The best definition of ATP is that it is
a. A molecule stored for food use.
b. A molecule that supplies energy to do work.
c. A molecule stored for an energy reserve.
d. A molecule used as a source of phosphate.

Verified step by step guidance

Step 1: Understand what ATP stands for. ATP is Adenosine Triphosphate, a molecule found in all living cells.

Step 2: Recall the primary role of ATP in cellular processes. ATP is known as the energy currency of the cell because it stores and supplies energy for many biochemical reactions.

Step 3: Analyze each option in the question: (a) suggests ATP is stored for food use, which is incorrect because ATP itself is not stored as food; (b) states ATP supplies energy to do work, which aligns with its known function; (c) implies ATP is stored as an energy reserve, but ATP is actually produced and used quickly rather than stored; (d) says ATP is used as a source of phosphate, which is partially true but not its main defining role.

Step 4: Conclude that the best definition focuses on ATP's role in supplying energy to perform cellular work, making option (b) the most accurate.

Step 5: Remember that ATP releases energy when its phosphate bonds are broken, which powers various cellular activities such as muscle contraction, active transport, and biosynthesis.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

ATP as an Energy Carrier

ATP (adenosine triphosphate) is the primary energy carrier in cells, providing energy for various biological processes by releasing a phosphate group through hydrolysis.

Energy Storage vs. Energy Transfer

Unlike long-term energy storage molecules like fats or glycogen, ATP is not stored in large amounts but is continuously regenerated and used to transfer energy quickly within the cell.

Role of Phosphate Groups in ATP

ATP contains three phosphate groups; the bonds between these phosphates store potential energy, and breaking these bonds releases energy that powers cellular work.

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Related Practice

Textbook Question

The artificial sweetener aspartame, or NutraSweet®, is made by joining aspartic acid to methylated phenylalanine, as shown in the following.

a. What types of molecules are aspartic acid and phenylalanine?

b. What direction is the hydrolysis reaction (left to right or right to left)?

c. What direction is the dehydration synthesis reaction?

d. Circle the atoms involved in the formation of water.

e. Identify the peptide bond.