What is meant by the clonal expansion of a B cell?
a. An activated B cell will engulf and digest anything foreign.
b. An activated B cell divides into cells that give rise to memory B cells and plasma cells.
c. An activated B cell will immediately begin to produce antibodies.
d. An activated B cell will kill infected host cells.
Ans: b. An activated B cell divides into cells that give rise to memory B cells and plasma cells.
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Analyzing DNA sequences in different populations provided us with what new information?
A. that the bonobo and chimpanzee are two different species B. that the gorilla is more closely related to humans than the orangutan C. that the chimpanzees are more closely related to humans than gorillas are D. that Old World monkeys are separate from the Apes E. None of the answer options is correct.
Which of the following is glycerol?
A. C3H5(OH)3 B. C6H12O6 C. C14H28O D. C2H5O2N
Root formation in stem cuttings can be improved by the application of ____.
A. synthetic auxins B. abscisic acid C. salicylic acid D. ethylene E. gibberellin
Which microscope achieves the highest magnification and greatest resolution?
A) compound light microscope B) phase-contrast microscope C) darkfield microscope D) fluorescence microscope E) electron microscope