Zhang and Cech’s experiments confirmed what feature of ribozyme activity?
a. Ribozymes inhibit rates of biological
reactions.
d. Ribozymes can link amino acids together
even if their proteins are removed.
b. Ribozymes catalyze formation of the
fundamental linkage tying amino acids
together in proteins.
e. Ribozymes provide the possible solution
of whether proteins or nucleic acids come
first in evolution.
c. Ribozymes catalyze formation of the
fundamental linkage tying nucleic acids to
proteins.
B
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The prokaryote operon model explains gene
regulation at the level of a. replication. b. transcription. c. transcript processing. d. transcript transport. e. translation.
The damage caused by ultraviolet radiation is
A) Repaired during transcription. B) Never repaired. C) Cut out and replaced. D) Repaired by DNA replication. E) Repaired during translation.
Which of the following is a major distinction between a transposon and a retrotransposon?
a) A retrotransposon always uses the copy-paste mechanism, while a transposon uses cut and paste mechanism. b) A transposon is related to a virus and a retrotransposon is not. c) A transposon moves via a DNA intermediate and a retrotransposon via an RNA intermediate. d) A transposon always leaves a copy of itself at its original position and a retrotransposon does not. e) The positioning of a transposon copy is transient while that of a retrotransposon is permanent.
Fungi ________.
A. produce chlorophyll under aerobic conditions and are prokaryotes or eukaryotes, depending on the species B. produce chlorophyll under aerobic conditions C. are prokaryotes or eukaryotes, depending on the species D. are eukaryotic organisms