Which one of the following statements most accurately describes methylation?

A. Methyl groups are most often added to
cytosines adjacent to guanine bases in or
near the promoter sequence, increasing the
probability of gene expression.
B. Methyl groups are most often added to
cytosines adjacent to guanine bases in or
near the promoter sequence, decreasing the
probability of gene expression.
C. Methyl groups are most often added to
adenine-thymine base pairs because they are
held by only two hydrogen bonds, and this
increases the probability of gene expression.
D. Methyl groups are most often added to
guanine-cytosine base pairs because they
are held by three hydrogen bonds, and this
decreases the probability of gene expression.
E. Methyl groups are added to most bases in
the promoter region of a specific gene so that
RNA polymerase and its associated proteins
will bind more efficiently.


B

Biology & Microbiology

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