Junior college / 9477 / 2027

H2 Biology

Find the explanation you need. See it, understand it, then try it yourself.

Choose a different syllabus

Find a topic or concept

Choose a chapter

20 chapters / 107 lessons

Start with a lesson, jump to practice, or scan a summary. Your place and answers stay on this browser.

Cells and microscopy

Identify the cell structures you can see, explain their jobs and measure them correctly.

5 lessons

Start learning Practise Summary

Biological molecules

Use molecular bonds and shape to explain storage, support, membranes and proteins.

6 lessons

Start learning Practise Summary

Membranes and transport

Choose the correct transport mechanism from the molecule, gradient and energy evidence.

4 lessons

Start learning Practise Summary

Enzymes and investigations

Connect active-site chemistry to rate curves, inhibition and practical measurements.

4 lessons

Start learning Practise Summary

Stem cells and differentiation

Separate developmental potential from self-renewal, then follow normal cell lineages.

2 lessons

Start learning Practise Summary

DNA replication and gene expression

Track sequence, direction and information from DNA copying to a finished polypeptide.

6 lessons

Start learning Practise Summary

Genomes and gene regulation

Explain how the same genome produces different cells, and locate control using experimental evidence.

5 lessons

Start learning Practise Summary

Viral and bacterial genetics

Follow genomes through viral cycles, bacterial division and horizontal gene transfer.

6 lessons

Start learning Practise Summary

DNA amplification and analysis

Choose PCR, a gel or a probe for the question, and interpret their controls honestly.

3 lessons

Start learning Practise Summary

Mutation, cell division and cancer

Connect sequence changes, chromosome behaviour and regulation to inheritance and cell function.

9 lessons

Start learning Practise Summary

Inheritance and genetic problems

Solve crosses from gametes, linkage and pathways, with clear probability assumptions.

7 lessons

Start learning Practise Summary

Photosynthesis and energy capture

Trace photons, electrons, protons and carbon through the chloroplast.

5 lessons

Start learning Practise Summary

Respiration and ATP production

Account for carbon and carriers, then explain how electron transfer supports ATP synthesis.

5 lessons

Start learning Practise Summary

Cell signalling and glucose control

Connect receptor binding to amplification, cellular responses and negative feedback.

4 lessons

Start learning Practise Summary

Evolution, species and phylogeny

Explain population change and use evidence to reconstruct branching relationships.

6 lessons

Start learning Practise Summary

Population genetics

Count allele copies, use Hardy-Weinberg with confidence, and explain why variation persists.

5 lessons

Start learning Practise Summary

Immune recognition and memory

Connect immune-cell roles, antibody structure and genetic diversification.

5 lessons

Start learning Practise Summary

Infection, vaccination and disease spread

Link pathogen biology to disease, selective treatments and transmission models.

5 lessons

Start learning Practise Summary

Climate, biodiversity and disease ecology

Connect carbon choices to ecosystem stress, food resilience and changing vector risks.

7 lessons

Start learning Practise Summary

Practical and data skills

Plan a fair investigation, make sense of measurements and choose the right calculation or statistical test.

8 lessons

Start learning Practise Summary