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
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________ defines the lowest quantity of an antigen that can be detected in a serological test
A) Specificity B) Antigenic capacity C) Minimal inhibitory concentration D) Sensitivity
Natural selection
A. is evolution. B. is a key mechanism that causes evolution to happen. C. occurs at the population level. D. results in reproductive success. E. occurs at the population level and is a key mechanism that causes evolution to happen.
The scientist credited with the discovery of DNA, which he called "nuclein," from salmon sperm in 1869 is
A) Johann Friedrich Meischer. B) Eduard Zacharias. C) Fredrick Griffiths. D) Martha Chase. E) Oswald Avery.
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