Class 11 Biology · Chapter 5 · Test 1
Enzymes Part 1
45 MCQs This set covers what enzymes are, where they work and the active site of an enzyme. It also covers cofactors and coenzymes, the mechanism of enzyme action, and the lock-and-key and induced fit models.
45 questions · 30 min · 45 marks
Want to try first? Take the free Biology test: Biodiversity Part 1
Sample questions
The first 5 of 45. Try each one, then tap to see the answer.
Question 1
Enzymes are also known as
- ABiocatalysts
- BBiopolymers
- CBiomolecules
- DBioindicators
Show answerHide answer
Answer: A
Enzymes are specific proteins that act as biological catalysts.
Question 2
Chemically enzymes are
- ALipids
- BCarbohydrates
- CProteins
- DNucleic acids
Show answerHide answer
Answer: C
Enzymes are specific proteins that speed up chemical reactions.
Question 3
Enzymes speed up reactions by
- ARaising the activation energy
- BLowering the activation energy
- CAdding heat
- DBecoming part of the product
Show answerHide answer
Answer: B
They lower the activation energy required for the reaction.
Question 4
The rate of an enzyme-catalysed reaction may be greater than the uncatalysed rate by about
- A2 to 5 times
- B10 to 100 times
- C10^3 to 10^8 times
- D10^20 times
Show answerHide answer
Answer: C
Enzyme-catalysed reactions can be 10^3 to 10^8 times faster.
Question 5
After a reaction an enzyme is
- AUsed up
- BUnaltered
- CConverted to product
- DConverted to substrate
Show answerHide answer
Answer: B
Enzymes are not changed in the process and can be used again.
More tests in Enzymes
Practise with a free account
Save your scores, see which chapters need work, and keep a notebook of every question you got wrong.