Characteristics of all the members of the family Enterobacteriaceae include
A. ferment lactose.
B. are normal flora of human intestines.
C. produce enterotoxins.
D. ferment glucose.
E. All of the choices are correct.
Answer: D. ferment glucose.
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A. C3 photosynthesis B. Mycorrhizal association C. C4 photosynthesis D. Mycoheterotrophy E. Symbiosis
Distilled water would be considered ____ to body cells
a. isotonic b. hypertonic c. hypotonic d. protonic e. aquatonic
Bacteria use restriction enzymes to
a. integrate viral DNA. b. destroy viral DNA. c. prevent mutation of their DNA. d. copy their genes. e. inhibit the expression of some of their genes.
A photosystem channels the excitation energy gathered by absorption of light by any one of the pigment molecules to a specific reaction center chlorophyll, which in turn passes the energy to
A. cytochrome. B. accessory pigments. C. photosystem II. D. the secondary electron center. E. the primary electron acceptor.