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Cell level systems

OCR GCSE Combined ScienceTopic 1 of 1819 lessons

Revision notes for Cell level systems in OCR Combined Science A (J250). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. Light microscopes and stainingA light microscope uses light and lenses to make a small object look bigger.
  2. Sub-cellular structures and their functionsPlant and animal cells are eukaryotic cells.
  3. Electron microscopyResolution is the ability to see two points that are close together as separate points.
  4. DNA as a polymerDNA (deoxyribonucleic acid) is the genetic material found in the nucleus of a cell.
  5. The double helix structure of DNAA DNA molecule is made of two strands.
  6. Investigating enzyme-controlled reactionsA common way to investigate an enzyme is to use amylase, which breaks down starch.
  7. How enzymes workMetabolism is the sum of all the chemical reactions in a living organism.
  8. Cellular respiration supplies ATPCellular respiration is a chemical process that releases energy from glucose.
  9. Respiration is exothermicAn exothermic reaction is one in which energy is transferred to the surroundings, usually as heat.
  10. Aerobic and anaerobic respirationAerobic respiration needs oxygen.
  11. Sugars and carbohydratesCarbohydrates are made from sugars.
  12. Amino acids and proteinsProteins are polymers.
  13. Fatty acids, glycerol and lipidsLipids are fats and oils.
  14. Photosynthetic organisms as producersGreen plants and algae, along with some bacteria, are photosynthetic organisms.
  15. The process of photosynthesisIn photosynthesis, the reactants are carbon dioxide and water.
  16. Photosynthesis as an endothermic reactionAn endothermic reaction takes in energy from the surroundings.
  17. Investigating photosynthesisSeveral experiments show what photosynthesis needs and what it makes.
  18. Factors affecting the rate of photosynthesisThree factors affect the rate of photosynthesis: light intensity, carbon dioxide concentration and temperature.
  19. Limiting factors and graphsThe rate of photosynthesis is controlled by whichever factor is in shortest supply.

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