Topic Enzymes
Asked 5 times across 2 UPSC exams over 10 years (2016–2026), peaking in 2025.
Key insights
- Most tested in CDS — 4 of 5 PYQs
- Most asked in 2025
- Recurs across 4 years (2016–2026)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2016 → CAPF 2025
How the concept evolved
Rising — more than half its appearances (5 of 5) are since 2016.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2026
Nearly all infants benefit from milk, but most adults cannot properly digest milk. If an elderly person can still digest milk, his body is producing enough of which enzyme ?
- A Cellulase
- B Amylase
- C Pectase
- D Lactase ✓
✓ Correct answer: (D)
Science & Technology › Biology & Health
CAPF2025
Which one of the following statements regarding allosteric enzymes is correct?
- A Like other enzymes, allosteric enzymes also obey Michaelis-Menten kinetics.
- B The velocity versus substrate concentration graph is a hyperbolic graph, like any other enzyme.
- C They are always one-subunit enzymes.
- D Each subunit of allosteric enzyme also contains a regulatory site in addition to the active site.
Answer key not yet available (pending official release)
Science & Technology › Biology & Health
CDS2025
The enzymes which catalyze the same reaction but have different amino acid compositions are commonly referred as :
- A Isoenzymes ✓
- B Isotopes
- C Isomers
- D Coenzymes
✓ Correct answer: (A)
Science & Technology › Biology & Health
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