Option 1 is Correct. A method used to help restore cod populations is to limit fishing fleet size and catch amounts.
Atlantic cod, a fish that was crucial to New England's economy, is now being fished at historically low levels, and after many years of overfishing, New England cod appears to be recovering. Since the IUCN has listed species like cod, haddock, and grouper as endangered, many people are wary about eating fish.
Another concern for divers is the fish that are associated with high bycatch rates. At this location, dolphins and turtles are unintentionally killed in the nets. Limiting the size of fishing fleets and captures is the method used to aid in the restoration of cod populations.
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Correct Question:
Which choice describes a strategy used to help restore cod populations?
1. limit the size of fishing fleets and catches
2. restrict fishing to trawling nets
3. allow fishermen to harvest from protected areas when necessary
4. harvest only very young fish
A chemical reaction is represented by the following unbalanced chemical equation
Na2(aq) + HCl(aq) → NaCl(aq) + H2S(g)
Which statement best describes why it is necessary to balance all chemical equations?
A. Chemical reactions do not destroy matter, so the same number of atoms must be present before and after the reaction.
B. Chemical reactions make new substances, so the new elements must be accounted for.
C. The total number of atoms in a chemical reaction are relative, so you can add as many as you want.
D.The total number of atoms in a chemical reaction can change as the reaction proceeds, so they must be identified first.
Reaction equations are balanced in order to obey the law of conservation of mass. This law states that in a closed system, matter cannot be created or destroyed, i.e., it must remain the same. Therefore, the correct statement is A.
Why is it necessary to balance the given chemical equation?
A chemical equation should always be balanced because the law of conservation of mass states that matter can neither be created nor destroyed so in a chemical equation the total mass of reactants must be equal to the mass of products formed i.e. the total number of atoms of each element should be equal on both the sides of a chemical equation.
Which law best explains why chemical equations should be balanced?
Chemical equations must be balanced to satisfy the law of conservation of matter, which states that matter cannot be produced or destroyed in a closed system.
Which statement best describes balancing equations and the law of conservation of mass?
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
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During which stage of meiosis would you find a cell with a diploid chromosome number and recombinant chromosomes?
what is one way in which a cellular slime mold differs from a plasmodial slime mold?
Cellular slime molds and plasmodial slime molds are two distinct groups of organisms that belong to the phylum Myxomycota. One way in which they differ is in their form of multicellularity.
A cellular slime mold is composed of individual amoeba-like cells that come together to form a multicellular structure, called a pseudoplasmodium, in response to environmental stress, such as a lack of food.
The cells aggregate to form a mass that moves as a single entity and eventually forms a fruiting body, which produces spores that will eventually give rise to new amoeba-like cells.
On the other hand, plasmodial slime molds are characterized by a true multicellular stage, called the plasmodium, which is a large, amorphous, and undifferentiated mass of cytoplasm that contains many nuclei and moves as a single entity.
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QuestionRobert Hooke was the first scientist who coined the term ‘cell’. Which cell did he observe under the microscope?AFiberBCorkCRootDLeaf
Robert Hooke was the first scientist who coined the term ‘cell’.Cork is the cell he observe under the microscope.
He observed and described cells in a thin slice of cork, which he compared to a honeycomb, and thus coined the term “cell”. He was the first to note the presence of pores in cork cells, which were later determined to be holes for gas exchange.Cork is a natural, renewable material made from the bark of the cork oak tree. It is light, waterproof, fire-resistant, sound-insulating and buoyant, making it a great material for a variety of uses. Cork is used to make products such as flooring, insulation, sealing, gaskets, wine stoppers, and more.
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complete question:Robert Hooke was the first scientist who coined the term ‘cell’. Which cell did he observe under the microscope?
A)Fiber
B)Cork
C)Root
D)Leaf
the anterior pituitary gland secretes , which stimulates the formation of .
The anterior pituitary gland secretes FSH (Follicle Stimulating Hormone) which stimulates the formation of follicles in the ovaries for females and the maturation of sperm for males.
The anterior pituitary gland is located at the base of brain. It is an endocrine gland which is responsible for the production and secretion of various hormones such as FSH.
FSH stimulates the development and growth of follicles in the ovaries for women. The stimulation of FSH is a very important part of ovulation and this results the release of mature egg from ovary.
For males FSH acts on the maturation of sperms in the testis. For healthy, motile, fertile sperms, FSH carries a major role. Without the enough amount of FSH sperm stimulation and production thus count of sperms can be low.
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explain how new discoveries in genetics enabled scientists to expand on darwin's theory of evolution in the twenty-first century.
How new discoveries in genetics enabled scientists to expand on darwin's theory of evolution in the twenty-first century.
In the 21st century, advances in genetics have allowed scientists to expand upon Darwin's theory of evolution by providing new insights into the mechanisms of evolution. For example, genetic research has revealed the role of mutations, genetic drift, and gene flow in shaping the genetic makeup of populations over time. It has also shed light on the processes of speciation and the origin of new species. Additionally, studies of the human genome and other genomes have provided evidence for common ancestry and shown how evolution has shaped the development and diversity of life on earth. These new discoveries in genetics have enhanced our understanding of evolution and how it has shaped the natural world.
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true or false: a disease with a genetic origin in a mouse is unlikely to be an inherited disease in humans.
The answer is False. The statement "a disease with a genetic origin in a mouse is unlikely to be an inherited disease in humans" is false.
The given statement is not true due to evolutionary relatedness, humans share many genetic similarities with animals. Humans share many genetic similarities to animals, which means that a genetic disease in mice can also be an inherited disease in humans.
An example of a disease that may be inherited from mice SARS-CoV is which caused a severe outbreak of respiratory diseases in Hong Kong in 2003. This virus was thought to be related to the mouse-borne coronavirus, which also caused a major outbreak of respiratory disease in 2003.
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explain why it is that we do not observe a perfectly linear relationship between map units and recombination frequency.
The recombinant frequency of one percent is used as the definition for the map unit.
When two genes are found on the same chromosome, the amount of space that separates them affects the likelihood that a crossover will result in recombination between the genes.
The greater the physical distance that exists between two genes, the lower the probability that those genes would combine during any particular meiotic event. Regardless of the distance between the loci, the recombinant frequency in a dihybrid never goes above 50 percent for connected loci.
A frequency of recombination of fifty percent suggests that the genes arrange themselves in an autonomous fashion. Because of this, we do not observe a relationship that is perfectly linear between the number of map units and the frequency of recombination.
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How is a neural impulse generated and transmitted from one neuron to another?
➤Neural impulses are electrochemical events. When a neuron is stimulated beyond a threshold level, there is a rapid shift in its polarity from a negative to a positive charge. This reversal of charge, called an action potential or neural impulse, is generated along the length of the axon to the terminal buttons.
➤When a neural impulse reaches the terminal buttons, it triggers the release of neurotransmitters, the chemical messengers that carry the message across the synapse to neighboring neurons. Neurotransmitters can have either excitatory or inhibitory effects on the neurons at which they dock.
A neural impulse, also known as an action potential, is generated and transmitted from one neuron to another through the following steps: Depolarization, Propagation, Threshold and Synaptic Transmission.
What happens during Depolarization?When a stimulus, such as a chemical messenger from another neuron, reaches the dendrites of a neuron, it causes the inside of the neuron to become more positively charged, a process known as depolarization.
What happens during synaptic transmission?At the end of the axon, the action potential triggers the release of chemical messengers, called neurotransmitters, into the synaptic cleft. These neurotransmitters bind to receptors on the dendrites of the next neuron, causing depolarization and triggering another action potential.
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The largest unit within which gene flow can readily occur is a?
A species is the biggest unit within which gene flow is most likely to take place.
Gene flow is the movement of genes from one group to another. Numerous factors have an effect on the gene flow. The largest population unit where easy gene flow is possible is a biological species. Within a species, effective interbreeding results in fruitful reproduction and, ultimately, gene flow. The basic unit of classification, taxonomic rank, and biodiversity for an organism is its species. A species is the largest group of beings in which any two individuals of the appropriate sexes or mating types may create a live kid, often through sexual reproduction. The karyotype, DNA sequence, morphology, behaviour, or ecological niche can all be used to identify a species.
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complete question:The largest unit within which gene flow can readily occur is ________.
A) a population
B) a species
C) the entire range of a genus
D) the hybrid zone
natural selection can only act on traits that: are heritable. are dominant. are acquired in an individual's lifetime. confer a reproductive advantage. are adaptive.
Natural selection is the process through which heritable beneficial qualities grow more prevalent in succeeding generations of a population of reproducing organisms, while heritable negative traits become less common.
Natural selection operates on an organism's phenotype, or visible traits, so that individuals with favorable phenotypes are more likely to survive and reproduce than those with less desirable phenotypes.
If these characteristics have a genetic foundation, the genotype linked with the favorable phenotype will become more common in the following generation. This process can result in adaptations that specialize animals for certain ecological niches over time, and it may eventually result in the development of new species.
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which among a - c is false regarding endotoxin? a. it is found only in gram-negative bacteria b. the effect of endotoxin only occurs if the endotoxin-containing cells die and lyse. c. endotoxin is found in the inner (cytoplasmic) membrane d. none are false; a, b, and c are all correct
The incorrect regarding endotoxin is the effect of endotoxin only occurs if the endotoxin-containing cells die and lyse, because endotoxin is a lipopolysaccharide component of the Gram-negative bacteria cell and is released during active cellular growth and after cell lysis.
Thus, the correct answer is B.
Endotoxins аre the mаin component of the outer membrаne of the cell wаll of Grаm-negаtive bаcteriа. Typicаlly, the term endotoxin is used synonymously with lipopolysаcchаride (LPS), despite the fаct thаt а few endotoxins аre not LPS. The mаin function of endotoxins in bаcteriа is structurаl аnd protective.
Grаm-negаtive bаcteriа аre chаrаcterised by two membrаnes: the inner membrаne surrounds the cytoplаsmа whereаs the outer membrаne sepаrаtes the bаcteriаl cell wаll from the externаl environment. Thus, the outer membrаne serves аs the first line of defence аgаinst environmentаl threаts. In most cаses, the outer membrаne is not а common phospholipid bilаyer but аn аsymmetric bilаyer comprising LPS in the outer lаyer аnd phospholipids in the inner one
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seeing, hearing, and feeling are all examples of what process?
what characteristics of chlamydomonas are typical of protists in general?
The characteristics of chlamydomonas which are typical of protists in general are that it possesses a cup-shaped chloroplast and a photoreceptive eyespot at the chloroplast.
Chlamydomonas is a Protista member. It was classified with chlorella in older categorization schemes underneath the Plantae family and the subgroup Algae, mostly because both have cell walls. It is a plant-animal that is still descended from the two kingdoms' ultimate common ancestor. For many years, the green yeast has lived in laboratories. It has interesting morphology and habits and is simple to grow in liquid cultures.
Chloroplast is a plastid made up of chlorophyll, a green pigment. As a result, the chloroplast is the cell organelle that is referred to as the kitchen of the cell. This pigment aids the cells in producing their own food through the process of photosynthesis.
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which condition is caused by the increased plasminogen activator inhibitor 1 (pai-1) and fibrinogen often present in metabolic syndrome?
Select all of the characteristics exhibited by BOTH bacterial and eukaryotic cytoplasmic membranes.1. Phospholipid bilayer2. Embedded proteins3. Sterols4. Selectively permeable barrier5. Transport systems
Phospholipid bilayer
Embedded proteins
Transport systems
What are bacterial and eukaryotic cytoplasmic membranes?
A phospholipid bilayer makes up the cytoplasmic membranes of bacteria and eukaryotes, providing a barrier that is only selectively permeable. Proteins that perform a variety of tasks, including functioning as transporters, enzymes, and signaling molecules, are also embedded in both types of membranes. Additionally, the cytoplasmic membranes of eukaryotic and bacterial cells also feature transport mechanisms that control how ions and other molecules enter and exit the cell.
Bacterial cytoplasmic membranes do not contain sterols. They are only found in the cytoplasmic membranes of eukaryotes, where they help the membrane to remain stable and fluid.
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What is the half bird half-human creature in Greek mythology?
the cytoskeletal component that forms near the nucleus that extends outward toward the plasma membrane is:
The cytoskeletal component that forms near the nucleus that extends outward toward the plasma membrane is Microtubule.
Microtubules, incredibly slender tubes made of tubulin protein subunits, are a vital aspect of the cytoskeleton in eukaryotic cells. They give the cell its shape and stability while organizing cellular components and enabling cell division.
These dynamic structures are always in flux, building and breaking down in response to cellular signals. Not only do they play a critical role in maintaining cell shape, but they also serve as pathways for the movement of vesicles, organelles, and other substances within the cell.
In addition, microtubules help distribute chromosomes during cell division. Any disruptions in the microtubule network can lead to severe cellular malfunctions and various diseases.
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the bilateral structure in the thalamus that relays information from the optic nerve to the visual cortex is known as the .
The lateral geniculate nucleus (LGN) is the name of the bilateral thalamic structure that transmits information from the optic nerve to the visual cortex.
The LGN is a critical part of the visual pathway, as it serves as the main point of convergence for visual information from the eyes before it is sent to the visual cortex for further processing.
The LGN is organized into distinct layers, with each layer receiving input from one eye and sending output to the visual cortex. This allows the LGN to perform some basic processing of the visual information, such as analyzing the spatial and temporal relationships between different visual stimuli.
The LGN also plays a role in the perception of color and contrast, and it is thought to contribute to the perception of depth and three-dimensional objects.
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5.03 Primate EvolutionSkull Analysis [help me pls let me use work]Lab Report
Instructions: As you complete each slide of the Skull Analysis Virtual Lab Activity, please fill in this lab report with the appropriate information and data.
Title:
Objective(s):
Hypothesis:
Variables:
Materials:
Skull casts: 4 known species and 1 unknown
Calipers
Procedures:
Qualitative Observations:
Line up each of the skulls on the lab table, facing to the left, with the Frankfurt planes parallel to the ground.
Observe each skull from the side, recording your observations about the following features (use the table below to record your observations):
Forehead: Is the angle of the forehead sloping or more vertical? Is the brow ridge above the eyes small, medium, or large? Does the forehead extend out above the eyes?
Face: Is the shape of the face sloped or flattened and vertical?
Teeth: Are the teeth long or short? Sharp or dull?
Observe each skull from the bottom view and locate the foramen magnum. This is the hole that connects the brain stem to the spinal cord. Record your observation of the location of each skull’s foramen magnum. Is it located toward the front or the rear of the skull?
Observe each skull from the top and record your observations of the shape of the brain cavity. Is it more round or oval? Are the edges more squared off or pointed? Make comparisons between the skulls.
Quantitative Observations: Determine Supraorbital Height
Use the calipers to measure the distance AC (from point A to point C on the skull).
Use the calipers to measure the distance BC (from point B to point C on the skull).
These measurements will be used to calculate the skull’s supraorbital height index according to the formula: (BC/AC) × 100 = Supraorbital Height Index (note: The unit of measurement is SHI.)
Record the skull’s supraorbital height index in the data table.
Take the same measurements for each of the skulls, recording the supraorbital heights index in the data table.
Data and Observations:
Create a data table to record your observations and measurements for each skull:
Skull Forehead Face Teeth Foramen Magnum Brain Cavity Supraorbital Height (SHI)
Pan troglodytes (modern chimpanzee)
Homo sapiens
(modern human)
Homo erectus
(extinct hominid)
Australopithecus afarensis
(extinct hominid)
Unidentified Fossil Skull
Conclusion:
Be sure to answer the following reflection questions in the conclusion of your lab report:
Was your hypothesis correct? Which of the four species does the unidentified skull most resemble? Predict how you think it may relate to the other species in terms of evolution. Justify your answer with specific observations.
How do the shapes of the face, forehead, and teeth differ between the various species?
Questions:
Using what you have learned from the lesson and the virtual lab activity, answer the following questions in complete sentences:
What do you think accounts for these differences? How might some of these differences be possible adaptations?
In what way do you think the location of the foramen magnum relates to the movement of each species?
What might the shape of the skull and the supraorbital height tell us about each species?
The evidence of the skull can show the changes that have taken place in the species by evolution.
How do you use skull to determine the evolution of primates?The skull is a valuable tool in determining the evolution of primates because it provides information about the anatomy and behavior of an organism. By analyzing the shape, size, and structure of the skull, scientists can infer adaptations for specific ecological roles, such as foraging, grasping, and chewing.
Molecular data can be combined with anatomical data to create a more comprehensive understanding of primate evolution.
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Put the phases of the cardiac cycle in the correct order, starting after ventricular filling.A) ventricular ejection, ventricular relaxation, isovolumetric contractionB) ventricular ejection, isovolumetric contraction, isovolumetric relaxationC) isovolumetric relaxation, ventricular ejection, isovolumetric contractionD) isovolumetric contraction, ventricular ejection, isovolumetric relaxation
The cardiac cycle in the correct order, starting after ventricular filling are isovolumetric contraction, ventricular ejection, isovolumetric relaxation.
What stage of the cardiac cycle is this?The 2 thin-walled upper chambers of the heart are sequentially activated and contract during atrial systole, which starts the cardiac cycle. Atrial systole is followed by ventricular systole, which is the delayed contraction of the stronger lower chambers.
Which 5 components make up the cardiovascular system?The blood-vascular system or simply the circulatory system are other names for the cardiovascular system. It is made up of a muscular pumping organ called the heart and a closed system of blood channels called arteries, veins, and capillaries.
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Why do you think desert night lizards join family group? What advantages do you think they gain by living in a group?
Lizards known for their laying eggs and never looking back, desert night lizards have family values, like humans who have been found to invest time and energy in their young and families, a Tactics that were thought to be exclusive to mammals and birds.
What are Lizards?Lizard is a type of reptile which belongs to the order Squamata which also includes snakes, suborder Serpentine. Lizards are scaly reptiles that differ from snakes in having legs, movable eyelids, and external ear openings.
The desert night lizard is small in size with the average adult female at 80 mm in total length and 1.3 g in weight who lays eggs and leave with the family.
Thus, Lizards known for their laying eggs and never looking back, desert night lizards have family values, like humans who have been found to invest time and energy in their young and families, a Tactics that were thought to be exclusive to mammals and birds.
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The desert night lizard (Xanthusia vigilis), forms family social groups with mates, parents and offspring to protect themselves from enemies and look after each other. This is different from the behavior of lizards in general, which do not form social groups.
The desert night lizardDesert lizards usually prey on invertebrates, such as ants (including red ants), crickets, grasshoppers, beetles, worms, flies, ladybugs, worms, and some plant material. They are often found around ant hills, where they sit and wait for the ants to pass.
While some types of desert lizards will seek out areas of soft sand, they usually shake themselves vigorously, throwing sand over their backs and leaving only their heads. This allows them to hide from predators and wait for their unsuspecting prey.
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gonads containing hormone-secreting interstitial cells is called?
Gonads containing hormone-secreting interstitial cells is called Leydig (interstitial) cells.
In general ,Gonads are considered as the primary reproductive organs. They are known as testes in males and ovaries in females. Hormones like testosterone is secreted by the male reproductive organ. estrogens and progesterone are secreted by the female reproductive organ ovaries.
Leydig cells, generally considered as interstitial cells of the testes and interstitial cells of Leydig, they are present near to the seminiferous tubules in the testicle and assist in production of testosterone in the presence of luteinizing hormone (LH). Thus, Testosterone is usually secreted by cells that is present between the seminiferous tubules, also termed as the Leydig cells.
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Niches are dynamic, and are affected by interactions among species.a. trueb. false
It is a.True that Niches are dynamic, and are affected by interactions among species. an organism's contribution to a community is referred to as its "niche."
The physical and environmental conditions that a species needs, such as temperature or terrain, as well as the interactions it has with other species (such as predation or competition, are all included in its niche. The situation in which co-occurring species share a portion of their niche space with one another is referred to as "niche overlap." For some species, niche overlap may result in conflictual interactions like competition and exclusion (Giménez Gómez et al.). Relationships that benefit both parties can boost interactions between their populations. Additionally, the organisms have an impact on their surroundings, influencing ecosystem resources and the surface of the planet.
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during a portacaval shunt, what will the surgeon need to clamp the proximal and distal branches once the bifurcation of the right and left hepatic arteries and veins are identified and exposed with tapes?
During a portacaval shunt, the surgeon will need to clamp the proximal and distal branches once the bifurcation of the right and left hepatic arteries and veins are identified and exposed with tapes debakey ring bulldog clamp.
Portаcаvаl shunting is а surgicаl treаtment to creаte new connections between two blood vessels in the аbdomen. It is used to treаt people who hаve severe liver problems.
Portаcаvаl shunting is mаjor surgery. It involves а lаrge cut (incision) in the belly аreа (аbdomen). The surgeon then mаkes а connection between the portаl vein (which supplies most of the liver's blood) аnd the inferior venа cаvа (the vein thаt drаins blood from most of the lower pаrt of the body). To make the connection, the surgeon will need the ring hаndles debаkey bulldog clаmps аre used to ceаse flood flow during cаrdiothorаcic procedures.
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a dominant allele p causes the production purple pigment; pp individuals are white. a dominant allele c is also required for color production; cc individuals are white. the c locus has an epistatic effect on the p locus. what proportion of offspring will be white from a ppcc x ppcc cross?
3/8 proportion of offspring will be white from a ppcc x ppcc cross.
An allele is a variant of the same sequence of nucleotides at the same location on a long DNA molecule, as described in prominent genetics and evolution textbooks.
"A locus (plural: loci) is the chromosomal or genomic site of a gene or any other genetic element, and alleles are alternate DNA sequences at a locus."
Single nucleotide polymorphisms (SNPs) are the most basic alleles, but they may also be insertions and deletions of thousands of base pairs.
The term 'allele' is commonly used to refer to distinct alleles within genes. The ABO blood grouping, for example, is regulated by the ABO gene, which has six common alleles (variants). In population genetics, practically every living human has some combination of these six alleles for the ABO gene.
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Determined by both genotype and environment. Alleles of a gene are typically located at the same ______ on homologous chromosomes
Alleles of a gene are typically located at the alleles of same gene on homologous chromosomes.
Homologous chromosomes are the pair of chromosomes that have the same genes in the same order. Homologous chromosomes come in pair because one chromosome in the brace is inherited from the mama and the other from the father. The chromosomes in each brace are analogous,
But not identical. Homologous chromosomes are important for the accurate separation of inheritable material during cell division, specifically during meiosis. During meiosis, homologous chromosomes pair up and change inheritable material, which is known as recombination.
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The diaphragm creates a ________ section between the thoracic and abdominal body cavities.
The transverse (cross) portion here between thoracic and abdominal bodily chambers is created by the diaphragm.
Why does the diaphragm serve its purpose?You can blow in and out with the assistance of the diaphragm, a muscle This little muscles has a dome shape and is positioned behind your heart and lungs. It is joined to your backbone, the base of your rib cage, and the septum, a bone in the heart of your chest.
Do you have a diaphragm if you can take a breath?However, your diaphragm muscle, that performs the pushing and tugging on your lungs to enable them operate, is meaningless without your lungs. Therefore, when you inhale, your head transmits an electrical impulse to your breathing muscles through your neurological system.
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Replication is the synthesis of ______, while transcription is the synthesis of ______.
Replication is the synthesis of DNA whereas transcription is the synthesis of RNA.
In molecular biology, DNA replication is basically the biological process which involves the production of two identical replicas of DNA which are produced from one original or parent DNA molecule. DNA replication happens in all the living organisms and acts as the most essential part for biological inheritance.
Transcription is basically process which involves the copying of a particular segment of DNA into RNA. The segments of DNA get transcribed into RNA molecules which can encode proteins are said to produce the mRNA or the messenger RNA.
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Which factors can prevent permanent fixation of an allele (i.e. maintain genetic diversity)? -Mutation -Natural Selection -Gene Flow -Genetic Drift
The factors that can prevent permanent fixation of an allele (i.e. maintain genetic diversity) are genetic drift and natural selection (option 2 & 4)
Genetic drift is a shift in an organism's genetic makeup that improves its ability to adapt to its environment. Continuous change provides an added benefit and improves survival chances.
Natural selection is the process by which an organism adapts to its surroundings by comparatively replicating its genes.
The main causes of allele fixation are these two factors. Through the loss of alleles or genotypes, drift induces the fixation of alleles. For diploid species, drift produces an increase in homozygosity and the inbreeding coefficient.
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