Key term
OCR GCSE Combined Science Biology J250
Cell Level Systems
Topic overviewMicroscopy, and sub-cellular structuresDNA structure: polymer, double helix and nucleotidesEnzyme action, and investigating enzymesCellular respiration as an exothermic processAerobic and anaerobic respiration comparedSynthesis and breakdown of carbohydrates, proteins and lipidsPhotosynthesis: producers and the processPhotosynthesis as endothermic, and investigating itLimiting factors in photosynthesis
Community Level Systems
Genes, Inheritance and Selection
Topic overviewGenetic terms, and the genomeGenome, environment and mutationsHaploid, diploid and meiosisSingle gene inheritance and Punnett squaresSex determination and characteristics controlled by many genesVariation within a population, and classificationNatural selection and evolutionEvidence for evolution from fossils and antibiotic resistance
Global Challenges
Topic overviewField investigations, and human impact on ecosystemsMaintaining biodiversity, monitoring conservation and ecotourismSelective breeding and genetic engineeringHealth, disease, and types of diseaseInteractions between diseases, and how they spreadReducing the spread of disease, and named examplesWhite blood cells, antibodies and plateletsNon-specific defences and the immune systemVaccines, medicines and aseptic techniqueDeveloping new medicines, and non-communicable diseaseTreating cardiovascular disease, and lifestyle factorsCancer, and the use of stem cells in medicineGene technology in medicine, and the human genome
Organism Level Systems
Scaling Up
Topic overviewDiffusion, osmosis and active transportMitosis, the cell cycle and cell differentiationStem cells in animals and meristems in plantsSurface area to volume ratio and exchange surfacesThe circulatory system, the heart and blood vesselsRed blood cells and plasmaRoot hair cells, transpiration and translocationXylem and phloemFactors affecting water uptake, and the potometer
Cell Level Systems
Aerobic and anaerobic respiration compared
- 3 things to know
- Paper 1 (Biology)
Overview
The word equations for aerobic and anaerobic respiration, their difference in oxygen and ATP yield, the products in yeast and muscle, lactic acid and fatigue, and yeast in bread and brewing.
What you need to know
Answer each one before you reveal it.
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Key term
Give the word equation for anaerobic respiration in an animal cell.
Key term
Give the word equation for anaerobic respiration in a plant or fungal cell.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Give the word equation for aerobic respiration.
Model answer
Glucose + oxygen → carbon dioxide + water.
- 2
Give the word equation for anaerobic respiration in an animal cell.
Model answer
Glucose → lactic acid.
- 3
Give the word equation for anaerobic respiration in a plant or fungal cell.
Model answer
Glucose → ethanol + carbon dioxide.
- 4
What is the key difference in conditions between aerobic and anaerobic respiration?
Model answer
Aerobic respiration requires oxygen, while anaerobic respiration takes place without it.
- 5
Which substrate is broken down in both aerobic and anaerobic respiration?
Model answer
Glucose.
- 6
How do the yields of ATP from aerobic and anaerobic respiration compare?
Model answer
Aerobic respiration supplies far more ATP per glucose molecule than anaerobic respiration.
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