A major fully reduced form of carbon, important in biogeochemical cycling is ________.

A. methane
B. hydrogen sulfide
C. carbon dioxide
D. carbohydrate


Answer: A

Biology & Microbiology

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Only 2.5% of the human genome actually codes for proteins. The other 97.5% includes:

A. noncoding RNA. B. repetitive DNA. C. introns. D. All of the answer options are correct. E. None of the answer options is correct.

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No other planet in our solar system has been confirmed to have life

a. True b. False Indicate whether the statement is true or false

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A human cell and a mouse cell were experimentally fused, and the results demonstrated that ________

a. proteins cannot move laterally in the membrane b. large polar molecules can enter cells only through transport proteins c. proteins can move laterally in the plasma membrane d. human/mouse chimeric embryos are not viable

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As the sun is setting, you notice bats coming out of a cave to begin a period of heavy activity. In the very early

morning, several days later, you notice them entering the cave to sleep. Which circadian rhythm would best explain this observation? a. crepuscular b. nocturnal c. diurnal d. lunar e. asynchronous

Biology & Microbiology