Which mechanism of horizontal gene transfer relies on the use of viruses?
A) conjugation
B) mutation
C) transduction
D) transformation
Ans: C) transduction
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In vertebrates, DNA methylation - the addition of a methyl group to DNA nucleotides - ensures that
A. the gene functions without interruption. B. no errors will be made during transcription. C. the nucleosome will quickly form, which assists in mRNA formation. D. once that gene is transcribed, the mRNA is saved and used over and over again. E. once a gene is turned off, it will remain off.
When riding a horse, a jockey squeezes his thighs together to stay on the saddle. This is an example of ____
a. flexion b. extension c. abduction d. adduction e. pronation
The brain can infer the pitch of a sound from the:a
number of hair cells that are stimulated. b. particular hair cells that are stimulated. c. intensity with which the hair cells are stimulated. d. intensity of the action potential produced by the stimulated hair cells. e. fluid movements of the semicircular canals.
The domain_________ does not include prokaryotes.
Fill in the blank(s) with the appropriate word(s).