Halobacterium salinarum and certain other extreme halophiles carry out light-driven synthesis of ATP under what condition?

A) low oxygen concentrations
B) low light
C) high oxygen concentrations
D) high carbon dioxide concentrations


Answer: A

Biology & Microbiology

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Balanced polymorphism is a type of

a. disruptive selection. b. sexual selection. c. directional selection. d. reproductive isolation. e. stabilizing selection.

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About 75% of the Earth's surface is covered by

A) water. B) bare ground. C) forest. D) grassland.

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The insects in the diagram above represent all of the following except 



A. herbivores.
B. the second trophic level.
C. primary consumers.
D. producers.

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The measure of how blood glucose levels are affected by a given amount of carbohydrate is:

A) monosaccharide ratio. B) sugar input. C) insulin index. D) glycemic load.

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