In a long DNA molecule, each origin of replication produces a _____ with a _____ on each side
A. replication bubble; replication fork
B. replication fork; replication bubble
C. replication bubble; DNA ligase
D. replication fork; DNA ligase
E. None of the answer options are correct.
A
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When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side, what happened to the seedling?
A. It bent away from the directional light. B. It did not respond to the directional light. C. It grew toward the light, as expected. D. It waved back and forth. E. It wilted and died.
Four of the five answers listed below are heterotrophic. Select the exception
a. consumers b. carnivores c. herbivores d. parasites e. producers
Glycolysis is an aerobic process.
a. true b. false
Which of the following statements about protein kinase A (PKA) is false?
a. In the inactive state, PKA exists as a tetramer of two regulatory (R) and two catalytic (C) subunits. b. PKA binds a total of four molecules of cAMP, one on each of the four subunits. c. PKA binds a total of four molecules, two molecules on each of the two regulatory (R) subunits. d. Once activated, the catalytic (C) subunits dissociate and activate target molecules.