Molecules assisted by carrier proteins may cross a selectively permeable membrane by
A) facilitated diffusion.
B) active transport.
C) osmosis.
D) simple diffusion.
E) endocytosis.
A
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The three steps that take place in each cycle during PCR occur in which order?
A. DNA denaturation, annealing, and synthesis B. DNA annealing, denaturation, and synthesis C. DNA synthesis, denaturation, and annealing D. None of the choices are correct.
While touring the ancient Egypt exhibit at the local history museum, you learn that ancient Egyptians would slash figs in order to stimulate ripening. Based on your knowledge of plant hormones you hypothesize that wounding the figs must release:
A. ethylene. B. gibberellin. C. abscisic acid. D. cytokinin. E. indoleacetic acid.
You are working with a specific enzyme-catalyzed reaction in the lab. You are a very careful experimentalist, and as a result, at the beginning of each of your experiments, you measure the temperature in the lab. On days 1 through 5, the temperature in the lab was 20oC. Today is day 6 of your experiment, and the temperature in the lab is 30oC. How do you predict that this will alter the rate of your enzyme-catalyzed reaction?
A. It could possibly increase or decrease the rate B. It will decrease the rate C. it will not affect the rate D. It will increase the rate
In photosynthesis, ATP is made by
A. the Krebs cycle. B. the passing of electrons from photosystem I to an electron transport chain. C. chemiosmosis. D. glycolysis. E. the Calvin cycle.