FAQ: Why is the krebs cycle a cycle?

Why is the Krebs cycle called the Krebs cycle?

The Krebs cycle is named after its discoverer, Hans Krebs. It is also known as the citric acid cycle or the tricarboxylic acid cycle.

Why is the Krebs cycle called a cycle quizlet?

Why is the citric acid cycle called a cycle? The four-carbon acid that accepts the acetyl CoA in the first step of the cycle is regenerated by the last step of the pathway. When a poison such as cyanide blocks the electron transport chain, glycolysis and the citric acid cycle also eventually stop working.

Why is the Krebs cycle necessary?

The tricarboxylic acid (TCA) cycle, also known as the Krebs or citric acid cycle, is the main source of energy for cells and an important part of aerobic respiration. The cycle harnesses the available chemical energy of acetyl coenzyme A (acetyl CoA) into the reducing power of nicotinamide adenine dinucleotide (NADH).

Why is the citric acid cycle a cyclic pathway?

Why is the citric acid cycle a cyclic pathway rather than a linear pathway? It is easier to remove electrons and produce CO2 from compounds with three or more carbon atoms than from a two-carbon compound such as acetyl CoA. Both electron transport and ATP synthesis would stop.

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Why does fermentation allow glycolysis continue?

Fermentation does not make ATP, but it allows glycolysis to continue. Fermentation removes electrons from NADH molecules and recycles NAD+ molecules for glycolysis. that allows glycolysis to continue.

Why is fad used instead of NAD+?

Step six involves oxidation of succinate (by FAD, to produce FADH2), catalyzed by succinate dehydrogenase. The oxidation reaction that makes fumarate is different in being a reaction where protons and electrons are taken away to make a double bond and for this reason, FAD is needed instead of NAD.

How many carbons must be released by the time the cycle is completed?

The two acetyl carbon atoms will eventually be released on later turns of the cycle; thus, all six carbon atoms from the original glucose molecule are eventually incorporated into carbon dioxide. Each turn of the cycle forms three NADH molecules and one FADH2 molecule.

What are the two main benefits of the citric acid cycle?

The two main purposes of the citric acid cycle are: A) synthesis of citrate and gluconeogenesis. B) degradation of acetyl-CoA to produce energy and to supply precursors for anabolism.

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