Which of the following statements concerning plasma cells is FALSE?
A) They live for many years and function as memory cells.
B) They are descended from activated B cells.
C) They can produce large quantities of antibodies on a daily basis.
D) They secrete a single type of antibody molecule specific for a single epitope.
E) The antibodies they produce can remain in circulation for weeks.
A
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Two pure-breeding mutant plants produce white flowers. When they are crossed, all of the progeny have wild-type purple flowers. What does this genetic complementation tell you?
A) The genes are part of distinct biosynthetic pathways. B) The two lines exhibit different mutations in the same gene. C) More than one gene is involved in determining the phenotype. D) The allele is pleiotropic. E) The allele exhibits incomplete dominance.
What are commonly called sea slugs and are actually marine gastropods with a greatly reduced shell?
A. Mollusks B. Cephalopods C. Oligochaetes D. Nudibranchs E. Chitons
If a person is trying to use operant conditioning on their child, they would need to
A. repeatedly encourage the child to perform a behavior and then wait several days before rewarding the good behavior so the child associates the behavior with the reward. B. never encourage a specific behavior from a child but randomly give them rewards. C. repeatedly encourage the child to perform a behavior and then reward the good behavior so the child associates the behavior with the reward. D. wait until the child accidentally performs a behavior that is desirable and then reward the good behavior so the child associates the behavior with the reward.
After glycolysis but before the citric acid cycle
A) pyruvate is oxidized. B) a carbon atom is added to pyruvate to make a four-carbon compound. C) coenzyme A is cleaved off pyruvate. D) glucose is split, producing two molecules of pyruvate.