A-Level Biology: Cell Structure and Division

Cell biology at A-level is where the microscope meets the mathematics: organelle functions must be known cold, but the marks often ride on magnification calculations, fractionation logic and the ability to reason about what different microscopes can and cannot show. This quiz covers all of it.

The organelle questions test working knowledge rather than list recall: which organelles cooperate in protein production and export (rough endoplasmic reticulum with the Golgi apparatus, tested as a pathway), what lysosomes actually do, and the specific modifications the Golgi performs. Prokaryotic cells and viruses are covered by their defining differences — murein walls, plasmids, 70S ribosomes, and the acellular protein-capsid structure of viruses.

The quantitative and practical layer is fully represented: a magnification calculation with real unit conversion (a 50 mm image of a 20 micrometre cell), the optical-versus-electron microscope comparison in terms of resolution and specimen treatment, and cell fractionation, tested on the logic of differential centrifugation — why the nucleus pellets first and what that implies about the sequence.

Cell division questions cover the cell cycle phase by phase — DNA replication pinned to S phase, spindle behaviour at metaphase — and binary fission as the prokaryotic counterpart, completing the specification's cell-division picture.

Each explanation shows the reasoning, not just the answer, and the set is a natural companion to the Transport Across Membranes quiz: together they cover the cell-biology core that both written papers draw on repeatedly.

• Assign functions to eukaryotic organelles and trace the protein-export pathway
• Contrast prokaryotic cells and viruses with eukaryotic cells by defining features
• Perform magnification calculations with correct unit conversions
• Reason through cell fractionation and differential centrifugation order
• Pin key events to cell-cycle phases and describe mitosis and binary fission

Topic scope follows the cell structure and division content of the DfE A level biology subject content as delivered in current exam-board specifications: organelles, prokaryotes and viruses, microscopy and magnification, cell fractionation, the cell cycle and mitosis.