All cells possess all of the following components EXCEPT

A) a nuclear membrane.
B) ribosomes.
C) a plasma cell membrane.
D) cytoplasm.
E) genetic material (DNA or RNA).


A

Biology & Microbiology

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A ribozyme catalyzes a reaction on itself and actually changes shape. This is an example of

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All of the following are second messengers except

A) calcium ions. B) IP3. C) DAG. D) cameleons. E) PDGF.

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Primary production is the:

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Endergonic reactions

a. result in products with less energy than the reactants. b. require a net input of energy. c. occur in the breakdown of glucose. d. are used by cells to provide energy for biological reactions. e. break down large molecules into smaller molecules.

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