In competitive inhibition, the ____
a. products block the active site of the enzyme
b. products bind to a site other than the active site of the enzyme and block enzyme activity indirectly
c. substrate and cofactors compete for the active site
d. inhibitor binds to and directly blocks the active site of the enzyme
e. inhibitor binds to the enzyme at a site other than its active site
ANSWER: d
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Attenuation occurs in a laboratory, because
A) nonvirulent or weakly virulent mutants grow faster in vitro in laboratory media. B) pathogens lose virulence with age. C) patients are generally treated with drugs that induce attenuation. D) None of the answers are correct.
Which of the following statements regarding viremia is incorrect?
A. Droplet transmission of viruses like the measles virus results in viremia. B. The variola virus multiplies in white blood cells, and cell lysis results in viremia. C. HHV-3 is disseminated to the skin by viremia. D. Shingles is a manifestation of persistent viremia after a course of chicken pox.
The master gene Hox helps to sculpt the body plan of embryos by ____
a. inhibiting the Dlx gene to prevent extra limbs b. timing the activation of Dlx genes c. causing cell death in any cell not expressing the Hox gene d. converting sugar into energy to allow the process to go to completion e. inducing mutations in plants
____________________ is an abnormal change in the shapes, sizes, and organization of cells in a tissue. Fill in the blank(s) with the appropriate word(s)