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Biology — Tier 3

Genetics, cell biology, physiology, ecology, and evolution for Classes XI–XII

Sample Practice Questions

Which enzyme synthesises DNA during replication?
- RNA polymerase
- DNA polymerase
- Helicase
- Ligase
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Answer: DNA polymerase
The lac operon model explains:
- Protein synthesis in eukaryotes
- Gene regulation in bacteria (inducible gene expression)
- DNA replication
- Viral infection mechanism
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Answer: Gene regulation in bacteria (inducible gene expression)
Which hormone primarily maintains pregnancy?
- Oestrogen
- Progesterone
- HCG
- Prolactin
Show answer

Answer: Progesterone
Which biomolecule is the primary component of cell membranes?
- Protein
- Carbohydrate
- Phospholipid bilayer
- DNA
Show answer

Answer: Phospholipid bilayer

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Practice Questions

Practise NGSE questions on Biology — Tier 3. Answers are revealed after each question.

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Frequently Asked Questions

What does Biology — Tier 3 cover in the NGSE exam?

Genetics, cell biology, physiology, ecology, and evolution for Classes XI–XII.

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