The movement of water up the stems of tall plants is least dependent on which of the following factors?
A. Root pressure
B. Transpiration
C. Cohesion of water molecules
D. Water tension within the xylem
Ans: A. Root pressure
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The HIV genome is especially prone to mutation because
A. it is made of DNA. B. it is an emerging virus. C. it is copied by reverse transcriptase, which lacks a proofreading function D. of the many different drugs HIV patients must take.
A salt is a compound in which the hydrogen ion of ____ is replaced by some other cation
a. water b. a base c. an acid d. an anion e. a hydroxide ion
Marina has owned a bar for many years and extols the health benefits of alcohol. Which of these claims is correct?
A) Moderate consumption raises the "good" cholesterol levels. B) Heavy drinking prevents cancer. C) Four to five drinks per day improve the liver. D) Alcohol increases the uptake of vitamins and minerals.
The rod and cone cells are located within which layer of the eye?
A. retina B. choroid C. lens D. iris E. sclera