Which of the following statements correctly explains what it means for DNA replication to be bidirectional?
(a) The replication fork can open or close, depending on the conditions.
(b) The DNA replication machinery can move in either direction on the template strand.
(c) Replication-fork movement can switch directions when the fork converges on another replication fork.
(d) The replication forks formed at the origin move in opposite directions.
(d)
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How is ATP made by an acetogen during CO2 fixation?
A) Electrons from metal cofactors energize the electron transport chain and drive the proton motive force to activate ATP synthase. B) Substrate-level phosphorylation of ADP occurs when coenzyme A is removed from acetyl-CoA. C) It is made by substrate-level phosphorylation and a Na+-translocating ATPase. D) The energized CO-CH3 complex during thioesterification drives a Na+-translocating ATPase.
Four of the five answers listed below are related by a similar source. Select the exception
a. prolactin b. progesterone c. androgen d. estrogen e. testosterone
The primitive earth's atmosphere did NOT contain
a. water vapor. b. free nitrogen. c. free hydrogen. d. free oxygen. e. inert gases.
You conducted an experiment to investigate whether termites demonstrated orientation behavior. You noticed that termites were attracted to black ink after some preliminary observations. You hypothesized that termites were attracted to a chemical in black ink. which of the following setups provide best control to your hypothesis?
A. Black pen line vs. Blue pen line B. Black pen line vs. indentation made by wood stick C. Black pen line vs. blank paper D. Black pen line vs. Black pencil line