Archaeal and Bacterial pili are identical in structure and function.
Answer the following statement true (T) or false (F)
False
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The acetylcholine receptor is
A. a ligand-gated ion channel that produces depolarization by allowing Na+ ions to enter the muscle fiber. B. a ligand-gated ion channel that produces hyperpolarization by allowing Na+ ions to enter the muscle fiber. C. a ligand-gated ion channel that produces depolarization by allowing Cl- ions to enter the muscle fiber. D. a ligand-gated ion channel that produces depolarization by allowing K+ ions to leave the muscle fiber. E. a metabotropic receptor that stimulates muscle activity by activating second messenger systems within the muscle fiber.
A plant cell with three sets of chromosomes has a ploidy that is
a. haploid. b. diploid. c. triploid. d. tetraploid. e. hexaploid.
The active ingredient in Ecstacy works by
a. binding to active transporters in brain neuron membranes. b. blocking the movement of neurotransmitters across synapses c. binding to neuroreceptors on the ends of neurons d. stopping signal transmissions down the length of an axon e. inhibiting the release of neurotransmitters at the synaptic junction
Which of the following is a characteristic of the cell membrane?
a. impermeable b. semipermeable c. fully permeable d. not permeable