Leaf abscission is initiated and orchestrated by the hormone abscisic acid. Indicate whether the statement is true or false
False - ethylene
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Nitrate (NO3-) reduced into ammonia (NH3) to produce energy for the cell is called
A) ammonification. B) dissimilative reduction of nitrate to ammonia (DRNA). C) nitrification. D) redox.
Which of the following is the most effective treatment for acquired immune deficiency syndrome (AIDS)?
A. vaccine to coat proteins B. reverse transcriptase inhibitors such as AZT C. protease inhibitors D. a combination of drugs directed at both reverse transcriptase and the HIV protease E. There is no effective treatment because the virus is always integrated into the host DNA.
Concentrations of solutes are greatest in
A) springs. B) rivers. C) lakes. D) oceans.
Vibrio cholerae lives in water and gets toxin genes from a virus by phage conversion. The toxin kills the intestinal epithelial cells in the human host, resulting in massive diarrhea. Untreated cholera has about a 50% mortality rate. How do the bacteria benefit?
A. They don't -- humans are not the main host and their symptoms are maladaptive for the bacteria. B. The bacteria reproduce faster in a dead human. C. Diarrhea helps the bacteria to spread from person to person. D. Killing humans provides nutrients for the bacteria.