Polyandry is the mating system in which ____
a. one male and one female form a long-term association
b. both males and females mate with multiple partners
c. one male mates with many females
d. one female mates with many males
e. both males and females provide care to offspring
ANSWER: d
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A substance that speeds up reactions in your body is known as
A) a placebo B) fiber C) a vitamin D) an enzyme
The ability to taste PTC and other bitter chemicals is controlled by ____
a. hormone levels that change throughout life b. the presence of fats and sugars in the food being eaten c. the amount of PTC exposure as a child d. the amount of capsaicin present in taste buds e. proteins on the surface of receptor cells
Which invertebrates usually have a concentration of olfactory receptors at their head end?
A. Cnidarians B. Echinoderms C. Bilateral invertebrates D. Predatory invertebrates E. Prey invertebrates
MHC proteins
a. are always expressed on cell surfaces. b. have embedded peptides derived from breakdown products of cell metabolism. c. present peptide antigens to CLSs and Th cells. d. are described by all of the above.