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
Organism Level Systems
Type 1 and type 2 diabetes
- 3 things to know
- Paper 1 (Biology)
Overview
What type 1 and type 2 diabetes are, when each usually appears, insulin injections and why insulin cannot be swallowed, diet and exercise for type 2, risk factors, symptoms, and glucose in the urine.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
What is type 2 diabetes?
Process
At what stage of life does each type of diabetes usually first appear?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is type 1 diabetes?
Model answer
A condition in which the pancreas does not produce enough insulin, so the blood glucose concentration can rise dangerously high.
- 2
What is type 2 diabetes?
Model answer
A condition in which the body cells stop responding properly to insulin, so blood glucose stays too high.
- 3
At what stage of life does each type of diabetes usually first appear?
Model answer
Type 1 usually begins in childhood or adolescence, while type 2 usually develops in adults.
- 4
How is type 1 diabetes treated?
Model answer
With injections of insulin, matched to the person's meals and exercise.
- 5
Why must insulin be injected rather than swallowed as a tablet?
Model answer
Insulin is a protein and would be digested in the stomach and small intestine before it could reach the blood.
- 6
How is type 2 diabetes usually treated first?
Model answer
With a carbohydrate-controlled diet, losing weight and taking regular exercise.
Other ways to work this
The same content, four other ways.
What is inside Levo
Six ways to work the same material.
Every question in Organism Level Systems, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
Or £46 a year, about £3.83 a month. Cancel anytime.