In the lock and key model of enzyme activity, the substrate acts as the:
Correct answer: A. Key
- A. Key
- B. Lock
- C. Both A and B
- D. None of the above.
Explanation
The substrate is the key whose shape fits the lock of the enzyme. The substrate is held in place by temporary bonds which form between the substrate and some of the R groups of the enzyme's amino acids. This combined structure is termed the enzyme-substrate complex.
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About Enzymes
Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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