The most common reportable STI in the U.S. is
A. gonorrhea.
B.
a chlamydial infection.
C. syphilis.
D. AIDS.
B.
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A plant is exposed to a toxin that blocks ABA receptor sites in the plasma membrane. What is the likely consequence of this exposure?
A. The guard cells will become flaccid and gas exchange will cease. B. ABA will enter the cells by an alternative route and normal function will be restored. C. Gibberellin production will increase, allowing the plant to access more nutrients in the soil. D. The plant will lose excess water through transpiration and suffer dehydration. E. Oxygen deprivation will trigger the release of ethylene, which will in turn suppress root growth.
Inbreeding depression, the reduction in fitness of inbred organisms, often results from the reduced level of what (within the gene pool)?
What will be an ideal response?
Each of the following is a type of RNA except
A.) carrier RNA B.) messenger RNA C.) ribosomal RNA D.) transfer RNA
In order to prevent spread of microorganisms from the microbiology laboratory, the room air should be
A. under positive pressure. B. under negative pressure. C. filtered. D. chilled. E. under negative pressure AND filtered.