Which scenario is an example of commensalism?

a. acacia trees coevolved with ant colonies that protect the tree from herbivores
b. bacteria provide glucose to legume plants
c. cattle egrets feed on insects flushed out from the grass by cattle
d. plants coevolved with their pollinators


ANSWER: c

Biology & Microbiology

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Determination ____, while differentiation ____

a. is a cell's commitment to a developmental fate; is a cell's development into specialized cell types b. is a cell's development into specialized cell types; is a cell's commitment to a developmental fate c. is permanent; is reversible d. is a result of a cell's own genetic program; is a result of influence by other cells e. results in the final fate of a cell; results in determination

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The accompanying figure best represents what happens at a(n) ____

a. neuromuscular junction b. muscle fiber c. postsynaptic terminal d. neuronal membrane e. negative feedback loop

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A cuticle

a. resists water loss. b. covers epidermal cells. c. may contain waxes and cutin. d. resists attack by microorganisms. e. does all of these

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Which of the following is not true of extended-spectrum beta-lactamases (ESBL) and gram negative bacilli?

A) Due to mutations in a bacteria's original chromosome B) Should be included in the susceptibility testing for all of Enterobacteriaceae C) Usually susceptible to carbapenems, cephamycins, and beta-lactamase inhibitors D) ESBLs destroy carboxypenicillins, ureidopenicillins, aztreonam, and cephalosporins

Biology & Microbiology