Enzyme Characteristics in Metabolic Pathways

Steps:

• Enzymes are proteins that catalyze reactions, and all proteins are globular to function in aqueous environments.
• Statement 1 is true: All enzymes in the pathway are globular proteins by definition.
• Statement 2 is false: Each enzyme has a unique tertiary structure specific to its substrate and reaction.
• Statement 3 is true: All proteins, including enzymes, contain hydrogen atoms in their amino acid structures.

Why C is correct: Enzymes are proteins with defined structures; globular shape enables solubility and function, while hydrogen is a fundamental element in all organic molecules like proteins (per biochemical composition).

Why the others are wrong:

• A: Includes false statement 2 about identical tertiary structures.
• B: Omits true statement 3 about hydrogen content.
• D: Ignores true statements 1 and 3.

Final answer: C