HIV is the virus that causes AIDS. In the mid-1990s, researchers discovered an enzyme in HIV called protease. Once the enzyme's structure was known, researchers began looking for drugs that would fit into the active site and block it
If this strategy for stopping HIV infections were successful, it would be an example of what phenomenon? A) vaccination
B) denaturation
C) allosteric regulation
D) competitive inhibition
D
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Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows are autotrophic. B. the cow, like the rabbit, ingests its feces. C. cows can manufacture all 20 amino acids out of sugars in the liver. D. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose. E. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
For humans, which parent’s gamete will determine the sex of the child?
a. The father, because his gametes only contain the Y chromosome. b. The mother, because her gametes only contain the X chromosome. c. The father, because his gametes can contain either the X or Y chromosome. d. The mother, because her gametes can contain either the X or Y chromosome. e. Either parent, because the random mixing of gametes determines the sex of the child.
What evidence supports the theory of an early "RNA world"?
What will be an ideal response?
Approximately 95 percent of cases of cervical cancer are caused by _____.
A. cystoceles B. poor hygiene C. genetic factors D. the human papilloma virus (HPV)