ObjectiveMcq
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What is the functional region of the tertiary and quaternary structure of the protein called?
Correct Answer: C — Active site
Because of secondary and tertiary structures, proteins adopt specific shapes. The spot at which two molecules with specific shapes fit together to interact is called the active site. This active site is the basis of the lock and key model. The active site is called active because interaction of the molecules in this way usually results in some chemical change or reaction.