DNA methylation may be a significant mode of genetic regulation in eukaryotes. Methylation refers to ________
A) changes in DNA-DNA hydrogen binding
B) altering translational activity, especially of highly methylated tRNAs
C) altering RNA polymerase activity by methylation
D) alteration of DNA polymerase activity by addition of methyl groups to glycine residues
E) addition of methyl groups to the cytosine of CG doublets
E
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Nudibranchs belong to the class ____ of the phylum Mollusca
a. Gastropoda b. Cephalopoda c. Bivalvia d. Polyplacophora e. Pulmonata
In a hypotonic solution, what happens to mammalian cells such as red blood cells?
a. shrink due to water loss b. stay the same size due to water moving in and out at the same rate c. swell due to water gain d. apoptosis
The proportion of oxygen in our atmosphere today
A. has increased gradually over the past billion years as a result of cyanobacteria. B. has increased to 20% since before photosynthesis. C. has remained about the same since the first organisms developed. D. has decreased to 10%, from higher levels before photosynthesis. E. increased rapidly since the development of water-splitting photosynthesis and eukaryotes.
Why were Darwin's ideas so widely accepted by scientists of his day?
A) He published his book soon after he returned to England, and all his recollections were fresh in his mind. B) Darwin's ideas fit well with what most people already understood about evolution. C) Darwin presented extensive evidence from many areas of biology to support his ideas. D) Darwin was from a rich and powerful family.