In the absence of a repressor, where will RNA polymerase bind to a prokaryotic operon to initiate transcription?
a. transcriptional start site
b. operator
c. promoter
d. coding region
c. promoter
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_____ are close interactions between species that have evolved over long periods of time. When these interactions enhance the reproduction and population growth of both species, they are called _____
A. Symbioses; mutualisms B. Mutualisms; symbioses C. Symbioses; antagonisms D. Antagonisms; symbioses E. Antagonisms; mutualisms F. Mutualisms; antagonisms
Treatment of HIV attempts to
A. block reverse transcriptase activity. B. block attachment to host cells. C. block viral integrase. D. block viral protease activity. E. All of the above
Surgery is an effective method of treating cancer when
A) a primary tumor has spread through the blood stream. B) a primary tumor is yet to invade healthy tissue. C) all rapidly dividing cells are targeted by the surgery. D) a patient has multiple tumors spread across his or her body.
What is a necessary component of a powerful immune system?
A. immunological tolerance B. strict temperature homeostasis C. thousands of different Ig genes D. a large thymus gland