenless receptor is normally activated by its ligand, which sets off a series of signaling events that cause the Ras protein to become active. The production of downstream genes involved in cell differentiation and proliferation is thus promoted by activated Ras.
The Sevenless receptor, however, needs to be active in order to bind to its ligand and activate Ras. Ras, on the other hand, will always be activated if it is constitutively active, regardless of the Sevenless receptor. This can cause downstream genes to get activated at the wrong periods, which could result in differentiation.
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