What is the effect of the ?32 allele of CCR5 on HIV binding?
A) appears on the surface of CD4 T cells, but the HIV virion is unable to infect the host cell
B) does not appear on the surface of CD4 T cells
C) appears on the surface of the CD4 T cells and inactivates the virion upon binding
D) interferes with binding of the virion to the CD4 receptor protein
E) appears on the surface of the CD4 T cells and causes the virion to lyse upon binding
B
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Atherosclerosis is ____
a. a clot in an artery b. buildup of plaque in an artery c. buildup of plaque in a vein d. high blood pressure e. low blood pressure
Methanogens can live only in ________ environments.
A. anaerobic B. microaerophilic C. aerobic D. All of the choices are correct.
Investigators have found a new species bacteria that lives under both aerobic and anaerobic conditions. They hypothesize that different genes are expressed in each condition. What experiment could test this hypothesis and identify important genes?
A. collect mRNA from both anaerobic and aerobic conditions and generate two cDNA libraries B. measure levels of RNA polymerase in both conditions C. design primers to a specific region of the genome and sequence this region during both anaerobic and aerobic conditions D. completely sequence the genome of the bacteria in both aerobic and anaerobic conditions
In the sigmoid growth curve, the number of individuals at any one time is indicated by what symbol?
A. N/K B. K C. dN/dt D. ri E. N