The initial attachment required for establishment of an intestinal infection is by

A. flagella.
B. cilia.
C. pseudopodia.
D. pili.


D

Biology & Microbiology

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Mitochondria and chloroplasts are thought to have once been free-living bacteria that invaded another cell

Indicate whether this statement is true or false.

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Which combination of conditions would promote the most rapid diffusion across a cell membrane?

a. large molecule, high temperature, large concentration gradient b. large molecule, low temperature, small concentration gradient c. small molecule, low temperature, small concentration gradient d. small molecule, high temperature, large concentration gradient

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What typically has to happen before a fruit develops? I) flowering II) pollination III) double fertilization

A) I only
B) I and II
C) II and III
D) I, II, and III

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The rate of production of new biomass by heterotrophs is called

A. primary productivity. B. gross productivity. C. net productivity. D. secondary productivity. E. consumer productivity.

Biology & Microbiology