Oxygen is toxic to
A) strict anaerobes.
B) strict aerobes.
C) aerotolerant organisms.
D) facultative anaerobes.
E) all of the above
A) strict anaerobes.
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The same molecule may be both __________ and
__________. a. enzyme; neurotransmitter b. neurotransmitter; hormone c. enzyme; pheromone d. hormone; second messenger e. hormone; local signaling molecule
The E. coli lac operon has ________ operator sequences.
A. one B. two C. three D. four
During translation, chain elongation continues until:
a) a stop codon is encountered. b) all the tRNAs are converted to mRNAs. c) all the tRNAs are enzymatically broken down. d) the ribosome falls off the end of the mRNA. e) all the amino acids in the cell are used up.
Which of the following kingdoms can do photosynthesis?
A. all animals B. some protists C. all bacteria D. some fungi E. all archaea