Which description best defines an enzyme?
- A storage carbohydrate
- A substance used up in every reaction
- A hormone in every case
- A biological catalyst
Answer / جواب
A biological catalyst
Class 9 Biology Chapter 7 MCQs — Enzymes
Class 9 Biology · Chapter 7 · Retained syllabus for Annual 2027
Practise this chapter online, check each answer and review your result. The current bank contains 8 objective questions for this chapter and medium.
Sample practice questions
What can happen well above an enzyme's optimum temperature?
- It gains unlimited active sites
- It remains active at every temperature
- It becomes its own substrate
- Its shape changes and activity decreases
Answer / جواب
Its shape changes and activity decreases
A prosthetic group is a cofactor with what attachment?
- Tightly bound to its enzyme
- Always unattached
- Only loosely associated
- Always a separate substrate
Answer / جواب
Tightly bound to its enzyme
How does increasing temperature usually affect enzyme activity before the optimum?
- Every enzyme immediately denatures
- Activity always decreases
- Activity increases up to a point
- There is never a change
Answer / جواب
Activity increases up to a point
Printable practice
Use custom mode for a chapter paper. Board Annual mode uses the complete prescribed syllabus and published question distribution for supported subjects.