Evolution can be observed and tested
a. true
b. false
Ans: a. true
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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.
With regard to RNA polymerase proofreading ability, which of the following is correct?
A) It is a very stringent activity, no tolerance for mistakes. B) It is similar to that of DNA polymerases. C) There are specialized mRNA repair pathways that fix errors. D) There is absolutely no proofreading that needs to be done. E) The 3' ? 5' exonuclease activity is sufficient
A male is heterozygous for the trait that produces freckles on the skin, and he has freckles. If he marries a woman who is also heterozygous for freckles, ______ percent of their children are predicted to be freckled. Also, of all their children, ______ percent are predicted to be heterozygous. rev:
A. 100%, 100% B. 75%, 50% C. 75%, 25% D. 50%, 50% E. 100%, 75%
In the light-dependent reactions of photosynthesis, an excited electron from photosystem II is passed along an electron
transport chain to ____.
a. NAD+b. NADH c. photosystem I d. oxygen e. water