Multiple choice

Which of the following is the best evidence for the Lock and Key theory of enzyme action?

  1. All isolated enzymes have been identified as proteins.

  2. Compounds similar in structure to substrate a molecule may inhibit the reaction.

  3. Enzymes speed up and determine the direction of a reaction.

  4. Enzymes are found only in cytoplasm of a cell.

  5. Enzymes are found only in the vacuoles of a cell.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Lock and key Theory, the active site of an enzyme is static in nature. It has a specific geometric shape where in the substrate molecule fits. It is just like a key and its particular lock in which levers of key act like active site of the enzyme to open a particular lock (substrate).

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