It is true that RNA catalysis can be selected in laboratory experiments. Because it can act like an enzyme for the experiments.
Several biological processes, including RNA processing and protein synthesis, are facilitated by catalytic RNAs. The hypothesis of an "RNA world," in which RNA was used as the starting point for life, was supported by the discovery of catalytic RNA. The fact that nucleic acid can act as an enzyme may seem remarkable. Only a small portion of a protein's chemical space is taken up by its components. However, mechanistic chemists face the challenge of explaining how ribozymes can accelerate reactions by a million times or more.
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Sensory or nerves carry information to the brain and spinal cord. T/F
the branch-like fibers extending in clusters from the neuron’s cell body are called ________.
Dendrites are the structures that come from the neuron and are branch-like structures. Thus the correct answer is option B.
Each neuron has a cell body, or soma, that contains a nucleus, smooth and rough endoplasmic reticulum, Golgi apparatus, mitochondria, and other cellular components, just like other cells do. Additionally, the layouts of neurons are distinct for both receiving and transmitting the electrical signals necessary for brain communication. At specialized connections known as synapses, dendrites, which are tree-like projections that extend from the cell body, receive messages from other neurons. Some types of neurons have numerous dendrites, despite the fact that some neurons have no dendrites at all. Dendritic spines, minuscule protrusions that increase the surface area for potential synaptic connections, may be present on dendrites.
The complete question is:
The branchlike fibers extending in clusters from the neuron s cell body are called __________.
a. glial fibers
b. dendrites
c. terminal buttons
d. axons
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which part of the fluorescence microscope will you adjust to direct the appropriate excitation wavelengths at your specimen?
Dichromatic beamsplitters are placed at a 45-degree angle to the optical block's path as the excitation light enters through the fluorescence illuminator using reflected light. Their main job is to re-direct the chosen excitation wavelengths onto the specimen through the objective.
The fluorophores in the specimen absorb light at a certain wavelength (or wavelengths), which causes them to emit light at a longer wavelength (i.e., of a different colour than the absorbed light). A spectral emission filter is used to separate the illumination light from the relatively weaker fluorescence that is released. A light source (often a xenon arc lamp or mercury vapour lamp, though more modern versions use high-power LEDs and lasers), an excitation filter, a dichroic mirror (or dichroic beamsplitter), and an emission filter are typical parts of a fluorescence microscope (see figure below). The spectral excitation and emission properties of the fluorophore employed to label the specimen are taken into account while selecting the filters and the dichroic beamsplitter.
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high blood pressure can have what effect on your eyes?
High blood pressure, also known as hypertension, can have a number of negative effects on the eyes.
Chronic high blood pressure can cause damage to the blood vessels in the eyes, leading to conditions such as retinopathy, which can cause vision loss, blindness, or even complete detachment of the retina. Hypertension can also increase the risk of developing cataracts, which are clouding of the lens in the eye. High blood pressure can also increase the risk of developing glaucoma, a condition in which damage to the optic nerve leads to vision loss. To protect their eyes and maintain good vision, people with high blood pressure should work with their healthcare provider to manage their condition and monitor their eye health regularly.
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What organ is responsible for producing most of the plasma proteins known as the complement system?O liverO heartO kidneyO spleen
Answer: Liver
Explanation:
Tay-Sachs occurs when a lysosome cannot clean up damaged cellular debris. This leads to a breakdown of which type of cells?
Tay-Sachs is an inherited disorder that mainly occur when the lysosome , a part of the cells which is responsible for cleaning up the damaged cellular debris.
Fails to serve duly. This leads to a buildup of a adipose substance called GM2 ganglioside in whim-whams cells. GM2 ganglioside is typically broken down and removed from the cells by the lysosome, but in Tay- Sachs, this doesn't be and the GM2 ganglioside accumulates in the cells,
ultimately killing them. This leads to the breakdown of whim-whams cells, particularly in the brain and spinal cord, performing in progressive physical and internal deterioration. As the whim-whams cells continue to accumulate GM2 ganglioside, the inpatient’s physical and internal condition worsens until death.
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which is a function of the golgi apparatus? which is a function of the golgi apparatus? cell respiration protein modification digestion of organic matter inside the cell
The correct answers for Golgi apparatus are: Protein modification; Carbohydrate modification.
The Golgi apparatus performs a number of tasks, such as:
Protein modification: Proteins are modified, sorted, and packaged into vesicles by the Golgi apparatus before being transported to their final location inside or outside the cell.
Modification of carbohydrates: The Golgi apparatus is also engaged in the glycosylation process, which involves the addition of sugar molecules to carbohydrates.
The Golgi apparatus is not involved in cell respiration or digestion of organic matter inside the cell. These processes occur in other cellular organelles, such as the mitochondria and lysosomes, respectively.
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Introduction of chemical, physical, or biological agents into water is called: ___________
Water pollution is the introduction of substances into water that are chemical, physical, or biological and reduce its quality and an organism's ability to survive.
The main causes are the expansion of industry and the human population. People need to be aware of its causes in order to prevent it. contaminants that seep into groundwater from contaminated surface water, as well as from septic tanks and underground gasoline and oil storage tanks. Because it seeps through rocks and sand and the pollutants can stick to the rocks and sand, it is challenging to make it clean again. pollution that comes from a single source is defined as recognizable and traceable to its source Enforcing cleanup can be challenging. Sources: Septic tank systems with leaks leaks from underground fuel or chemical storage tanks (ex. gasoline) oil tanker with a leak water tainted by active and inactive mines water that industries release Industrial and public wastewater treatment facilities
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what are the energy-producing (caloric) and non-energy-producing (noncaloric) nutrients? what are their primary functions in your body?
Calories are produced when an energy-producing substance is digested by the body. Non-Energy-Producing: Do not produce Calories but serve other functions. Non-Energy-Producing-Nutrients Are devoid of calories. Water, vitamins and minerals (macronutrients).
Food value is measured in calories per gram. A calorie (small c) is the amount of heat necessary to increase the temperature of one gram of water by one degree Celsius (more specifically from 15oC to 16oC). The huge calories (with a capital C) or Kilocalarie are equivalent to 1000 calories.
What does it mean to be non-energy yielding?A non-nutrient energy-yielding chemical is a source of calories that is not a nutrition. Alcohol has 7 calories per gram, making it less energy dense than fat but more energy dense than carbs and protein.
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of the four horse ancestors indicated on the phylogeny as a, b, c, and d, which one would you predict would be able to thrive in both forest and grassland habitat?
The specific horse ancestor indicated on the phylogeny as "a, b, c, and d" does not provide enough information to determine which one would be able to thrive in both forest and grassland habitats. Here option E is the correct answer.
Phylogenies, or evolutionary trees, depict relationships among species based on their ancestry and common ancestry. However, without additional information about the ecology, behavior, and adaptations of the species, it is not possible to predict which ancestor would be able to thrive in both forest and grassland habitats.
To determine which horse ancestor would be able to thrive in both habitats, researchers would need to analyze a variety of factors, including the species' diet, behavior, anatomy, and genetics. For example, they might examine the types of vegetation present in the habitats and the species' ability to obtain food and water in those environments.
They might also look at the species' adaptations for movement, such as its hooves, legs, and size, and how these adaptations might affect its ability to traverse different types of terrain.
Complete question:
Which of the following horse ancestors, indicated as a, b, c, and d on the phylogeny, would you predict would be able to thrive in both forest and grassland habitats?
A. Ancestor a
B. Ancestor b
C. Ancestor c
D. Ancestor d
E. Insufficient information to determine
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how do transposable elements contribute to genome evolution?
The transposable elements contribute to genome evolution by altering the cell's genotype with creation or reversion of mutations.
Genome evolution is the procedure through which a genome evolves over time, changing in size or in structure (sequence). Genome structure analysis, the study of genomic parasites, gene and ancient genome duplications, polyploidy, and comparative genomics are a few of the topics that are involved in the research of genome evolution.
An modification to a cell's chromosomes or genes is referred to as a mutation. The structure and growth of the progeny could be impacted by this change in the gametes. In biology, a mutation is a modification to a virus's nucleic acid sequence, extrachromosomal DNA, or an organism's genome.
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describe the process of dna replication. use terms such as okazaki fragments, dna ligase, dna polymerase, rna primer, and dna helicase in your answer.
DNA replication is a semiconservative process in which a single parental strand of DNA is used to synthesize a complementary strand using an enzyme called DNA polymerase.
When a cell divides, the DNA polymerases, an enzyme group, copy the lengthy strands of DNA that contain the genetic material of the cell. Every DNA strand creates a template that the DNA polymerases employ to create a complimentary strand. At the replication fork, one strand (the leading strand) is constantly synthesised in the 5′ to 3′ direction, whilst the second strand (the lagging strand) is intermittently synthesised in the 3′ to 5′ direction in brief pieces known as Okazaki fragments.
Okazaki fragments are the brief DNA segments created by the lagging strand's intermittent replication. The enzyme, DNA ligase is used to join these small fragments together so as a synthesize a daughter strand of DNA.
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the amount of testosterone and sperm produced by the testes is dependent on the influence of fsh alone. true or false?
The given statement "the amount of testosterone and sperm produced by the testes is dependent on the influence of FSH alone" is true because oxytocin combines with enzymes in semen to enhance sperm motility.
In humans, testosterone is essential for the growth of the testes and prostate, as well as for the promotion of secondary sexual traits including increased bone and muscle mass and the development of body hair. Testosterone is made by the testicles. During foetal development, testosterone activates the development of the male internal and external reproductive organs.
The influence of FSH alone determines how much testosterone and sperm the testes generate. When a couple is experiencing trouble conceiving, it is important to look at the male's sperm. Oxytocin, a hormone, and semen enzymes work together to improve sperm motility.
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what clinical manifestations are expected in the course of altered cellular proliferation and differentiation?
It is suggested that a number of diseases, including as cancer, atherosclerosis, rheumatoid, psoriasis, idiopathic pulmonary fibrosis, and cirrhosis of the liver, are mostly caused by excessive cell proliferation and cellular matrix turnover.
The process of increasing the number of cells is called cell proliferation. Contrarily, cell differentiation is the process of creating several cell types that develop into tissues and organs with particular roles within the body. multiplication of stem cells.
When stem cells divide, one daughter cell stays a stem cell while the other develops (e.g., to an intestinal epithelial cell). Blood cell differentiation serves as a good illustration of stem cells proliferating continuously.
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Conclusion Questions:
1. Estrogen levels are highest on day number?
21
21
7
my
2. LH levels are highest on day number?
12
3. How does the increase in the estrogen level correspond to the change in thickness of the
uterine lining in days 1 through 10 of the menstrual cycle?
The following are the answers:
By day 10, the estrogen levels are at their highest.LH levels are highest during ovulation, typically around day 14 of a 28-day menstrual cycle.The increase in estrogen level stimulates the growth and thickening of the endometrial lining, preparing it for possible implantation of a fertilized egg. If no pregnancy occurs, the drop in estrogen and progesterone levels triggers the shedding of the endometrial lining, resulting in menstrual bleeding.What is menstrual cycle?The menstrual cycle is a regular series of physiological changes in a female's reproductive system that occurs approximately every 28 days. It includes the release of an egg from the ovary, the thickening of the uterine lining in preparation for pregnancy, and the shedding of the endometrial lining if pregnancy does not occur.
The cycle is regulated by hormones produced by the hypothalamus, pituitary gland, and ovaries.
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if a hospital dumps its biohazardous waste into the ocean and it pollutes the neighboring state, this is an example of:
An example of a negative externality is when a hospital dumps its biohazardous waste into the ocean, polluting the state next door.
When people pay a percentage of the cost of producing a good without having any say in the corresponding production decisions, this is known as a negative externality.
Air pollution, Factory emissions of toxic gases, water pollution, and livestock production are all potential sources of the air pollution.
Light pollution is an example of an externality since people who utilize street lighting have an impact on people who are passing by that is not the offset by them.
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Chyme passes through the _____, a sphincter that connects the ileum with the ascending colon.
Chyme passes through the ileocecal valve, a sphincter that connects the ileum with the ascending colon.
What is an ileocecal valve?Ileocecal valve syndrome is a condition in which waste or undigested food flows backward from the large intestine to the small intestine.
The Ileocecal valve syndrome causes lower stomach pain as well as problems with poor breath and nausea. This is easily addressed by massaging the affected area under the supervision of a skilled therapist.
Its principal role is to manage the flow of digested food when it is time for it to exit the small intestine and be appropriately moved onto the big intestine.
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both height and eye color in this family follow a pattern consistent with blending inheritance. a. true b. false
Both height and eye color in this family follow a pattern consistent with blending inheritance. The given statement here is FALSE.
Blending inheritance is defined as the expression in offspring consisting of phenotypic characters that are intermediate between those of the parents. For example, pink flower color from red and white parental plants.The main difference between blending and particulate inheritance is that in particulate inheritance the offspring is a result of combination of the parents,while in blending inheritance the offspring is a result of blending of both the parents. Blending inheritance is not true because blending inheritance ultimately results in homologous populations full of intermediate genotypes, and it also fails to explain how genetic variation can persist over evolutionary time.
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select the most complete explanation of what the ph scale actually measures.
The ph scale actually measures the amount of hydrogen ions in a solution. Here option A is the correct answer.
The acidity or basicity (alkalinity) of a solution is gauged using the pH scale. It accomplishes this by determining the amount of hydrogen ions (H+) present in the solution.
The pH scale ranges from 0 to 14, with a pH of 7 being neutral, less than 7 being acidic, and greater than 7 being basic. The pH of a solution can have a significant impact on living organisms and their ability to function, as well as chemical reactions that take place in the solution.
An understanding of pH is crucial in fields such as biology, chemistry, environmental science, and medicine.
Complete question:
Select the most complete explanation of what the ph scale actually measures.
A) The amount of hydrogen ions in a solution
B) The concentration of water in a solution
C) The acidity or basicity of a solution
D) The temperature of a solution.
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Most of the digestible carbohydrates in our diets are broken down to _____, then provide a primary source of _____, spare protein from use as an energy source, and prevent _____.
Most of the digestible carbohydrates in our diets are broken down to glucose then provide a primary source of energy spare protein from use as an energy source, and prevent ketosis.
Carbohydrates are basically the primary source of energy which are obtained through the human diet. Different forms of sugar like fructose and glucose are categorized as simple carbohydrates. Our body breaks down these carbohydrates to form such simple sugars like glucose. Glucose or we can say blood sugar, is the principle source of energy for the cells and the tissues present in our body.
They are very small molecules and so they can be easily broken down and then absorbed by the body very quickly and are therefore the quickest source of energy. This done to prevent ketosis which is basically a metabolic state which occurs when our body starts burning fat for energy instead of glucose.
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what component of the selective medium allows for screening of effective transformation regardless of whether or not chdna fragments were inserted into the vector?
The component of the selective medium that allows for screening of effective transformation regardless of whether or not DNA fragments were inserted into the vector is the antibiotic resistance gene.
This gene is often included as part of the transformation vector and confers resistance to a specific antibiotic, such as kanamycin, ampicillin, or tetracycline. After transformation, the transformed cells are plated onto a selective medium that contains the antibiotic.
Only cells that have taken up the transformation vector will be able to grow on the selective medium, as they will have the antibiotic resistance gene. If a DNA fragment was not inserted into the vector, the cells will still contain the antibiotic resistance gene, allowing for the selection of the transformed cells.
On the other hand, if a DNA fragment was inserted into the vector, the cells will not only have the antibiotic resistance gene but will also express the inserted fragment. This allows for effective screening of successful transformation, regardless of whether a DNA fragment was inserted or not.
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macrophages are motile cells that crawl within tissues of the cells. hepatocytes are stationary cells that are anchored in place within the tissue. compared to hepatocytes, macrophages would likely have more of which cytoskeletal filament?
Compared to hepatocytes, macrophages would likely have more actin filaments.
Actin filaments (F-actin) are linear polymers of globular actin (G-actin) subunits that are found in muscle and non-muscle cells as thin filaments that are a component of the contractile apparatus (see contractile bundles).
Actin filaments are particularly prevalent below the plasma membrane, where they organize into a network that supports the cell mechanically, controls the shape of the cell, and permits movement of the cell surface, allowing the cell to migrate, ingest particles, and divide. Similar actin proteins are assembled in a long spiral chain to form actin filaments.
Similar to microtubules, actin filaments have plus and minus ends, with the plus end of a filament exhibiting more ATP-powered growth.
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the study of small, single-celled prokaryotic organisms is called
Bacterial research is the study of these tiny, single-celled, prokaryotic organisms. Bacteriology. a field of microbiology that deals with identifying, putting bacterial species into categories, and characterizing them.
What does bacterium contain?The cell structure of bacteria is more straightforward than that of several other microorganisms. A single loop of DNA serves as their command center and houses all of their genetic information. Instead of a nucleus, some bacteria get a plasmid—an additional circular structure containing genetic material.
What does a bacterial illness entail?The skin, lungs, brain, blood, and other body organs can all be harmed by bacterial infections. One-celled organisms replicating or releasing toxins into your body are how you get them. UTIs, food poisoning, STIs, and several types of sinus, ear, and skin infections are among the common bacterial disorders.
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Let’s simulate a point mutation at the 24th base. It was accidentally changed during replication from a G to a C. Now transcribe this new DNA strand into mRNA, and then translate it into its amino acid sequence.
The new DNA strand will become, starting from the 7th base; AUG ACU CGA CUC GAC GUG UCG GCU CGA GGA CAC AUU UGA (24th base underlined). The amino acid sequence is; MET THR ARG LEU ASP VAL SER ALA ARG.
What is a point mutation?Point mutation is a genetic mutation caused by the substitution of one nucleotide for another. It is also known as substitution mutation.
A point mutation at the 24th base, changing G to C, will result in a change in the codon from GGA to CGA. This will result in a change of the amino acid from glycine to arginine. The mRNA transcript would be CGA and the resulting amino acid sequence would be arginine.
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visual examination of the bladder and urethra via a lighted cystoscope is called?
Cystoscopy is basically the procedure which is involves the visual examination of the bladder as well as the urethra via a lighted cystoscope.
A cystoscope is basically a long as well as thin optical instrument which has an eyepiece at one of its end, a rigid and flexible tube present in the middle, and also a tiny lens and light source present at the other end of the tube. A urologist first fills the bladder with the fluid and then looks at the detailed images of the urethra as well the linings of the bladder on a computer monitor.
A urologist performs this procedure in order to find the cause of, and sometimes also treat, urinary tract problems such as, urinary tract infections (UTIs), hematuria, urinary retention, urinary urgency, urinary frequency or urinary incontinence etc.
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The Haber Process involves nitrogen gas combining with hydrogen gas to produce ammonia.
N2 + 3H2 → 2NH3
10.0 grams of nitrogen gas is reacted with 10.0 grams of hydrogen gas.
Find the following: the molar mass of reactants and products, the limiting reactant, the excess reactant, the amount of ammonia produced.
Answer:
Molar masses:
Nitrogen gas (N2): 28.02 g/mol
Hydrogen gas (H2): 2.02 g/mol
Ammonia (NH3): 17.03 g/mol
The number of moles of N2 and H2 are:
N2: 10.0 g / 28.02 g/mol = 0.357 moles
H2: 10.0 g / 2.02 g/mol = 4.95 moles
Since 3 moles of H2 are required for every mole of N2, H2 is the limiting reactant and N2 is the excess reactant.
The amount of ammonia produced can be calculated using the limiting reactant:
0.357 moles N2 * 2 moles NH3/1 mole N2 = 0.714 moles NH3
0.714 moles NH3 * 17.03 g/mol = 12.28 g NH3.
Therefore, 10.0 grams of nitrogen gas reacts with 10.0 grams of hydrogen gas to produce 12.28 grams of ammonia.
Do cells in different tissue have different dna within the same organism?
Answer:
No
Explanation:
All your cells in the body have same DNA. The difference comes from how we control the expression of different genes in those tissues. There's a reason you can't hear with your heart or your ears dont beat, its because the tissue in that region of body expresses some gene and blocks others. This creates the diversity in tissues we see in humans and entire living organism spectrum.
In conclusion, no every part of body has same DNA, the difference comes from how we control the signalling and expression of certain genes.
a robertsonian translocation occurs when two chromosomes lose their short arms and fuse to form a large single chromosome. select one or more: a. nonhomologous acrocentric b. homologous telocentric c. homologous acrocentric d. nonhomologous telocentric
A robertsonian translocation occurs when two chromosomes lose their short arms and fuse to form a large single chromosome which is homologous acrocentric.
When one type of chromosome joins another, the process is known as a Robertsonian translocation (ROB). It is the most prevalent kind of chromosomal translocation in humans, affecting 1 in 1,000 infants. Health issues are uncommon, but on occasion they might lead to genetic diseases including Patau syndrome and Down syndrome. Chromosome numbers are decreased as a result of Robertsonian translocation.
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In terms of mechanism, recessive traits are usually....
A. Non-functional versions of the normal 'wildtype' protein or enzyme.
B. Only expressed in the 'phenotype' when two such (recessive) alleles are present.
C. An example of dominant-negative mutations.
D. Present in the population-mostly in carriers (heterozygous individuals)
In terms of mechanism, recessive traits are usually examples of dominant-negative mutations.
Mutations are changes in the DNA sequence caused by DNA copy mistakes or by environmental influences such as UV light or cigarette smoke. An individual inherits her two versions of each gene, known as alleles, from each parent. For recessive traits, the alleles of the gene causing the trait are the same and both (recessive) alleles must be present for the trait to be expressed. A recessive allele produces no trait at all when only one copy is present. In terms of mechanism, recessive traits are usually examples of dominant-negative mutations.
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the human protein transferrin sequesters iron from bacteria. transferrin attempts to interfere with which fundamental attribute of a successful pathogen?
The human protein transferrin sequesters iron from bacteria, attempting to interfere with the bacteria's ability to acquire iron, a fundamental attribute of a successful pathogen.
Iron is an essential nutrient for the growth and survival of most bacteria, and many pathogens have evolved specialized mechanisms for obtaining iron from their host.
By binding iron, transferrin interferes with the bacteria's ability to utilize this essential nutrient, potentially limiting its growth and virulence. This highlights the importance of iron acquisition for bacterial survival and the potential for transferrin to serve as a target for anti-bacterial strategies.
Iron is required for all physiological processes in bacteria and fungus, including DNA replication, metabolism, transcription, and energy production during respiration. Pathogenic bacteria and fungi have developed sophisticated methods to get iron from host sources.
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