Which of the following is NOT a correct statement about food chains?
a. the food-chain concept is helpful in thinking about community interactions, but is probably an oversimplification of the actual interactions
b. food webs show the relationships among multiple food chains
c. food webs are b better than food chains for showing the position of omnivores within the community
d. food chains are often complex and intertwined
e. all of the above are correct statements about food chains
Ans: e. all of the above are correct statements about food chains
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A broad-sense heritability of 0.8 for a particular trait indicates that
A) phenotypic variation stems from environmental influences. B) the trait is 80% heritable. C) genes and environment play equal roles in shaping the trait. D) genetic differences among individuals account for much of the phenotypic variation for that trait. E) None of these
Complex societies involving a caste system, where individuals are born into a specific role, can be found among which of the following?
A) Amphibians B) Birds C) Reptiles D) Fishes E) Insects
Superantigens exert their damaging effects by
A. killing large numbers of phagocytic cells. B. causing the massive and non-specific release of cytokines by T cells. C. forming harmful antibody aggregates. D. All of the choices are correct.
Which components of the cytoskeleton allow the cell to resist damage from stretching forces?
a. microfilaments and microtubules b. intermediate filaments and microtubules c. microfilaments and intermediate filaments d. only intermediate filaments