PHYSIOLOGY
MUSCLE ENERGETICS GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Donor
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Acceptor
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Either A or B
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None of the above
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Detailed explanation-1: -This is found in two forms in cells: NAD+ is an oxidizing agent – it accepts electrons from other molecules and becomes reduced. This reaction forms NADH, which can then be used as a reducing agent to donate electrons. These electron transfer reactions are the main function of NA D + .
Detailed explanation-2: -NAD+ is an electron carrier because it carries the electrons of a hydride from one region of a cell to another.
Detailed explanation-3: -NADH is a strong electron donor: because its electrons are held in a high-energy linkage, the free-energy change for passing its electrons to many other molecules is favorable (see Figure 14-9). It is difficult to form a high-energy linkage. Therefore its redox partner, NAD+, is of necessity a weak electron acceptor.