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
Biology & Microbiology
The gaseous plant hormone is
a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.
Biology & Microbiology
What is a ribosome made of?
a. tRNA and rRNA b. tRNA, rRNA, and mRNA c. rRNA and proteins d. rRNA and mRNA
Biology & Microbiology
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
Biology & Microbiology