Which of the following is not found in the cytoskeleton?
A. intermediate filaments
B. spindle fibers
C. actin filaments
D. microfilaments
E. none of the above
B. spindle fibers
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The operation of a synapse
a. results from the passage of an electrical charge across the gap. b. involves a transmitter substance from vesicles in the presynaptic neuron that acts upon a receptor site in the postsynaptic neuron. c. occurs only between two nerves. d. is limited only by the action of acetylcholinesterase. e. requires neurotransmitter to pass directly through the plasma membrane of a postsynaptic nerve.
Alternate forms of the same gene
A. do not exist. B. are alleles. C. are homologs. D. are sister chromatids. E. do not occur in the same individual.
The group of biological molecules that are most diverse in function is
A) nucleic acids. B) lipids. C) proteins. D) carbohydrates.
Where does photosynthesis take place ineukaryotic cells?
a) Mitochondria b) Ribosomes c) Chloroplasts d) Lysosomes