Cholesterol and lecithin are building blocks of
a. proteins.
b. carbohydrates.
c. fats.
d. cell membranes.
e. ribosomes.
D
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Which of the following is NOT an example of a sex steroid hormone?
A. estrogen B. progesterone C. prolactin D. testosterone E. estradiol
A female bowerbird being unable to recognize
the mating ritual of a male toucan is an example of what type of isolating mechanism?
a. genetic b. ecological c. behavioral d. mechanical e. temporal
Which of the following is true of metabolism in its entirety in all organisms?
A) Metabolism depends on a constant supply of energy from food. B) Metabolism uses all of an organism's resources. C) Metabolism consists of all the energy transformation reactions in an organism. D) Metabolism manages the increase of entropy in an organism.
Which of the following would test positive for the tuberculin response?
A) someone who has previously had tuberculosis B) someone who has been immunized with the tuberculosis vaccine C) someone who has previously been injected subcutaneously with tuberculin D) someone who has been immunized with the tuberculosis vaccine or has previously had tuberculosis E) someone who has been immunized with the tuberculosis vaccine or previously been injected subcutaneously with tuberculin