The trophic level that an organism belongs to

a. is determined by what it uses as an energy source.
b. determines the population it belongs to.
c. can be thought of as its feeding level.
d. is both a and c.


c

Biology & Microbiology

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Isotopes that are unstable and decay when their nucleus breaks up into elements with lower atomic numbers, emitting significant amounts of energy in the process, are called:

A. energetic B. ionic C. radioactive D. isometric

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Pathogens are able to produce enzymes that directly destroy or inactivate antibodies. These enzymes are referred to as:

a. proteases. b. nucleases. c. collagenases. d. polymerases.

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Which of the following is NOT part of the bark

of a tree?

a. secondary phloem b. secondary xylem c. cork cambium d. periderm e. more than one of these is NOT part of the bark of a tree

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A condition in which wheezing occurs with breathlessness and a persistent cough, and yields yellowish or greenish phlegm is

A) asthma. B) bronchitis. C) lung cancer. D) lupus. E) anemia.

Biology & Microbiology