A given enzyme works on
any number of different substrates.
one of two possible substrates.
no substrate.
one type of substrate.
inhibitors.
one type of substrate.
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Scientists have demonstrated that the cholera bacteria, Vibrio cholerae, can exist as a rather harmless form or, by phage conversion, can exist as a disease-causing, virulent form. This conversion is caused by
A. the phage entering the cholera bacterium genome and causing the bacterium's cell to lyse. B. the phage introducing a gene into the bacterium's chromosome that codes for the cholera toxin that can cause death in humans. C. the phage altering the cell wall of the cholera bacterium that produces a toxin that can cause death in humans. D. the phage alters the host cell, which permits direct entry of the cholera bacterium into the host cell leading to death in humans.
Which stage(s) produce(s) the characteristic
chills and fever of the disease? a. A b. B c. C d. A and B e. B and C
Why is there very little physical evidence of life from rocks of the Archaean eon?
a. Those rocks have been deeply buried in most parts of the world. b. Those rocks occupy inaccessible areas of mountainous regions. c. Those rocks have been greatly eroded in most parts of the world. d. Those rocks occupy the polar regions and are thus covered by glaciers. e. Those rocks have been deposited in oceanic trenches deep in the oceans.
Which of the following would be best categorized as a phagocyte?
A) eosinophil B) lymphocyte C) mast cell D) dendritic cell