How could you increase the magnitude of inhibitory postsynaptic potentials (IPSPs) generated at a synapse?
A) increase sodium-potassium pump activity
B) increase K+ permeability
C) increase the influx of calcium
D) All of the listed responses are correct.
B
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To promote the translational activity of ribosomes in human cells for synthesizing viral proteins during viral infection, viruses
A) chemically modify (e.g., cap and methylate) the transcripts. B) keep a ribosome binding site specific to human ribosomes on their genome. C) maintain introns and sometimes extrons in their genomes to appear as eukaryotic mRNA. D) only adhere to and infect metabolically active host cells where protein synthesis is high.
The fossil Lucy (Australopithecus afarensis) is significant because, at _____ years old, hers is the first species to _____
A. 20 million; have been fully bipedal B. 1.3 million; have hominin brow ridges C. 3.2 million years; be fully bipedal D. 1.3 million; migrate out of Africa E. 600,000; have homin brow ridges
Which of the following is responsible for the alpha-helical structure of proteins?
a. hydrogen bonds b. ionic interactions c. polar covalent bonds d. hydrophobic interactions e. nonpolar covalent bonds
Which of the following contributes to the the digestion of lipids?
A) pepsin B) amylase C) bile salts D) trypsin