DNA methylation is the only known natural modification of DNA. It affects

A. guanine bases.
B. cytosine bases.
C. adenine bases.
D. thymine bases.


Answer: B

Biology & Microbiology

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Natural selection

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The scientist credited with the discovery of DNA, which he called "nuclein," from salmon sperm in 1869 is

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The inner lining of many tube-like structures within the body, including blood vessels and

ducts, are composed of what type of tissue?

a. epithelial b. connective c. nervous d. muscle

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