FOOD PROCESSING AND PRESERVATION
FERMENTATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It absorbs light
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It is an electron carrier
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It is a light-reflecting pigment
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It acts as long-term energy storage
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Detailed explanation-1: -It is an electron carrier used to temporarily store energy during cellular respiration. 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.
Detailed explanation-2: -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.
Detailed explanation-3: -NAD+ acts as an electron and hydrogen acceptor and NADH acts as a hydrogen and electron donor.
Detailed explanation-4: -NAD is one of the main electron carriers in redox reactions, with a unique ability to function as both a donor and an acceptor. To perform its role as an electron carrier, NAD reverts back and forth between two forms, NAD+ and NADH. NAD+ accepts electrons from food molecules, transforming it into NADH.