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Metabolic pathways

Knowledge required from other Units: from Unit 1 ­ molecules, especially carbohydrates roles of
enzymes structure of a mitochondrion.

The term metabolism refers to all the chemical reactions taking place inside cells. It includes catabolism,
where complex molecules are broken down into simple molecules with…

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Reduced electron carriers transfer their electrons to other electron carriers in an electron transport chain. In
aerobic respiration, the electrons are eventually transferred to oxygen, which is reduced to form water. As
the electrons are passed from carrier to carrier, the change from the reduced form of the carrier to…

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the cytoplasm. In yeast, pyruvate undergoes decarboxylation to form acetaldehyde, which is then reduced
by NADH + H+, forming ethanol and NAD+. Carbon dioxide and ethanol are the waste products, NAD+
is available to pick up hydrogen and there is a net gain of 2 molecules of ATP for each…

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Metabolic pathways

1. Define metabolism and explain what is meant by a metabolic pathway.

2. Give an example of a catabolic reaction that takes place inside cells. How does this type of reaction
differ from an anabolic one?

3. List as many anabolic reactions that take place in cells…


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