Some protists have a pellicle, which is used for

a. defensive purposes.
b. sexual reproduction.
c. structural support.
d. water absorption.
e. food storage.


C

Biology & Microbiology

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Which of the following arise, directly or indirectly, from meristematic activity?

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During forceful exhalation, the ____ muscles contract

a. diaphragm and abdominal b. external intercostal c. internal intercostal d. diaphragm and external intercostal e. diaphragm and internal intercostal

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The basic unit of nervous tissue is the ________

A) dendrite B) axon C) neuron D) brain

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The rate of diffusion of molecules would be fastest in a cell with an

A. internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures. B. internal concentration of 40 percent and an external concentration of 35 percent in warm temperatures. C. internal concentration of 45 percent and an external concentration of 50 percent in cold temperatures. D. internal concentration of 50 percent and an external concentration of 12 percent in cold temperatures.

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