practiceexam2 - PSL 431 - Cell Physiology Practice Exam 2...

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PSL 431 - Cell Physiology Practice Exam 2 1. The synthesis and processing of integral membrane proteins differs from secreted proteins in that only integral membrane proteins A. are synthesized on the endoplasmic reticulum. B. have a signal peptide. C. are segregated into a membrane bound compartment. D. require membrane fusion to achieve their final function. E. typically utilize the constitutive secretion pathway. 2. Activation of ligand-gated ion channels A. sometimes responds to voltage as well as ligand-binding. B. causes the channel to take on the inactivated state. C. usually occurs at depolarized membrane potentials. D. always involves binding of an extracellular ligand. E. occur by binding receptor antagonists. 3. Electrical synapses A. are typical of neuron-neuron synapses throughout the nervous system. B. are mediated through tight junctions between cells. C. permit membrane depolarizations to spread between cells. D. are characteristic of skeletal muscle.
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practiceexam2 - PSL 431 - Cell Physiology Practice Exam 2...

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