Fine sediment bottoms with silt support a variety of

a. filter feeders.
b. suspension feeders.
c. epifauna.
d. infauna.
e. nekton.


D

Biology & Microbiology

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Boiling is not reliable for sterilization because

A. heat-sensitive instruments may be destroyed. B. heat-resistant endospores are unaffected. C. water boils at a higher temperature at lower altitudes. D. viruses are more sensitive to heat than bacteria.

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Which subatomic particles of a pigment absorb light?

a. electrons only b. protons only c. neutrons only d. electrons and protons e. protons and neutrons

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Clones of B or T cells are:

a. being produced continually b. interchangeable c. produced only when their surface receptors recognize a specific antigen d. involved in innate immunity e. produced and mature in the bone marrow

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Which event could result in an inversion?

A) A 360° rotation of a chromosomal region following two double-strand breaks in a chromosome's DNA. B) A crossover between two DNA sequences in different places on the same chromosome and that are inverted repeats of each other. C) A crossover between two repeated DNA sequences that are in different places on the same chromosome and are oriented in the same direction. D) A crossover between two repetitive sequences on different chromosomes.

Biology & Microbiology