What is the function of protein?

• A. Cell production, tissue growth and repair, enzymes-hormones-and-antibody production, and provides energy.
• B. Energy production only
• C. Storage of minerals only
• D. Transmission of neural impulses

Answer: (A)

Proteins act as the body's builders and regulators. They provide the essential building blocks for cell production, tissue growth and repair, helping support muscles, organs, skin, and other tissues. They also form the functional molecules that keep the body running: enzymes to speed up reactions, hormones to regulate processes, and antibodies to defend against infections. In addition, if carbohydrate and fat are in short supply, proteins can be used for energy. This combination of structural, catalytic, regulatory, and emergency energy roles makes the described answer the best fit. The other options are too limited or describe functions not primarily carried out by proteins.