The chemical components of ribosomes are proteins and ________.

A. tRNA
B. rRNA
C. DNA
D. mRNA


Answer: B

Biology & Microbiology

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Before photosynthesis evolved, _____ was a very small component of Earth's early atmosphere

a. carbon dioxide b. nitrogen c. water d. oxygen e. argon

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The gaseous plant hormone is

a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.

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What is a ribosome made of?

a. tRNA and rRNA b. tRNA, rRNA, and mRNA c. rRNA and proteins d. rRNA and mRNA

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An organism that exhibits cephalization probably also _____

A) is bilaterally symmetrical B) has a hydrostatic skeleton C) has a coelom D) is segmented E) is diploblastic

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