Active site formation in tertiary structure

Steps:

• Identify that globular proteins like enzymes catalyze reactions via their tertiary structure's 3D shape.
• Recognize the active site as a pocket where substrate binds, formed by specific amino acid R groups.
• Eliminate options not directly enabling catalysis: A misstates hydrophobic positioning; C confuses denaturation; D describes a structural feature but not the catalytic property.
• Confirm B as the key interaction for substrate binding and reaction facilitation.

Why B is correct:

• The tertiary structure positions R groups to form the active site, allowing specific bonds with substrate for catalysis, per enzyme-substrate complex theory.

Why the others are wrong:

• A: Hydrophobic R groups are typically inside the protein, not outside, to stabilize the core in aqueous environments.
• C: High temperatures denature proteins, disrupting structure, not donating properties.
• D: Hydrogen bonding maintains overall shape but does not directly enable substrate interaction.

Final answer: B