Which of the following is a junction between two
neurons?
a. Schwann cell
b. chemical synapse
c. unsheathed node
d. sodium gate
e. all of these
Answer: b
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A eukaryotic ribosome stalled by a non-stop mutation can be rescued by:
A. nonsense-mediated mRNA decay. B. non-stop mRNA decay. C. recruitment of release factors. D. degradation of the ribosome.
What is the main benefit of identifying biodiversity hotspots?
a. Protecting endemic species b. Restoring keystone species c. Facilitating captive breeding d. Monitoring climate change
By 3.2 billion years ago, chemosynthetic cells had
become established a. near deep-sea hydrothermal vents. b. in salt lakes. c. in hot, highly acidic, fresh-water springs. d. in deep oceanic sediments. e. in the upper sunlit waters of the open oceans.
A scientist develops a new medication that is a protein compound and that must be administered by injection. Which of the following would be the most effective and safest means of preparing a sterile solution of the new medication?
A. autoclaving B. filtration C. dilution with alcohol D. lyophilization E. ultraviolet irradiation