In an aqueous environment, how are the phospholipids of a membrane arranged?
a. in a single layer
b. in a bilayer, with the fatty acid tails located at the surface
c. in a bilayer, but the phospholipids have no specific orientation
d. in a bilayer, with the polar heads of each layer located at the surface
Answer: d. in a bilayer, with the polar heads of each layer located at the surface
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In modern proteomic analysis the amino acid sequence of a protein can be determined by
A. two-dimensional gel electrophoresis. B. analysis using protein chips with appropriate probes. C. mass spectrometry. D. determining its nucleotide sequence.
In sarcomers, phosphate-group transfers from ATP activate _____
a. actin c. both b. myosin d. neither
Which mutation in DNA would lead to the change of a single amino acid in a protein?
A. a frameshift B. a missense mutation C. a nonsense mutation D. one base insertion E. one base deletion
Two types of polygamy are:
a. kin selection and reciprocal altruism. b. polygyny and polyandry. c. polygyny and monogamy. d. internal and external. e. isogamy and anisogamy.