SCIENCE
RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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it delivers its electron load to the first electron carrier molecule
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it is reduced to form NAD+
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it is chemically converted into ATP
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it acts as the final electron acceptor
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Detailed explanation-1: -Answer and Explanation: During cellular respiration, NADH delivers its electron “cargo” to the first electron transport chain protein complex and is d. reduced to form NAD+ N A D + . NADH is formed in glycolysis, beta-oxidation of fats and in the citric acid cycle.
Detailed explanation-2: -NADH provides electrons for aerobic ATP production. In cells deprived of oxygen or with impaired electron transport chain activity, NADH accumulation can be toxic. To minimize such toxicity, elevated NADH inhibits the classical NADH-producing pathways: glucose, glutamine, and fat oxidation.
Detailed explanation-3: -Electrons from NADH enter the electron transport chain in complex I, which consists of nearly 40 polypeptide chains (Figure 10.8). These electrons are initially transferred from NADH to flavin mononucleotide and then, through an iron-sulfur carrier, to coenzyme Q-an energy-yielding process with G°´ =-16.6 kcal/mol.
Detailed explanation-4: -Then NADH, along with another molecule flavin adenine dinucleotide (FADH2) will ultimately transport the electrons to the mitochondria, where the cell can harvest energy stored in the electrons.