A cell that cannot form spindle fibers cannot ____
a. engage in energy production
b. exchange gases across the plasma membrane
c. perform mitosis nor meiosis
d. perform DNA replication
e. engage in protein synthesis
ANSWER: c
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Desensitization of a cell to a ligand may involve all of the following except
A) destruction of the ligand. B) a lessened response to the ligand. C) receptor down-regulation. D) receptor-mediated endocytosis. E) lowered affinity of a receptor for the ligand.
Which of the following is NOT true about
cyanobacteria? a. Cyanobacteria have the same lightcapturing chlorophylls as plants. b. Chloroplasts evolved from ancient cyanobacteria. c. Cyanobacteria can fix carbon. d. Cyanobacteria can fix nitrogen. e. Cyanobacteria put nearly all of the nitrogen into Earth’s atmosphere
What happens to a lizard's metabolic rate when the temperature increases 10°C?
A) The metabolic rate stays constant. B) The metabolic rate approximately doubles. C) The metabolic rate approximately triples. D) The metabolic rate approximately quadruples.
Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be _____
A) negative thigmotropism B) negative phototropism C) negative gravitropism D) the opposite of circadian rhythms