What type of mutation is seen here? Wild type: 5?-TAC AAA ATA CAG CGG-3? Mutation: 5?-TAC AAG ATA CAG CGG-3?
A) transition
B) transversion
C) insertion
D) deletion
E) nonsense
A
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Which of the following offers the best description of neural transmission across nearly all mammalian synaptic clefts?
A. Neural impulses involve the flow of K+ and Na+ across the cleft. B. Neural impulses travel across the gap as electrical currents. C. Neural impulses cause the release of chemicals that diffuse across the cleft. D. Neural impulses travel across the cleft in both directions. E. The calcium within the axons and dendrites of nerves adjacent to a synapse acts as the neurotransmitter.
Human activities are responsible for an increase in the amount of atmospheric carbon dioxide. Many feel that the buildup of this gas is at least partly responsible for the greenhouse effect and global warming. Increased carbon dioxide may actually be a benefit to some plants since they need carbon dioxide for carbon-fixation. How will the greenhouse effect influence the biosphere? Even though
experiments have shown increased carbon dioxide to be a boon for test plants, some scientists are still concerned about this phenomenon. Why? What will be an ideal response?
The spaces that separate adjacent Schwann cells are
a. neuroglia. b. myelin sheaths. c. nodes. d. dendrites. e. synapses.
Unsaturated sites in the fatty acid tails of phospholipids are places that water can use to leak through the membrane.
a. true b. false