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VCE Units 1–4 · Biology

VCE Biology — Cell Biology

Cell biology forms the foundation of VCE Biology Units 1 and 2. Understanding the structure and function of organelles, how molecules move across membranes, and how cells obtain and use energy is essential before tackling genetics and molecular biology. Precision of language — using terms like "selectively permeable" correctly — is where marks are made or lost.

Key Concepts & Formulas

  • Prokaryotic cells: no membrane-bound nucleus or organelles; have cell wall, cell membrane, ribosomes, DNA in nucleoid

  • Eukaryotic cells: membrane-bound nucleus; contain specialised organelles including mitochondria, ER, Golgi body

  • Cell membrane: phospholipid bilayer with embedded proteins; selectively permeable

  • Diffusion: passive movement of molecules from high to low concentration; no energy required

  • Osmosis: diffusion of water through a selectively permeable membrane from low solute to high solute concentration

  • Active transport: movement against a concentration gradient; requires energy (ATP) and carrier proteins

  • Endocytosis: engulfing particles into the cell via vesicles; exocytosis: releasing particles out of the cell

  • Cellular respiration: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP; occurs in the cytoplasm (glycolysis) and mitochondria

  • Photosynthesis: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂; light reactions in thylakoids, Calvin cycle in stroma

  • ATP is the universal energy currency — produced by cellular respiration, used in active transport, movement and biosynthesis

Practice Questions

5 questions

Attempt each question before reading the hint. These are styled to match VCE exam format.

Q1.Describe TWO structural differences between a prokaryotic cell and a eukaryotic cell.

2 marks

Q2.Explain why red blood cells placed in a solution with a lower solute concentration than blood plasma would swell and potentially burst.

3 marks

Q3.Compare diffusion and active transport in terms of direction of movement, energy requirement and membrane proteins.

4 marks

Q4.Identify the location in the cell where each stage of cellular respiration occurs: glycolysis, Krebs cycle, electron transport chain.

3 marks

Q5.Explain the role of chlorophyll in photosynthesis and identify in which part of the chloroplast the light reactions occur.

3 marks

Common Mistakes to Avoid

These are the errors that VCE students most frequently make in Cell Biology — and that examiners are specifically watching for.

  • Stating that cell walls make cells "impermeable" — cell walls are porous; it is the membrane that is selectively permeable

  • Confusing osmosis direction — water moves toward the region of HIGHER solute concentration (lower water potential)

  • Saying ATP is "made in the mitochondria" — glycolysis produces ATP in the cytoplasm; mitochondria produce most ATP via oxidative phosphorylation

  • Confusing photosynthesis and cellular respiration equations — they are not exact reverses; the conditions and locations differ

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