The binding of a neurotransmitter to ligand-gated Na+ channels will cause ____ in the postsynaptic
membrane.
a. depolarization
b. hyperpolarization
c. repolarization
d. apolarization
e. depolarization and repolarization
A
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Which statement is true?
a. A cell placed in an isotonic solution will swell. b. A cell placed in a hypotonic solution will swell. c. A cell placed in a hypotonic solution will shrink. d. A cell placed in a hypertonic solution will remain the same size. e. A cell placed in a hypertonic solution will swell.
Which of the following will be found in testes and ovaries to make the steroid hormones?
a. chloroplast b. mitochondria c. rough ER d. peroxisome e. smooth ER
In the lac operon in E. coli, a nonsense mutation in the ________ gene will result in a loss of ß-galactosidase activity in the cell
A) lacZ B) lacI C) lacY D) Both A and B E) All of these
The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed. B. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins. C. the cell membrane was composed of lipids and proteins. D. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer.