To test the hydrogen-bond hypothesis for reduced affinity of the heme group for carbon monoxide
when the heme is associated with polypeptide chains, the researchers used which of the following
model systems?
a. Mutated rat myoglobin.
b. Mutated rat hemoglobin.
c. Myglobin gene isolated from a bacteria and introduced into sperm whale.
d. Myglobin gene isolated from a sperm whale and introduced into a bacteria.
e. Hemoglobin gene isolated from a sperm whale and introduced into a bacteria.
D
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Ig stands for __________. Fill in the blank(s) with the appropriate word(s)
Both smooth muscle fibers and cardiac muscle fibers:a
have striations. b. are under involuntary control. c. are multinucleate. d. have a comparable intermediate resistance to fatigue. e. have a comparable intermediate speed of contraction.
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.
The main function of an earthworm's gizzard is to
A) moisten food. B) store food. C) absorb food. D) grind food.