Which statement describes the role of proteins?

Which statement describes the role of proteins?

• A. They serve as building blocks of nucleic acids
• B. They are the main component of cell membranes
• C. They are substances required for structure, function and regulation of body’s cells, tissues, and organs
• D. They provide the primary energy source for cells

Answer: (C)

Proteins are essential workhorses of the body, providing structure, enabling countless functions, and regulating cellular processes. They build and support tissues (like collagen in connective tissue), act as enzymes to speed chemical reactions, serve as hormones and receptors to regulate physiology, transport substances (such as hemoglobin carrying oxygen), and defend the body as antibodies. This broad, central role in shaping how cells, tissues, and organs function and respond to the body’s needs is why this statement best describes proteins. The other ideas miss the full scope: nucleic acids are made of nucleotides, not proteins; cell membranes are primarily composed of lipids with proteins playing important but not primary roles; and the main energy source for cells is carbohydrates (with fats also providing substantial energy), with proteins only used for energy in certain conditions.

Proteins are essential workhorses of the body, providing structure, enabling countless functions, and regulating cellular processes. They build and support tissues (like collagen in connective tissue), act as enzymes to speed chemical reactions, serve as hormones and receptors to regulate physiology, transport substances (such as hemoglobin carrying oxygen), and defend the body as antibodies. This broad, central role in shaping how cells, tissues, and organs function and respond to the body’s needs is why this statement best describes proteins.

The other ideas miss the full scope: nucleic acids are made of nucleotides, not proteins; cell membranes are primarily composed of lipids with proteins playing important but not primary roles; and the main energy source for cells is carbohydrates (with fats also providing substantial energy), with proteins only used for energy in certain conditions.