If a shoot’s tip breaks off, ____ moves into lateral buds and stimulates cell divisions
a. auxin
b. gibberellin
c. cytokinin
d. abscisic acid
e. ethylene
ANSWER: c
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Air flow in a microbiology laboratory should be:
a. from lower to higher risk areas. b. minimized as much as possible. c. optimized to prevent the settling of dan-gerous aerosols. d. well-filtered by recirculating it through numerous filters before recycling.
Recombinant DNA was first made in
a. 1952. b. 1962. c. 1972. d. 1982. e. 1992.
Many freshwater invertebrates eliminate ammonia by...
a) simple diffusion across the skin b) simple diffusion across the gill membranes c) converting it to uric acid and eliminating it with solid wastes d) converting it to urea and eliminating it in their urine
Which group is believed to be ancestral to plants?
A. diatoms B. red algae C. brown algae D. green algae