In DNA the pyrimidines are
a. thymine and cytosine.
b. adenine and cytosine.
c. adenine and guanine.
d. thymine and adenine.
e. guanine and thymine.
A
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The Nef protein helps HIV evade the adaptive immune system by____
a. destroying cytotoxic T cells b. destroying class I MHC proteins present on the surface of infected cells c. destroying class I MHC proteins in the cytoplasm d. binding to class I MHC proteins at the cell surface, thereby blocking their availability to cytotoxic T cells e. binding to class I MHC proteins and preventing their transport to the cell surface
Why would the Sabin oral polio vaccine need to be eliminated as we get closer and closer to eradication of the polio virus?
A. Since it is a live, attenuated viral vaccine, there's always the chance it could revert back into a pathogenic state by mutation. This would introduce new strains still capable of causing the illness into human populations, thwarting elimination. B. The Sabin vaccine is cheaper than the Salk (killed virus) vaccine, but it isn't as effective at producing a protective response. We'll need to shift to the more effective Salk vaccine worldwide eventually to complete the eradication process. C. The Salk vaccine is far cheaper than the Sabin vaccine. To effectively eradicate polio, we'll need to shift all of our resources into the cheapest and easiest to deliver vaccine possible. That is the Salk vaccine. D. The Sabin vaccine can only be administered to human beings. We need to vaccinate bird populations as well to effectively control the spread of polio. Birds are a natural reservoir for the virus.
How many enzyme pathways are shared between gluconeogenesis and the Embden-Meyerhof pathway?
A. 11 B. 6 C. 3 D. 8
Pressure flow involves
a. sugar transported in phloem. b. sugar transported in xylem. c. water transported in phloem. d. water transported in xylem