In order to learn about the relationships among populations, we would need to examine the variation in DNA caused simply by ________.

A. mutation
B. natural selection
C. genetic drift
D. geography


Answer: A. mutation

Biology & Microbiology

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Immune tolerance of some self antigens need only be maintained in the T cell population because certain B cells can't become activated without the help of T cells.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Fertilization is indicated by

a. A. b. B. c. C. d. D. e. E.

Biology & Microbiology

In the male, the primary target of FSH is

A) the prostate gland. B) seminal vesicles. C) Sertoli cells. D) bulbourethral glands. E) interstitial cells.

Biology & Microbiology

Sulfur has an atomic number of 16 and a mass number of 32. How many electrons are needed to complete the valence shell of a sulfur atom?

A) 0 B) 1 C) 2 D) 6 E) 8

Biology & Microbiology