NEETChemistryBiomolecules
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The catalytic action of lyases leaves double bonds in the products. Reason (R): Lyases are enzymes that catalyse the removal of groups from substrates by hydrolysis. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
- CAssertion (A) is true but Reason (R) is false.
- DAssertion (A) is false but Reason (R) is true.
Correct answer
C. Assertion (A) is true but Reason (R) is false.
Step-by-step solution
According to the IUBMB system of classification, lyases are enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis, leaving double bonds. Therefore, Assertion (A) is true because the action of lyases does leave double bonds in the products. However, Reason (R) is false because lyases operate by mechanisms 'other than hydrolysis'. Enzymes that catalyse the removal of groups by hydrolysis are classified as hydrolases. Answer: Assertion (A) is true but Reason (R) is false.