Imagine you were working on a vaccine against HIV viruses. Which part of the virus particle would you try to target as an epitope for the vaccine?
a. the part that shows the strongest positive selection
b. the part that interacts with the host immune system
c. the part with the highest mutation rate
d. the part that shows the strongest purifying selection
D
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Most human embryos that are aneuploid
A. result in Down's syndrome. B. result in sterility. C. are spontaneously aborted in the first trimester. D. can develop and survive to adulthood. E. are usually the result of increased nondisjunction in the gametes of older men.
Once food is digested, the nutrients must be absorbed by the epithelial cells that line the specialized portions of the alimentary canal. Small, hydrophobic molecules can diffuse down concentration gradients across the membrane. What types of molecules would require ACTIVE TRANSPORT in order to get across?
_____ minerals _____ water _____ monoglycerides _____ amino acids _____ salt
Natural selection was independently proposed as a means of evolution by Darwin and
A. Wallace. B. Lamarck. C. LeClerc. D. Lyell.
Small, nonterritorial male marine iguanas typically have their mating interrupted by larger males prior to ejaculation. What alternative mating strategy have these small males developed to compensate for this?
A) Small males form coalitions and distract larger males to allow enough time for copulation. B) Small males induce ejaculation prior to copulation, and store the ejaculate in their cloacal pouches. C) Small males have developed the ability to induce ejaculation much more quickly than large males. D) Small males have developed sperm that are more efficient at fertilization than the sperm of larger males.