Over time, the carbon isotope 14C decays into ____
a. 12C
b. 14N
c. 12N
d. 13C
e. 12B
ANSWER: b
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The genetic code is translated in groups of ________ bases.
A. four B. five C. two D. three
Which letter indicates the direction of incoming light in a typical vertebrate?
Vision differs from the other senses in two interesting ways. Although most sensory receptor neurons are depolarized when the receive a stimulus, rod and cone cells become hyperpolarized when they receive light. When hyperpolarized, they stop releasing inhibitory neurotransmitter and allow the bipolar cells to fire. A second unusual aspect is that the vision circuit seems to be organized "backwards" -- the light must pass through the layers of ganglion and bipolar cells to reach the rods and cones.
A. A
B. B
C. C
D. D
E. All of the directions are possible.
A study of the genomes of dogs from around the world indicated that:a
all dogs appeared to develop from a mixture of wolf and coyote. b. all dogs appeared to evolve from a mixture of the jackal and the wolf. c. all dogs appeared to evolve from a mixture of the wolf, jackal, and the coyote. d. some dogs evolved from the coyote and some from the wolf. e. the dogs’ closest relative is the gray wolf
A procedure using both reverse transcriptase and real time PCR can be used to
A. determine the number of copies of a DNA sequence in a sample. B. determine the number of copies of an RNA sequence in a sample. C. produce DNA fragments for cDNA cloning. D. both determine the number of copies of an RNA sequence in a sample and produce fragments for cDNA cloning. E. produce RNA fragments for cloning.