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  • What is the result of heterochromatin formation? The N-terminal tail of histone H3 can be extensively modified, and depending on the number, location, and combination of these modifications, these...
    What is the result of heterochromatin formation? The N-terminal tail of histone H3 can be extensively modified, and depending on the number, location, and combination of these modifications, these...
    The correct answer to this question is B, Gene silencing. Gene silencing occurs in cells. It regulates gene expressions to prevent a specific gene from being expressed. When this happens, it reduces the change of the gene being communicated. This process can occur during both translation and transcription. Often, this regulation is used for research purposes. Gene silencing has become popular in modern times to help fight diseases such as infections and to help fight cancer. There are several types of gene silencing. Genomic Imprinting and RNA-directed DNA methylation are examples that occur during transcription. Nonsense-mediated decay is a type that occurs post-transcription.

  • Which of the following is the best explanation for this observation? When 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell...
    Which of the following is the best explanation for this observation? When 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell...
    The answer to this is letter E. Cells convert some of the energy of ATP hydrolysis into other forms of energy besides heat. This is something that happens to the body all the time. The body is like an enclosed space too. The energy of ATP does not always result in getting more heat. A lot of times, the energy is used for different purposes. It can be used by people to move. It can be used by people to think. The energy received from the cells can be used for the various situations that people have to go through every day. Cells are very much efficient and even more so than non-living systems for sure.

  • Which of the following is not true of the N terminal tail of these histones? The core histones are small, basic proteins that have a globular domain at the C-terminus and a long extended...
    Which of the following is not true of the N terminal tail of these histones? The core histones are small, basic proteins that have a globular domain at the C-terminus and a long extended...
    The answer to this question is option C Histones are rich in the amino acids lysine and arginine. H1 binds to the nucleosome and to “linker DNA,” stabilizing the chromatin fiber. Histones are positively charged and they bind to negatively charged DNA to keep DNA tightly packed together. Negatively charged DNA loops twice around positively charged histone octamer, to form nucleosome which appears as “beads on a string.” Histones do not bind to DNA in a sequence specific manner. % types of histones have been identified - H1, H2A, H2, H3 and H4. H1 serves as linker histones. H1 binds to the nucleosome and to “linker DNA,” thereby stabilizing the chromatin fiber. While H2B, H3 and H4are associated with DNA to form nucleosomes.

  • Which phase of mitosis is shown in the picture below?
    Which phase of mitosis is shown in the picture below?
    Telophase

  • What is the anticodon on the tRNA in the P-site of the ribosome when release factor binds to the A-site?
    What is the anticodon on the tRNA in the P-site of the ribosome when release factor binds to the A-site?
    1. 5 -CCA-3

  • Which statement is not correct with regard to redox (oxidation-reduction) reactions?
    Which statement is not correct with regard to redox (oxidation-reduction) reactions?
    1. A molecule is reduced if it loses electrons.

  • Where do you think the block to replication arises? A molecule of bacterial DNA introduced into a yest cell is imported into thenucleus but fails to replicate the yeast DNA.
    Where do you think the block to replication arises? A molecule of bacterial DNA introduced into a yest cell is imported into thenucleus but fails to replicate the yeast DNA.
    Initiator proteins

  • How were individuals chromosomes shown in a figure in the textbook painted as different colors? The process of sorting human chromosomes pair by size and morphology is called karyotyping. A modern...
    How were individuals chromosomes shown in a figure in the textbook painted as different colors? The process of sorting human chromosomes pair by size and morphology is called karyotyping. A modern...
    Using fluorescent DNA molecules

  • Which of the following statements describes the results of this reaction? C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O + Energy
    Which of the following statements describes the results of this reaction? C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O + Energy
    1. C6H12O6 is oxidized and O2 is reduced.

  • Which of the following is (are) true for anabolic pathways?
    Which of the following is (are) true for anabolic pathways?
    Both B and C

  • Which of the following do not contribute to the angiogenic switch?
    Which of the following do not contribute to the angiogenic switch?
    Decreased expression of proangiogenic proteins by cells in the stroma surrounding the tumor

  • Which of the followings contains the largest amount of mitochondria?
    Which of the followings contains the largest amount of mitochondria?
    SpermsRed blood cells do not have mitochondria. Although bacteria can carry out respiration, they do not have mitochondria. They have infolding membrane to perform the respiration. Fat cells are not active. They do not need many mitochondria. Sperms require many mitochondria to provide a lot of energy for swimming.

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