A hot, dry summer will reduce crop yields in part because
A) carbon dioxide release is reduced by the stomata closing to prevent excessive water loss.
B) carbon dioxide uptake is reduced by the stomata closing to prevent excessive water loss.
C) oxygen uptake is reduced by the stomata closing to prevent excessive water loss.
Answer: B
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Polyvalent vaccines using vaccinia virus are highly favored by doctors and physicians but are especially challenging for those who develop them, because
A) coat proteins form a relatively rigid structure and do not allow much space for additional proteins to be expressed. B) multiple foreign proteins simultaneously synthesized often disrupts each other's activity. C) vaccinia and most other viruses engineered for vaccines contain only one restriction site for cloning in their genome. D) virus genetic manipulation uses transfection, which is an inherently inefficient process.
How many of the 20 required amino acids can the human body synthesize?
a. none b. all c. 11 d. 7
Which of the following types of plants are incapable of self-pollination?
A) dioecious B) monoecious C) wind-pollinated D) insect-pollinated
The term "deeply branching" refers to which of the following?
A. the cellular shape of deeply branching bacteria B. the position in the evolutionary tree of deeply branching bacteria C. the ability of deeply branching bacteria to live in deep ocean waters D. the pattern of growth in culture of deeply branching bacteria