Instructions

1. As we explore the chemical reactions that occur during cellular respiration, it will be useful for you to be able to recognize the difference between an oxidation event (i.e. loss of an electron) and a deprotonation event (i.e. loss of a proton). In the enzymatic reaction shown below, both types of events occur within the substrate molecule. A cofactor of the enzyme, A, is an electron acceptor and is converted to B during the reaction. Answer the following questions about this reaction.

A. Which atom in the substrate is being oxidized?

a) the carbon is oxidized

b) the oxygen is oxidized

c) the hydrogen is oxidized

B. Which atom in the substrate is being deprotonated (i.e. only loses a proton)?

a) the carbon is deprotonated

b) the oxygen is deprotonated

c) the hydrogen is deprotonated

C. Which of the following statements describes the conversion of A to B?

a) A is oxidized to B

b) A is reduced to B

D. Which of the following molecules could A and B be?

a) A is NADH, B is NAD+

b) A is NAD+, B is NADH

c) A is FADH2, B is FAD

d) A is FAD, B is FADH2

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