Enzymes and Ribozymes: Catalysts — NEET Biology
📚 Practice ConceptEnzymes are proteins which catalyse biochemical reactions in the cells. Ribozymes are nucleic acids with catalytic power. Proteinaceous enzymes exhibit substrate specificity, require optimum temperature and pH for maximal activity. They are denatured at high temperatures. Enzymes lower activation energy of reactions and enhance greatly the rate of the reactions. Nucleic acids carry hereditary information and are passed on from parental generation to progeny.
Assertion (A): Each enzyme shows optimal activity under specific environmental conditions. Reason (R): Enzymes are proteins which catalyse biochemical reactions in the cells.
View solution & NCERT explanation
Correct answer: B — If both assertion and reason are true but reason is not the correct explanation of the assertion.
Both statements are true from NCERT. The Assertion is true - NCERT states “Each enzyme shows its highest activity at a particular temperature and pH called the optimum temperature and optimum pH.” The Reason is also true - NCERT states “Enzymes are proteins which catalyse biochemical reactions in the cells.” However, the Reason doesn’t explain WHY enzymes have optimal conditions - it just defines what enzymes are.
What does NCERT say about Enzymes are proteins which?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.