Which of the following best describes proteins?

• A. Proteins are composed of amino acids and perform a variety of functions in the body.
• B. Proteins are composed of fatty acids and are primarily used for energy storage.
• C. Proteins are composed of monosaccharides and provide structural support.
• D. Proteins are composed of nucleotides and store genetic information.

Answer: (A)

Verified step by step guidance

1. Begin by understanding the basic building blocks of proteins. Proteins are composed of amino acids, which are organic compounds that combine to form proteins.
2. Recognize the primary functions of proteins in the body. Proteins perform a variety of functions, including catalyzing metabolic reactions, DNA replication, responding to stimuli, and transporting molecules.
3. Differentiate proteins from other macromolecules. Proteins are not composed of fatty acids, monosaccharides, or nucleotides. Fatty acids are components of lipids, monosaccharides are simple sugars, and nucleotides are the building blocks of nucleic acids.
4. Consider the role of proteins in energy storage. Proteins are not primarily used for energy storage; this is a function of lipids and carbohydrates.
5. Understand the structural role of proteins. While proteins can provide structural support, they do not do so by being composed of monosaccharides or nucleotides. Proteins like collagen provide structural support in tissues.