What enzyme catalyzes the attachment of amino acids to tRNA molecules?
A. helicase
B. topoisomerase
C. aminoacyl-tRNA synthetase
D. ribosome
E. translation factor
C. aminoacyl-tRNA synthetase
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Which of the following is NOT promoted by the
active form of phytochrome? a. seed germination b. root growth c. leaf expansion d. stem branching e. none of these
In the experiments of Griffith, the conversion of nonlethal R-strain bacteria to lethal S-strain bacteria:a
was the result of genetic mutation. b. was an example of the genetic exchange known as transformation. c. supported the case for proteins as the genetic material. d. could not be reproduced by other researchers. e. was an example of conjugation.
Which situation would allow gene expression to continue?
A) X-chromosome inactivation B) an increase in proteases C) an increase in repressor proteins D) a reduction in nucleases
One theory holds that the first self-replicating molecules were
A) carbohydrates. B) lipids. C) RNA. D) DNA. E) amino acids.