Chapter 8, Problem 9A

Summary Introduction

Introduction :

ATP stands for adenosine triphosphate. ATP is a nucleotide. It is formed of a nitrogenous base, adenine and a pentose sugar, ribose sugar and three phosphate groups (triphosphate). Adenosine triphosphate stores energy in the terminal phosphate bond. ATP is the main molecule for storing and transferring energy in cells.

Answer to Problem 9A

Correct answer :

The correct answer is option (A) ATP.

Explanation of Solution

Explanation/justification for the correct answer :

Option (A) ATP. In both plants and animals adenosine triphosphate (ATP) is the main molecule for storing and transferring energy in cells. On hydrolysis, ATP releases energy. Thus, the correct answer is option (A).

The explanation for the incorrect answer :

Option (B) ADP. The ATP molecule splits off one of its three phosphates to become ADP (Adenosine diphosphate). It does not store and release energy. Thus, this is an incorrect option.

Option (C) NADP. NADP stands for Nicotinamide adenine dinucleotide phosphate. It is a coenzyme which participates in many redox reactions in cells. Thus, this is an incorrect answer.

Option (D) NADPH. NADPH is a reduced coenzyme of NADP. It is used to donate electrons and hydrogen to reactions catalyzed by enzymes . Thus, this is an incorrect answer.