B1 content – Cell Biology (Paper 1) Cell Structure (Animal, plant, bacterial) Investigating Cells (Size, microscopes, calculating magnification, growing microbes) Cell Division (Chromosomes, mitosis and the cell cycle, stem cells) Transport In and Out of Cells (Diffusion, osmosis, active transport) Required practicals: Microscopy – Observe, draw and label a section of a plant and animal cell (page 10 in revision guide) Investigating the effect of different concentrations of sugar solution on plant tissue (osmosis) (page 15 in revision guide)

B1 Revision – Cell Biology (page 8-15 in revision guide) Which sub-cellular structure controls the activities of the cell? Write down three structures that are found in plant cells but not in animal cells: Write down two precautions that should be taken to stop a bacterial culture getting contaminated A student draws a cheek cell. The cell in the drawing is 50mm wide. In real life the cell is 0.025mm. What is the magnification of their drawing? Explain the differences between a eukaryotic and prokaryotic cell. How many chromosomes are in each human cell? Describe what mitosis is. What is required for substances to be absorbed against a concentration gradient? KEY WORDS: Nucleus Cytoplasm Cell membrane Mitochondria Plasmid Eukaryotic Prokaryotic Resolution Electron microscope Magnification Binary fission Culture Agar Chromosomes DNA Gene Mitosis Stem cell Embryonic Therapeutic