Which extraembryonic membrane encloses a fluid-filled sac?
a. yolk sac
b. amnion
c. chorion
d. allantois
e. umbilical cord
ANSWER: b
Biology & Microbiology
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When cancer cells have the ability to migrate to other parts of the body, they are said to be
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Rods and cones are located in the
a. lens. b. cornea. c. pupil. d. iris. e. retina.
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What was the first antibiotic, discovered as a result of a laboratory accident?
What will be an ideal response?
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The sequence of nitrogen-containing bases on one strand of DNA could determine all of the following EXCEPT the sequence of
A) nitrogen-containing bases in mRNA. B) nitrogen-containing bases in the other DNA strand. C) ribose and phosphate molecules in tRNA. D) amino acids in a protein molecule.
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