Hydrocarbons are organic molecules that contain only ______.

A. components found only in crude oil
B. carbon and hydrogen atoms
C. carbon atoms
D. carbon, hydrogen, and oxygen atoms


B. carbon and hydrogen atoms

Biology & Microbiology

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Most of the earth’s usable carbon is in its

a. crust. b. atmosphere. c. biomass. d. oceans. e. mantle.

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Which virus type results in the immediate onset of cancer phenotype upon infection of a host?

A) retrovirus B) acute transforming retrovirus C) lentivirus D) adenovirus

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Photosynthesizers take in carbon dioxide, whereas decomposers ________ carbon dioxide

A) yield up B) take in C) fix D) destroy

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Which of the following is mismatched?

A. somatic motor nerves-smooth muscle, cardiac muscle, glands B. sensory nerves-afferent C. motor nerves-efferent D. visceral sensory nerves-body organs E. somatic sensory nerves-skin, muscles, joints, special senses

Biology & Microbiology