The human immunodeficiency virus (HIV) is an example of a retrovirus. In order to prevent incorporation of the viral DNA into the host genome, antiretroviral drugs could
A) target the viral enzyme reverse transcriptase.
B) target the viral enzyme integrase.
C) activate high levels of DNase in the cells to break down the viral DNA while it is still in the cytosol.
D) all of the above
E) none of the above
D) all of the above
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Jacob and Monod were intellectually primed to draw the conclusions they did concerning regulation of the lac operon. In part, this was due to their fascination with mechanisms of enzyme regulation. They knew that the activity of some enzymes is regulated
when their reaction product binds to the enzyme, changing its shape and, therefore, its activity. This knowledge allowed them to easily make the intellectual leap to propose _____. A) the existence of the CAP binding site B) allosteric regulation of the repressor C) positive regulation of the lac operon D) the existence of the operator E) co-transcribed and co-regulated genes of bacterial operons
The movement of carbon from CO2 in the atmosphere to HCO3 - (a byproduct of chemical weathering) on rocks to CaCO3 in coral skeletons and finally CaCO3 in limestone are all steps in the _____________
A. short-term carbon cycle B. nitrogen cycle C. sulfur cycle D. long-term carbon cycle
The sharp peak of estradiol secretion during the ovarian cycle
A. inhibits the secretion of LH and FSH. B. stimulates the secretion of LH and subsequent ovulation. C. stimulates development of the uterus. D. causes meiosis I to be completed. E. stimulates development of the uterus and causes meiosis I to be completed.
Larval development of helminths occurs in which host?
A. Larval development takes place in all hosts. B. Definitive host C. Primary host D. Transport host E. Intermediate host