Which of the following is generally notinvolved in gene inactivation by histone modification?
A. Modification leads to chromatin condensation.
B. The RNA polymerase associated with the gene dissociates from DNA when HDACs bind to the corepressor.
C. Increased acetylation of the nucleosomes occurs in the vicinity of the gene.
D. Increased methylation of the nucleosomes occurs in the vicinity of the gene.
C
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Which of the following determines whether or not a wine is considered to be dry?
A. The percentage of alcohol after fermentation B. The amount of free sugar after fermentation C. The type of grape used as a starting material D. The amount of carbon dioxide after fermentation
In secondary active transport, the movement of materials is driven by energy though no ATP (adenosine triphosphate) is expended. What is the source of energy that is driving secondary active transport?
a. The glucose involved in transport can be utilized as an energy source to drive the pump during secondary transport. b. As a secondary energy source, the cell can use the potential energy found in proteins. c. The electrochemical gradient created during primary active transport creates potential energy that translates to kinetic energy. d. Because the membrane is a phospholipid bilayer, it has plenty of lipids on hand to use as energy to drive secondary active transport.
By evaluating and selecting mates with superior qualities, an animal can increase its
A. reproductive success. B. learning. C. competitive strategies. D. foraging efficiency. E. length of life.
A mass of rapidly dividing cells that have potentially lost the ability to regulate cell division is called a(n)
A) neoplasm. B) angiogenesis. C) malignancy. D) metastasis. E) keratosis.