The main purpose of fermentation is to regenerate NADH and FADH2
Indicate whether the statement is true or false.
ANS: F, NAD+ only
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Refer to the paragraph on the effects of estrogens in the environment
You are assigned to write the report to the Environmental Protection Agency, which needs to decide what level of 17?-estradiol to permit in sewage output. You do not want to make the level any lower than necessary, because it requires substantial additional money for the extra treatment of sewage. Given the data presented above, what level of 17?-estradiol would you suggest is safe to prevent feminization of fish? A) 2.5 ng/l B) 5 ng/l C) 12.5 ng/l D) 25 ng/l E) 100 ng/l
A compound known as X-gal is widely used in molecular genetic research. When wild-type (normal) E. coli is grown on medium containing X-gal, the bacterial colonies turn blue. In contrast, when lacZ mutants are grown on medium containing X-gal
, the bacterial colonies remain their normal white color. X-gal is likely to be a compound _____. A) chemically similar to glucose B) chemically similar to galactose C) chemically similar to lactose D) that cannot be transported into lacZ mutants E) that can be transported only into lacA mutants
Which of the following is NOT a potential reason anoxic methane-oxidizing Archaea have not also acquired the ability to reduce sulfate?
A) An individual electron acceptor such as sulfate is not always present where methane is. B) Minimizing the metabolic requirements of the archaeon's genome size provides flexibility to interact with other reducing bacteria, such as nitrate reducers. C) The archaeon-bacterium relationship yields more energy from methane oxidation/sulfate reduction when performed together than separately. D) The methane-oxidizing Archaea will not easily acquire this metabolic capability from the bacterial partner.
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.