If autophosphorylation of CheA protein does not occur, then Escherichia coli cells must be
A. rotating flagella clockwise.
B. tumbling.
C. in a gradient of a chemorepellant.
D. in a gradient of a chemoattractant.
Answer: D
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What is a carpel?
A. The pollen-producing reproductive structure B. The structure that contains filaments and anther C. The endosperm that provides nourishment to the embryo D. The egg-producing reproductive structure
During stressful times, the adrenal glands increase their secretion of _____
a. iodine c. cortisol b. antidiuretic hormone d. secretin
The structure labeled "A" is the
a. aorta. b. inferior vena cava. c. pulmonary artery. d. pulmonary vein. e. superior vena cava
A compound that could not have been present in the early atmosphere, because it is quite reactive and
would have broken down organic molecules that were a necessary step in the origin of life on Earth, is: a. oxygen. b. sulfur dioxide. c. hydrogen sulfide. d. carbon dioxide. e. sodium chloride.