Which of the following functional groups is associated with a release of energy when removed from the carbon skeleton with water?

• A. Amino group
• B. Sulfhydryl group
• C. Hydroxyl group
• D. Phosphate group

Answer: (D)

Verified step by step guidance

1. Understand the concept of functional groups: Functional groups are specific groups of atoms within molecules that have characteristic properties. They play a crucial role in the chemical behavior of the molecule.
2. Identify the functional groups listed: Amino group (-NH2), Sulfhydryl group (-SH), Hydroxyl group (-OH), and Phosphate group (-PO4).
3. Learn about the phosphate group: The phosphate group is known for its role in energy transfer within cells, particularly in the form of ATP (adenosine triphosphate).
4. Explore the process of energy release: When a phosphate group is removed from ATP, it releases energy that can be used by the cell for various functions. This process is known as hydrolysis.
5. Connect the concept to the question: The removal of a phosphate group from a carbon skeleton with water (hydrolysis) is associated with a release of energy, which is why the phosphate group is the correct answer.