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1a) A reaction in carbohydrate metabolism occurs where glucose-6-phosphate react

ID: 814078 • Letter: 1

Question

1a) A reaction in carbohydrate metabolism occurs where glucose-6-phosphate reacts with NADP+ to give 6-phosphoglucono-?-lactone and NADPH. Which substance is oxidized, reduced? Which is the oxidizing agent and which is the reducing agent?

1b) A biochemical reaction transfers 60 kJ/mol of energy. WHat general process most likely would be involved in this transfer? What cofactor (or cosubstrate) likely would be used? Which cofactor probably would not be used?

1a) A reaction in carbohydrate metabolism occurs where glucose-6-phosphate reacts with NADP+ to give 6-phosphoglucono-?-lactone and NADPH. Which substance is oxidized, reduced? Which is the oxidizing agent and which is the reducing agent? 1b) A biochemical reaction transfers 60 kJ/mol of energy. WHat general process most likely would be involved in this transfer? What cofactor (or cosubstrate) likely would be used? Which cofactor probably would not be used?

Explanation / Answer

During carbohydrate metabolism glucose-6-phosphate reacts with NADP+ to give 6-phosphoglucono-?-lactone and NADPH. Here glucose-6-phosphate is oxidised and NADP+ is reduced.

An oxidizing agent is the element or compound in an oxidation-reduction reaction that accepts an electron from another species. Because the oxidizing agent is gaining electrons, it is said to have been reduced. So here NADP+ is oxidising agent.

A reducing agent is an element or compound that loses an electron to another chemical species in a redox chemical reaction. Since the reducing agent is losing electrons, it is said to have been oxidized. Here glucose-6-phosphate is a redusing agent.

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