Each of the following could be the terminal electron acceptor in anaerobic respiration except
A) O2.
B) sulfur.
C) protons.
D) iron.
E) All could serve as the terminal electron acceptor in anaerobic respiration.
Answer: A
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The ability of DNA-binding proteins to initiate transcription can be hindered by the presence of ________ on the promoter regions of the DNA
Fill in the blank(s) with correct word
Centimeter-thin layers of earth that are rich in iridium give evidence to support the
A. allopatric theory. B. ecological isolation theory. C. gradualism theory. D. impact theory. E. punctuated equilibrium theory.
Based on what you know about mammals, which of the following sentences would you predict best describes what happened in areas where marsupial and placental mammals came into contact?
a. All placental animals went extinct. b. All marsupial animals went extinct. c. The two groups mixed with minimal competition due to their niche differences. d. Most marsupial animals went extinct. e. Most placental animals went extinct.
The layer where organisms can exist on the surface of the earth is the
(a). biosphere. (b). ecosystem. (c). population. (d). homeostasis. (e). community.