Sperm cells swim actively using their flagellum. To support this activity, these cells have high

numbers of __________.



a. mitochondria
b. endoplasmic reticulum
c. muscles
d. ribosomes


A

Biology & Microbiology

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What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?

A. contact-to-contact signaling B. intercellular signaling C. autocrine signaling D. paracrine signaling E. endocrine signaling

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E. coli, a protozoan that ranges from 15 to 25 µm in diameter, can contain up to eight nuclei in mature cysts. How would the karyosome expect to appear on a stained slide?

a. Small, usually compact b. Large, usually compact c. Small, irregularly shaped d. Large, not compact

Biology & Microbiology

Antibody testing requires

A. only a known antigen. B. only a known antibody. C. both a known antigen and a known antibody. D. either a known antigen or a known antibody.

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Within the chordate classes, the unique characteristic of the class Aves is:

a. flight. b. production of uric acid. c. feathers. d. endothermy. e. a forked tongue

Biology & Microbiology