When a B cell binds to its specific antigen, it undergoes ________ to produce antibodies to
the antigen
a. reproduction
b. clonal expansion
c. clonal anergy
d. differentiation
Answer: B
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The default state for the lac operon is off, while the default state for the trp operon is on. Explain this
contradiction and the mechanism of control via the repressor proteins.
What will be an ideal response?Which of the following is NOT an adaptation of Burchell's zebras to their environment?
a. camouflage b. a unique stomach c. behavioral activities d. stripes e. asexual reproduction
Which of the following best describes opportunistic or r-strategy, organisms?
A . They reach sexual maturity rapidly B. They reach their adult size slowly C. They attain a large body size D. They live for a long time E. The size of their population remains fairly constant
After attaching to a bacterial cell, a bacteriophage typically
A. extracts DNA from the cell. B. extracts protein from the cell. C. transforms the cell into a virulent strain. D. injects protein into the cell. E. injects DNA into the cell.