Answer the question using the accompanying figure. At which point in this action potential diagram are Na+ inactivation
gates opening?
a. A
b. B
c. C
d. D
e. E
ANSWER: d
Biology & Microbiology
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The central issue in population genetics is
A. natural selection. B. population size. C. rates of mutation. D. genetic variation. E. phenotypic variation.
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Oxygen has an atomic number of 8. This
means that oxygen has 8
a. electrons in its outer most shell. b. neutrons in its nucleus. c. protons and 8 neutrons in its nucleus. d. protons in its nucleus. e. neutrons in its outer shell.
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In humoral immunity, cells that are produced by activated B cells and function by secreting antibodies are called
A. cytotoxic T cells. B. helper T cells. C. plasma cells. D. macrophages. E. memory cells.
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At which gestational week is the developing human designated a fetus?
a. 4 b. 8 c. 12 d. 16 e. 20
Biology & Microbiology