The active site on an enzyme:
Correct answer: D. Determined by structure and the specificity of the enzyme
- A. Never changes
- B. Forms no chemical bond with substrate
- C. Is non-specific in its action
- D. Determined by structure and the specificity of the enzyme
Explanation
Enzymes are proteins, and their function is determined by their complex structure.The reaction takes place in a small part of the enzyme called the active site, while the rest of the protein acts as a "framework". The amino acid around the active site attaches to the substrate molecule and holds it in position while the reaction takes place. This makes the enzyme specific for one reaction only, as other molecules would not fit into the active site.Hence, D is the correct option.
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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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