If you were given a bacterial strain with a mutation in the promoter region of the trp operon the most likely effect would be
A. lack of expression of just the first gene in the operon.
B. interference with RNA polymerase binding.
C. enabling the trp operon to be expressed in the absence of tryptophan.
D. derepression of the trp operon.
E. to block the repressor from binding.
Answer: B
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Which of the following statement about the plasma membrane Na+/K+-ATPase pump is INCORRECT?
A. It is used to generate sodium and potassium gradients across the membrane. B. It is an electrogenic pump. C. It is a pump for active transport of K+ out of the cell and Na+ into the cell. D. It is a pump for active transport of K+ into the cell and Na+ out of the cell. E. It is a pump that utilizes energy from ATP.
Compared to humans, koalas ingest a relatively large amount of
a. water. b. protein, which can be hard on their kidneys. c. essential fatty acids. d. sodium. e. toxic terpene oils.
Which of the following posits that the metabolic reactions that led to the first cells took place on the porous surface of iron-sulfide-rich rocks at hydrothermal vents?
A. Hydrothermal vent hypothesis B. Iron–sulfur world hypothesis C. RNA world hypothesis D. Ribozyme hypothesis E. Protoevolutionary hypothesis
A white cow was mated with a red cow, and they had an offspring who was roan-the calf had an even mixture of white hairs and red hairs covering her body. What is the most likely explanation of the inheritance of the roan coat?
A. incomplete dominance B. red is dominant and white is recessive C. pleiotropy D. X-linked dominance E. red and white are codominant