Question

In which process(es) are electron carriers reduced? options:

Both Lactic acid fermentation and Citric acid cycle

Neither Lactic acid fermentation nor Citric acid cycle

Citric acid cycle in mitochondria

Lactic acid fermentation

Answer 1

Answer:-

The correct option is third one i.e Citric acid cycle in mitochondria. If we talk about Lactic acid fermentation, this process takes place in microorganisms and in some cells of the muscle. In this process, NADH is the electron carrier which gets oxidized into NAD+ in order to produce energy in the form of ATP through glycolysis in lower oxygen conditions and pyruvate gets reduced into lactic acid or lactate by NADH and the muscle soreness is due to the lactic acid when it starts accumulated in muscles of the body whereas, citric acid cycle have NADH and as electron carriers. Three NAD+ molecules reduced into NADH and one FAD molecule reduced into FADH2. These electron carriers are produced from reduction-oxidation reactions in citric acid cycle. For instance, When citric acid cycle consumes acetyl CoA and which results in the reduction of NAD+ into NADH and production of CO2 as a byproduct. The electrons from this NADH is later used in electron transport chain.

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