Question

which three statements best describe proteins? a. proteins aid in chemical reactions. b. proteins are long, folded chains of amino acids. c. proteins are bonded together to form simple sugars. d. the shape of a protein molecule determines its function. e. proteins can be used for long-term energy storage. f. the type of protein depends on the functional group.

Explanation:

• Option A: Enzymes (a type of protein) act as catalysts to aid in chemical reactions, so this is correct.
• Option B: Proteins are polymers made of long, folded chains of amino acids linked by peptide bonds, so this is correct.
• Option C: Simple sugars are carbohydrates, not formed from proteins, so this is incorrect.
• Option D: The specific 3 - D shape (conformation) of a protein determines its function (e.g., enzyme specificity, structural roles), so this is correct.
• Option E: Lipids (like fats) are used for long - term energy storage, not proteins (proteins are for structure, enzymes, transport, etc., and only used for energy in emergencies), so this is incorrect.
• Option F: The type of protein depends on the sequence and arrangement of amino acids, not functional groups (functional groups are more relevant to small organic molecules), so this is incorrect.

Answer:

A. Proteins aid in chemical reactions.
B. Proteins are long, folded chains of amino acids.
D. The shape of a protein molecule determines its function.