Which of the following represents one of the four major biological macromolecule classes?
a. proteases
b. hydrophilic G-proteins
c. amorphous solids
d. nucleic acids
d. nucleic acids
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Restriction enzymes cut double-stranded DNA at a specific base sequence ____
a. between genes b. and produce fragments of four to eight base pairs in length c. between bacterial and viral DNAs d. between purines and pyrimidines e. between promoter and operator DNA sequences
Compare and contrast the structure and function of ion channel-linked receptors, G protein-linked
receptors, and enzyme-linked receptors. In general, how do they differ from intracellular receptors? What will be an ideal response?
How can a lipid be distinguished from a sugar?
a. a lipid is made up of only hydrocarbons. b. lipids are mostly nonpolar. c. lipids are mostly saturated. d. a lipid dissolves in water.
According to the sliding-filament model of muscle contraction, a sarcomere contracts when its ________
A) thick filaments slide across the ends of the sarcomere B) thin filaments slide across the ends of the sarcomere C) thin and thick filaments slide further away from each other D) thin and thick filaments slide past each other to get closer together