The type of movement that is specific and requires carrier molecules and energy is
A. active transport.
B. exocytosis.
C. facilitated diffusion.
D. osmosis.
E. endocytosis.
Answer: A
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Crossing over occurs during
a. anaphase I. b. metaphase II. c. prophase I. d. prophase II. e. telophase II.
If the kidneys cannot excrete enough acid, which condition occurs?
a. metabolic alkalosis b. respiratory acidosis c. metabolic acidosis d. respiratory alkalosis e. compensatory alkalosis
A "structuralist" biologist would explain an organism's features as the result of ________
A) natural selection acting on random, small-scale variation B) the inheritance of traits acquired over an individual's lifetime C) principles of mathematics and physics that determine form and function D) major "leaps" or "jumps" in phenotype within one generation E) divine intervention in an organism's DNA
The only genes necessary for the retroviral lifecycle are gag and pol
Indicate whether the statement is true or false