An alimentary canal is a tube with openings at both ends, whereas a gastrovascular cavity only has one opening that serves as both an entrance and an exit.
The food we eat is broken down by the digestive system into small pieces so that we can use it as fuel and get the nutrients we need to live. Amino acids come from protein, simple sugars come from carbohydrates, and fatty acids and glycerol come from fats.
The cells that surround the digestive compartments in gastrovascular cavities only have one opening, which serves as both the entrance for food (similar to a mouth) and the exit for waste (similar to an anus). This method of digestion is utilized by Platyhelminthes (flatworms), Ctenophora (comb jellies), and Cnidaria (coral, jellyfish, and sea anemones).
The digestive tube known as the alimentary canal or digestive tract has two distinct openings: one at the mouth and the other at the anus. Food can be processed more effectively if it moves in only one direction. Earthworms are an illustration of a creature with an alimentary canal.
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which of these is genetically balanced as haploid gametes? note that the red and blue chromosomes are non-homologous. select all that apply.
Haploid gametes with homologous chromosomes have balanced genetic makeup.
What chromosomes have haploid DNA?Definition. A cell of an organism is said to be haploid if it only has one set of chromosomes. Diploic organisms are those that reproduce sexually (having two sets of chromosomes, one from each parent). In humans, only the sperm and egg cells are haploid.
A haploid gamete is what?Haploid refers to a cell containing one set of chromosomes. The number of chromosomes in gametes, which are also known as egg or sperm cells, is also referred to as haploid. Human gametes are haploid cells with 23 chromosomes, one of which is found in each of the chromosome pairs found in diplod cells.
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Is flea treatment every 4 weeks?.
Effective flea manipulation will suggest the use of a specific flea treatment (adulticide) every 4 weeks for as a minimum the three months, ideally on your puppy's lifestyle.
Fleas can nonetheless jump onto your pup in the iciness, and your warm domestic might be the proper surroundings for triggering flea eggs to hatch. So, in case you're asking your self “how often ought I deliver my puppy flea remedy?”, the solution is each 4 weeks for surest protection – 12 months round, leaving no gaps.
Commonplace symptoms of toxicity from flea merchandise containing organophosphates are diarrhea, vomiting, problem breathing, small scholars, muscle tremor, weakness or falling over, and drooling. Organophosphate toxicity may be swiftly deadly, relying on the components and dose the puppy is uncovered to.
The fastest options for killing fleas with prescription medicinal drugs are Comfortis or Trifexis, which also work as powerful preventative medicinal drugs. “both merchandises incorporates the active element spinosad, so as to start killing fleas within 30 minutes of consuming the pill.
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What are the 4 types of biological contamination?.
Biological contamination is defined as the contamination of food caused by microorganisms.
The microorganisms which cause contamination are called contaminants. The different types of contaminants are bacteria, fungi, parasite and virus. These are transferred to food through various sources such as people, raw food, pest and refuse.
Bacteria are single celled organisms which have a rigid cell wall. They cause spoilage and consuming food affected by them causes illness. Bacteria produces spores that help them survive in high temperature areas. They are difficult to multiply.
Viruses are microscopic pathogens which are smaller than bacteria which can multiply in living cells. They cannot reproduce on their own and hence require a host for the same. Parasites are organisms which live and feed on a host. In most cases it is a one way relationship where at the end the host dies.
Fungi are biological contaminants which are found naturally. They can be small single celled organisms or multicellular organisms. Examples are mould and yeast.
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which enzyme is involved in branch migration during recombination? group of answer choices ruva recb/c/d ruvc ssb reca
These enzymes, known as RuvAB, catalyse branch migration, which pairs two homologous DNA strands. Due to the DNA helicase activity of RuvAB, a crossover branch will migrate in a way that will prolong the DNA heteroduplex.
In multicellular animals, DNA recombinases are frequently utilized to modify genome structure and regulate gene expression. These bacterial- and fungal-derived enzymes (bacteriophages) catalyse DNA exchange events between short (30–40 nucleotide) target site sequences that are unique to each recombinase. Excision/insertion, inversion, translocation, and cassette exchange are four fundamental functional modules that are made possible by these events and have been utilized singly or in combination to control the expression of many different genes.
Hence, recombinase is enzyme brings up recombination of DNA.
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the aortic arches function as hearts, pumping blood through a closed circulatory system. therefore, which of the following are true statements about how blood travels in an earthworm? select all that apply.
The aortic arches perform heart-like functions. The five pairs of aortic arches are in charge of supplying the dorsal and ventral blood arteries with blood.
The earthworm's frontal blood arteries are in charge of delivering blood there. The "brain" of an earthworm. The neural system of an earthworm is basic. A ventral nerve cord that runs the entire length of the body is attached to the cerebral ganglia. Since each segment is linked to this cord, earthworms are able to move and react to various stimuli, including light, touch, chemicals, vibrations, and more. Worms have an anus at the back of the body where they excrete solid waste, and they have nephridiopores all over the body where they excrete liquid waste.
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Which type of virus can use all host polymerases for transcription and replication?.
Answer:
DNA Viruses
Explanation:
Cedar Key Florida, the freshwater aquifer used for the city water supply is continuous with the seawater surrounding the island. In which of the following situations is saltwater intrusion most likely to occur?
a. reduced use of city water through conservation efforts and unusually high rainfall throughout the year
b. increased use of city water and unusually high rainfall throughout the year
c. reduced use of city water through conservation efforts and unusually low rainfall throughout the year
d. increased use of city water and unusually low rainfall throughout the year
Use of city water has increased, and the annual rainfall has been unusually low. Option D is correct.
What is water scarcity?Both society and nature rely on water resources. To maintain our health, we require a consistent, clean supply of drinking water. Water is also necessary for agriculture, the development of energy, navigation, leisure, and manufacturing. Many of these applications impose stress on water resources, and climate change is expected to make matters worse. Climate change is projected to result in decreased water supplies and increased water demand in many locations. It would be difficult for water managers to balance the requirements of expanding communities, fragile ecosystems, farmers, ranchers, energy producers, and manufacturers at the same time. In other places, runoff, flooding, and sea level rise will be more of an issue than water scarcity. These consequences may lower water quality and harm infrastructure.
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true or false. most pathogens cannot invade the skin unless there is a wound or opening because of the tough waterproof keratin in the skin.
Most pathogens cannot invade the skin unless there is a wound or opening because of the tough waterproof keratin in the skin is true statement.
Vertebrates have skin, which is a soft outer tissue. It is the biggest organ in humans, with a total surface area of around 20 square feet. It uses a multi-layered system of cushioning, a cellular barrier, and protective oils to shield our internal organs from the environment.
Skin serves as more than simply a barrier between our internal organs and the outside world; it also actively contributes to preserving our health by regulating body temperature, such as through sweating and flushing in hot weather and causing goosebumps in cold weather. It may also generate Vitamin D from sunshine, which is crucial for the well-being of our bones.
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in prokaryotic cells, gene expression is inherently different than gene expression in eukaryotic cells. why? please choose the correct answer from the following choices, and then select the submit answer button. answer choices
Answer:
Transcription cannot occur in a nucleus in a prokaryotic cell.
Explanation:
what was a necessary experimental step used by meselson and stahl that allowed them to conclusively determine that dna replication occurred in a semiconservative manner?
Meselson and Stahl concluded from these experiments that DNA replication was semi-conservative: the DNA strands split off and each replicated themselves, resulting in each daughter molecule having one "old" and one "new" strand.
Density would be a defining characteristic between the old and new DNA. Meselson and Stahl created an approach called equilibrium density gradient centrifugation to gauge a density difference in the DNA. With this procedure, a cesium chloride solution is added to a tube where the DNA is centrifuged.
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the infectious dose of neisseria gonorrhoeae, the causative agent of the sexually-transmitted infection gonorrhea, is 1,000. this means
Because Vibrio bacteria need to be present in much higher numbers to cause sickness, interaction with far fewer Neisseria bacteria will do so.
Vibrio bacteria can be swallowed and result in watery diarrhea, which is frequently accompanied by nausea, vomiting, fever, and chills. These signs often appear within 24 hours after intake and remain for around 3 days. Rare cases of severe disease often affect immune-compromised individuals.
Meningococcal disease is brought on by Neisseria meningitides bacteria. Without being unwell, one in ten people carry these germs in the back of their nose and throat. Being a carrier is what we refer to as. Meningococcal disease is the term for a number of ailments that are occasionally brought on by the bacterium invading the body.
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What does evolution explain?.
The process of evolution is how organisms change over time in response to their environment.
The phrase "theory of evolution by natural selection," put out by Charles Darwin and Alfred Russel Wallace in the nineteenth century, is more commonly known as the theory of evolution.
According to the principle of natural selection, organisms breed more young than they can withstand in their surroundings. Those who are more physically capable of surviving, maturing, and reproducing. On the other hand, those who lack this fitness either do not live long enough to reproduce or have fewer offspring than their counterparts. Because the "fittest" organisms—those best adapted to their environment—are the ones that reproduce most successfully and are most likely to pass on their traits to the next generation, natural selection is sometimes summed up as "survival of the fittest."
Hence, evolution shows how organism adapt according to surroundings.
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according to research, when compared with children in heterosexual families, children of lesbian or gay parents
Lesbian, gay, and bisexual parents are equally likely to have children as heterosexual parents, contrary to scientific evidence to the contrary.
When someone experienced their parents' divorce as children, they were more prone to?According to research, children whose parents divorced during the previous 20 years were more likely to commit crimes, rebel by engaging in harmful conduct that threatens their health, or admit to starting to smoke or use prescription medication.
Which of the following is a benefit to parents who start their families young (in their 20s)?There will be more physical vitality in parents. The mother is more likely to experience less health issues. Parents are less inclined to give their kids strict expectations.
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What are the 5 bases of RNA?.
There are 5 bases present in DNA and RNA combined. However, each have 4 bases of which 3 are common and one varies.
RNA, Ribonucleic Acid consists of 4 nucleobases which are Adenine, Guanine, Cytosine and Uracil. The are represented as A, G, C and U respectively. They form the backbone of RNA. they are made up of alternating phosphate groups and ribose sugar.
DNA, Deoxyribonucleic Acid consists of 4 nucleobases which are Adenine, Guanine, Cytosine and Thymine. The are represented as A, G, C and T respectively. These nucleotides are the fundamental bases of the genetic code of organisms. They form the backbone of DNA.
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A human skin cell has 46 chromosomes and undergoes mitosis. How many chromosomes will be present in each daughter cells when mitosis is complete?.
Answer:
23 chromosomes (46 total)
Explanation:
During Interphase, the DNA is copied. Hence, there are 2 copies of one chromosome. This means that there are now 46 pairs of chromosome in the parent cell.
However, during cytokinesis, the cell divides itself into two, meaning that each daughter cell are left with 23 pairs of chromosomes or 46 chromosomes.
Thanks.
Definition(s):
Mitosis: The usual method of cell division, characterized typically by the resolving of the chromatin of the nucleus into a threadlike form, which condenses into chromosomes, each of which separates longitudinally into two parts, one part of each chromosome being retained in each of two new cells resulting from the original cell.
Cytokinesis: The division of the cell cytoplasm that usually follow mitotic or meiotic division of the nucleus.
Chromosomes: Any of several threadlike bodies, consisting of chromatin, that carry the genes in a linear order: the human species has 23 pairs, designated 1 to 22 in order of decreasing size and X and Y for the female and male sex chromosomes respectively.
Daughter cell: A cell produced by reproductive division of a cell during mitosis or meiosis.
Parent cell: A cell that is the source of other cells, such as a cell that divides to produce two or more daughter cells, or a stem cell that is a progenitor of other cells or is the first in a line of developing cell, is called a parent cell. It is sometimes also called the mother cell.
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What would happen if there was a mutation in the DNA sequence?.
A mutation might alter a property in a way that's even advantageous, such making it possible for an organism to more effectively adapt to its surroundings.
A point mutation is the most basic type of mutation. When one nucleotide base in a DNA sequence is swapped out for another, something happens. The production of the incorrect amino acid may result from the alteration. DNA is a flexible and dynamic molecule. As a result, due to a process known as mutation, the nucleotide sequences found therein are liable to alter. A particular mutation may prove harmless, beneficial, or even harmful depending on how it changes the genetic structure of an organism. The physiology of an affected organism can occasionally undergo drastic alterations as a result of a mutation. Naturally, it is first necessary to comprehend what mutations are and how they occur in order to better understand the various effects of mutations.
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exam if your right visual cortex stopped functioning, what parts of your visual field would be messing
Visual field cuts, trouble seeing objects or colors, trouble reading or writing, blindness, an inability to distinguish written words, an inability to detect moving things, and poor processing of visual information are all symptoms of occipital lobe damage.
Damage to the primary visual cortex, also known as V1, in the area of vision, but not to any other cortical region, eliminates visual awareness and causes persistent blindness. issue, known as anosognosia, which is when you are unaware that you are unaware of something. Even though they may be blindness, many patients believe that they can see.
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during electron transport, energy from is used to pump hydrogen ions into the . during electron transport, energy from is used to pump hydrogen ions into the . acetyl coa ... intermembrane space nadh and fadh2 ... mitochondrial matrix nadh ... mitochondrial matrix nadh and fadh2 ... intermembrane space nadh ... intermembrane space
During electron transport, energy from NADH is used to pump hydrogen ions into the FADH2.
So the correct option is (e)
The energy produced by NADH and FADH2-provided electrons is transported along the electron transport chain and used to force hydrogen ions over the intermembranous gap.
These systems, which are reminiscent of the electron transport systems employed during photosynthesis, allow for the passage of high-energy electrons produced by NADH and FADH2. On the inner membrane of the mitochondrion are the electron transport chains. Some of the high-energy electrons' energy is caught as they go down the chains. Hydrogen ions (from NADH and FADH2) are propelled beyond the inner membrane and into the intermembranous space using this energy. A higher concentration of hydrogen ions forms when hydrogen ions are forced over the inner membrane.
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estimating the age of a tree a piece of charcoal is found to contain 30% of the carbon 14 that it originally had. when did the tree die from which the charcoal came? use 5600 years as the half-life of carbon 14.
The age of a tree a piece of charcoal is found to contain 30% of the carbon 14 that it originally had. 1 × 10⁻⁴ years ago tree die from which the charcoal came.
Percentage of charcoal = 30%
Half-life of carbon 14 = 5600 years
Calculate the rate of decay of the tree by using the following formula
K = 0.693 ÷ T 1/2
T 1/2 is the half-life of carbon-14
K = 0.693 / 5600
K = 1.2 × 10⁻⁴ y⁻¹
Now calculate the age of the tree by using the following equation.
A(T) = A0e^-kt
A(T) = 0.3 A0
Where
0.3 A0 = A0e^-( 1.2 × 10⁻⁴t)
0.3 = e^-(1.2 × 10⁻⁴t)
ln 0.3 = -(1.2 × 10⁻⁴t)
T = ln 0.3 / (-1.2 × 10⁻⁴)
T = 1 × 10⁻⁴ Y
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amino acids found in the amino acid pool . amino acids found in the amino acid pool . must come from animal products help to synthesize essential amino acids require protein supplements to maintain their resources can be used for protein synthesis
The amino acid pool contains amino acids that can be used to create proteins.
Does our body keep an amino acid reserve for the production of proteins?The body retains a significant amount of free amino acids in the blood (approximately 35-65 mg/deciliter) even when one is fasting; this ensures that cells and tissues always have access to individual amino acids for the synthesis of proteins and essential amino acid derivatives.
The cellular pool of amino acids is derived from both dietary protein and the breakdown of cellular proteins. Since amino acids are used to produce new proteins, energy, and other biological molecules, this pool needs to be refilled with them.
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which process(es) increase genetic variation? group of answer choices genetic drift founder effects mutation natural selection
Meiosis boosts genetic variation. Because of recombination and independent assortment occurring during meiosis, each gamete has a distinct DNA set.
What are the three types of genetic variation?The genetic variety is the result of three distinct processes: mutation, recombination, and gene immigration. Mutation drives genetic diversity and evolution.
Why does genetic variety occur?Genetic variations can result from gene variants, often known as mutations, or they might result from a normal process in which genetic material is reorganized when a cell gets ready to reproduce. Genetic differences that alter gene activity or protein function can impart different features on an organism.
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taxol is an anticancer drug extracted from the pacific yew tree that disrupts microtubule formation in animal cells. when taxol is added to animal cells, cell division stops. specifically, taxol must affect .
Taxol is an anticancer drug extracted from the pacific yew tree that disrupts microtubule formation in animal cells. When taxol is added to animal cells, cell division stops. Specifically, taxol must affect the fibres of the mitotic spindle.
How does tаxol аffect microtubules?Tаxol (generic nаme pаclitаxel) is one of the most importаnt аnticаncer drugs аvаilаble in the world. It is relаted to the destruction of microtubules. Tаxol stаbilizes microtubules аnd reduces their dynаmicity, promoting mitotic аrrest аnd cell deаth. Upon аssembly of the α/β-tubulin heterodimer, GTP bound to β-tubulin is hydrolyzed to GDP reаching а steаdy-stаte equilibrium between free tubulin dimers аnd microtubules. Due to this, the formаtion of mitotic spindle fibre formаtion gets аrrested аnd аs а result, the cell division come to а hold.
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which of the following is not located anteriorly on the distal end of the humerus? group of answer choices capitulum coronoid fossa radial fossa olecranon fossa
The correct answer is option D, the Olecranon fossa.
The olecranon fossa is a deep triangular pit located on the back of the humerus, above the trochlea.
The coronoid fossa, which is placed superior to the trochlea and receives the coronoid process of the ulna, and the radial fossa, which receives the head of the radius, are both located superior to the capitulum on the anterior side of the condyle.
The capitellum, which forms the "ball" of the pivoting ball-and-socket portion of the elbow joint, is crucial to the elbow's ability to pivot. This area of the humerus rarely fractures. They are thought to be the cause of 6% of distal humerus fractures and 1% of elbow fractures.
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A state of joyful activity in which the subject performs an action effortlessly and skillfully is known as a(n) __________. a. ability b. flow state c. peak experience d. meditative state
A state of joyful activity in which the subject performs an action effortlessly and skillfully is known as a flow state.
Flow state, popularized by positive psychologists Mihaly Csikszentmihalyi and Jeanne Nakamura, defines a state in which you get completely involved in whatever you are doing given the correct conditions.
When you commit your full attention to an activity or work that you are immensely passionate about, utterly focused on, and completely involved in, you may find yourself establishing the circumstances for experiencing a flow state of mind.
The mind's regular chatter begins to fade, placing us in a state of non-distraction. Under normal conditions, the sensations that might overwhelm you (inhibition, hunger, exhaustion, or aches and pains) go away, and all that counts is your devotion to your craft.
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What are 5 ways to prevent the spread of germs?.
5 ways to prevent the spread of germs.
Nose, mouth, or eyes to arms to others:
hands to meals: ...
food to palms to food: ...
infected baby to palms to different children:
Animals to humans
Handwashing. preserving our arms clean is one of the maximum crucial steps we are able to take to keep away from getting ill and spreading germs to others. it's pleasant to scrub your hands with soap and easy jogging water for 20 seconds.
Infectious illnesses are caused by microscopic germs (which include bacteria or viruses) that get into the body and purpose trouble. some — but not all — infectious diseases spread at once from one individual to any other. Infectious diseases that unfold from character to man or woman are said to be contagious.
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the olfactory bulbs of the sheep . the olfactory bulbs of the sheep . carry visual information are less important as a food-getting sense than those in humans are located more superiorly than those in humans are relatively larger than those in humans
The olfactory bulbs of the sheep . carry visual information are less important as a food-getting sense are relatively larger than those in humans.
The ability to smell is one key way that sheep and human brains vary from one another. The olfactory bulb in a sheep's brain is two to three times bigger than a human's. It gives sheep a keen sense of smell, which is essential for survival.In comparison to the human brain, a sheep's brain has a larger olfactory bulb. The sheep's ability to smell better thanks to its bigger olfactory bulb is essential to its survival.Despite the sheep brain being significantly smaller overall, the olfactory bulb in sheep is two to three times the size of the human olfactory bulb. This illustrates how significant the sense of smell is to sheep.
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which of the following is the most common type of alternative splicing in animals and involves making mrna molecules that lack a complete exon?
This procedure includes removing specific exons and the introns that surround them from mRNA constructs before translation. Alternative 5' or 3' splicing: Exons can be joined at alternative 5' or 3' splice sites to facilitate alternative splicing.
The removal of specific sequences known as intervening sequences, or introns, or their "splicing out" is one of the processes in this processing, known as RNA splicing. Thus, the leftover sequences, referred to as exons, are what make up the final mRNA. These exons are linked to one another through the splicing procedure.
By combining various exons, a process known as alternative splicing produces various variations in the mRNA. Proteins are produced as isoforms via alternative splicing. Protein chemical and biological activity is altered as a result. Thus, more than one type of mRNA and more than one type of protein can be encoded by a single gene.
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Which of the following conditions will activate pyruvate dehydrogenase kinase, which catalyzes
the phosphorylation and inactivation of E1 in the pyruvate dehydrogenase complex?
A) Ca2+
B) Insulin
C) Elevated concentrations of acetyl-CoA
D) Elevated concentrations of NAD+ and ADP
E) Elevated concentrations of NADH and ATP
Increased [NAD+] inhibits pyruvate dehydrogenase kinase (PDH kinase)
Increased [NADH] activates pyruvate dehydrogenase kinase (PDH kinase)
Coenzyme A inhibits pyruvate dehydrogenase kinase (PDH kinase)
Acetyl-co A activates pyruvate dehydrogenase kinase (PDH kinase)
ADP inhibits pyruvate dehydrogenase kinase (PDH kinase)
Pyruvate dehydrogenase kinase, PDK, is an enzyme that acts to inhibit the activity of the pyruvate dehydrogenase enzyme by phosphorylating it using ATP. Its mechanism of action is catalyzing the phosphorylation of a specific Ser residue in the E1 subunit of the pyruvate dehydrogenase complex, rendering it inactive. By inhibiting the activity of the pyruvate dehydrogenase complex, PDK will decrease the oxidation of pyruvate to acetyl-coA and CO₂ in mitochondria and increase the conversion of pyruvate to lactate in the cytosol.
Since the pyruvate dehydrogenase complex is activated by an increase in the concentration of one or more of ADP, NAD+, or CoA-SH, its inhibitor, pyruvate dehydrogenase kinase, is inhibited by ADP, NAD+, CoA-SH, and pyruvate. However, the PDK is activated by the increased concentration of ATP, NADH, and acetyl-CoA.
Increased [NAD+] inhibits pyruvate dehydrogenase kinase (PDH kinase)
Increased [NADH] activates pyruvate dehydrogenase kinase (PDH kinase)
Coenzyme A inhibits pyruvate dehydrogenase kinase (PDH kinase)
Acetyl-co A activates pyruvate dehydrogenase kinase (PDH kinase)
ADP inhibits pyruvate dehydrogenase kinase (PDH kinase)
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What 4 factors can affect gene expression?.
The 4 elements that can affect gene expression: food plan, temperature, oxygen ranges, humidity, mild cycles, and the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately impacts the animal's phenotype.
Gene goes with the flow is anticipated to be a decrease in species that have low dispersal or mobility, that arise in fragmented habitats, in which there are long distances among populations, and while there are small population sizes. control of gene expression in eukaryotic cells happens at epigenetic, transcriptional, publish-transcriptional, translational, and post-translational degrees.
Epigenetic processes, consisting of DNA methylation, histone change, and numerous RNA-mediated techniques, are ideal to persuade gene expression mainly at the level of transcription; however, different steps within the procedure (for instance, translation) may also be regulated epigenetically.
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a neurospora mutant that was defective in the ability to convert citrulline to arginine (the last step in arginine biosynthesis) would be able to grow on
A Neurospora mutant that was defective in the ability to convert citrulline to arginine (the last step in arginine biosynthesis) would be able to grow on minimal medium supplemented with arginine.
What is Neurospora ?A genus of Ascomycete fungi is called Neurospora. The name of the genus, which means "nerve spore," alludes to the distinctive striations that mimic axons on the spores. The best-known member of this genus is the standard model organism in biology, Neurospora crassa.
What is arginine ?The amino acid with the formula CN(CH2)3CHCO2H is arginine. A guanidino group is attached to a typical amino acid framework in the molecule. The carboxylic acid is deprotonated and the amino and guanidino groups are both protonated at physiological pH, forming a cation.
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