Which of the following is not true of conjugation?
A. transfers genes for drug resistance
B. transfers genes for a polysaccharide capsule
C. involves direct contact between cells
D. transfers genes for enzymes and adherence molecules
E. The donor retains a copy of the transferred genes.
Answer: B
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In salt marshes, only a small portion of primary production is consumed by herbivores
Indicate whether the statement is true or false
Which set of values would result in a population with a growth rate of zero?
a. b = 1000, d = 500, i = 750, e = 1000 b. b = 1000, d = 500, i = 1000, e = 1000 c. b = 1000, d = 500, i = 1500, e = 1000 d. b = 1000, d = 500, i = 0, e = 1000 e. b = 1000, d = 500, i = 500, e = 1000
Which one of the following would have the greatest genetic diversity?
A. an organism B. a population C. a species D. All could have similar genetic diversity.
How is the renal tubule excretion of ammonia involved in maintaining the acid-base balance?
A) An increase in blood pH accelerates tubule excretion of both hydrogen and ammonia. A decrease in blood pH produces the opposite effects, thus maintaining pH balance. B) A decrease in blood pH accelerates tubule excretion of both hydrogen and ammonia. An increase in blood pH produces the opposite effects, thus maintaining pH balance. C) Renal tubule excretion of ammonia causes the combining of hydrogen to form ammonium ions that decrease the blood bicarbonate buffer pair ratio. D) Ammonia excreted by renal tubules has no effect on acid-base balance.