
(a)
Interpretation: To classify each of the following molecules as (1) an oxidizing agent, (2) a reducing agent, or (3) neither an oxidizing agent nor a reducing agent.
a. NADH
b. ATP
c. FAD
d. CoA–SH
Concept introduction: The sum of various
ATP is a
Flavin adenine dinucleotideexists in two forms: oxidized form
Coenzyme A (CoA) is a coenzyme which is utilized in various metabolic reactions. The functions of coenzyme A include oxidation of pyruvate in the citric cycle and fatty acid oxidation.
Oxidizing agents are those species which gets reduced and oxidizes the other species present in the chemical reaction. Reducing agent is those species which gets oxidized and reduces the other species present in a chemical reaction. Generally, oxidizing agents are electron acceptor and reducing agents are electron donor.
(a)

Answer to Problem 23.44EP
Explanation of Solution
Nicotinamide adenine dinucleotide exists in two forms:
Here
(b)
Interpretation: To classify each of the following molecules as (1) an oxidizing agent, (2) a reducing agent, or (3) neither an oxidizing agent nor a reducing agent.
a. NADH
b. ATP
c. FAD
d. CoA–SH
Concept introduction: The sum of various chemical reactions occurring in the human body is called metabolism and the reactions individually are known as metabolic reactions. During these metabolic reactions, the various metabolic intermediates are formed for the short time to complete the reactions.ATP,
ATP is a nucleotide which provides energy for the completion of various metabolic reactions occurring in our human body. The structure of ATP consists of adenine base, ribose sugar unit and the three phosphate groupconnected to each other by phosphoanhydride bonds.
Flavin adenine dinucleotideexists in two forms: oxidized form
Coenzyme A (CoA) is a coenzyme which is utilized in various metabolic reactions. The functions of coenzyme A include oxidation of pyruvate in the citric cycle and fatty acid oxidation.
Oxidizing agents are those species which gets reduced and oxidizes the other species present in the chemical reaction. Reducing agent is those species which gets oxidized and reduces the other species present in a chemical reaction. Generally, oxidizing agents are electron acceptor and reducing agents are electron donor.
(b)

Answer to Problem 23.44EP
ATP molecule is neither a reducing agent nor an oxidizing agent in metabolic reactions.
Explanation of Solution
Adenosine triphosphate (ATP) is anucleotide which structural component is one unit of the adenine base, one unit of ribose sugar and three units of a phosphate group. It can be converted into its monophosphate form(AMP) and diphosphate form(ADP) by losing a phosphate group. The reaction to this change is:
Here ATP is not involved in electron transfer hence it is neither a reducing agent nor an oxidizing agent.
(c)
Interpretation: To classify each of the following molecules as (1) an oxidizing agent, (2) a reducing agent, or (3) neither an oxidizing agent nor a reducing agent.
a. NADH
b. ATP
c. FAD
d. CoA–SH
Concept introduction: The sum of various chemical reactions occurring in the human body is called metabolism and the reactions individually are known as metabolic reactions. During these metabolic reactions, the various metabolic intermediates are formed for the short time to complete the reactions.ATP,
ATP is a nucleotide which provides energy for the completion of various metabolic reactions occurring in our human body. The structure of ATP consists of adenine base, ribose sugar unit and the three phosphate groupconnected to each other by phosphoanhydride bonds.
Flavin adenine dinucleotideexists in two forms: oxidized form
Coenzyme A (CoA) is a coenzyme which is utilized in various metabolic reactions. The functions of coenzyme A include oxidation of pyruvate in the citric cycle and fatty acid oxidation.
Oxidizing agents are those species which gets reduced and oxidizes the other species present in the chemical reaction. Reducing agent is those species which gets oxidized and reduces the other species present in a chemical reaction. Generally, oxidizing agents are electron acceptor and reducing agents are electron donor.
(c)

Answer to Problem 23.44EP
Explanation of Solution
Flavin adenine dinucleotide exists in two forms:
Here
(d)
Interpretation: To classify each of the following molecules as (1) an oxidizing agent, (2) a reducing agent, or (3) neither an oxidizing agent nor a reducing agent.
a. NADH
b. ATP
c. FAD
d. CoA–SH
Concept introduction: The sum of various chemical reactions occurring in the human body is called metabolism and the reactions individually are known as metabolic reactions. During these metabolic reactions, the various metabolic intermediates are formed for the short time to complete the reactions.ATP,
ATP is a nucleotide which provides energy for the completion of various metabolic reactions occurring in our human body. The structure of ATP consists of adenine base, ribose sugar unit and the three phosphate groupconnected to each other by phosphoanhydride bonds.
Flavin adenine dinucleotideexists in two forms: oxidized form
Coenzyme A (CoA) is a coenzyme which is utilized in various metabolic reactions. The functions of coenzyme A include oxidation of pyruvate in the citric cycle and fatty acid oxidation.
Oxidizing agents are those species which gets reduced and oxidizes the other species present in the chemical reaction. Reducing agent is those species which gets oxidized and reduces the other species present in a chemical reaction. Generally, oxidizing agents are electron acceptor and reducing agents are electron donor.
(d)

Answer to Problem 23.44EP
Coenzyme A (CoA–SH) molecule is neither a reducing agent nor an oxidizing agent in metabolic reactions.
Explanation of Solution
Coenzyme A (CoA) is a coenzyme whose structure is based on the B vitamin pantothenic acid. Its structure consists of three subunits: 2-Aminoethanethiol, pantothenic acid, and phosphorylated ADP.
Coenzyme A is always in equilibrium with its acetyl form and therefore helps in transfer of acetyl group in metabolic reaction. The reaction for this change is
Here Coenzyme A (CoA) is not involved in electron transfer hence it is neithera reducing agent nor an oxidizing agent.
a.
b. ATP molecule is neither a reducing agent nor an oxidizing agent in metabolic reactions.
c.
d. Coenzyme A (CoA–SH) molecule is neither a reducing agent nor an oxidizing agent in metabolic reactions.
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Chapter 23 Solutions
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