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
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A ribozyme catalyzes a reaction on itself and actually changes shape. This is an example of
A. intra-enzyme reactions. B. inter-enzyme reactions. C. intramolecular catalysis. D. intermolecular catalysis.
All of the following are second messengers except
A) calcium ions. B) IP3. C) DAG. D) cameleons. E) PDGF.
Primary production is the:
a. rate of photosynthesis b. rate of energy flow c. amount of energy stored in the ecosystem d. amount of energy utilized e. rate at which producers capture and store energy
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.