Key term
Edexcel GCSE Biology 1BI0
Key Concepts in Biology
Topic overviewEukaryotic and prokaryotic cellsSpecialised cells and their adaptationsMicroscopes and magnification calculationsSize, scale and units in cell biologyEnzyme action and denaturationFactors affecting enzyme activityEnzymes in synthesis and digestion, and rate calculationsFood tests and the energy in foodDiffusion, osmosis and active transportOsmosis in potatoes and percentage change in mass
Cells and Control
Topic overviewMitosis and the cell cycleWhy mitosis matters: growth, repair and cancerGrowth, differentiation and percentile chartsStem cells and their use in medicineThe structure and function of the brainNeurones, receptors and the reflex arcThe structure and function of the eyeEye defects and how they are corrected
Genetics
Topic overviewAsexual and sexual reproductionMeiosis and the formation of gametesDNA structure, genes and the genomeExtracting DNA from fruitMendel's work and the inheritance of blood groupsAlleles, genotype and phenotypeMonohybrid crosses and sex determinationProbability and ratios from genetic crossesCauses of variation: genes and environmentThe Human Genome ProjectGenetic variation and the effects of mutation
Natural Selection and Genetic Modification
Topic overviewDarwin, Wallace and the theory of evolutionNatural selection and antibiotic resistanceFossil evidence for human evolutionStone tool evidence for human evolutionThe pentadactyl limb and the three domainsSelective breedingTissue cultureGenetic engineering and modern agricultureBenefits and risks of GM organisms
Health, Disease and the Development of Medicines
Topic overviewHealth, disease and susceptibilityPathogens and common infectionsHow pathogens spread, and the virus life cycleSexually transmitted infectionsHow plants defend themselvesPhysical barriers and chemical defencesThe immune system, immunisation and herd immunityAntibiotics and developing new medicinesAseptic technique in culturing microorganismsTesting antiseptics and antibiotics on bacterial culturesLifestyle factors and non-communicable diseaseTreatments for cardiovascular disease
Plant Structures and Their Functions
Topic overviewPhotosynthesis as an endothermic reactionLimiting factors in photosynthesisLight intensity and the rate of photosynthesisRoot hair cells, xylem and phloemTranspiration and translocationLeaf structure for photosynthesis and gas exchangeFactors affecting the rate of transpirationPlant adaptations to extreme environmentsPlant hormones, phototropism and gravitropism
Animal Coordination, Control and Homeostasis
Topic overviewHormones, endocrine glands and homeostasisThe menstrual cycle and its hormonesHormonal and barrier contraceptionHomeostasis and thermoregulationControlling blood glucose, and type 1 diabetesType 2 diabetes and body massThe urinary system and the production of ureaThe nephron, filtration and selective reabsorptionTreating kidney failure: dialysis and transplants
Exchange and Transport in Animals
Topic overviewWhy multicellular organisms need exchange surfacesAlveoli and gas exchangeRate of diffusion and Fick's lawThe blood and its componentsArteries, veins and capillariesThe heart and the circulatory systemCellular respiration as an exothermic reactionAerobic and anaerobic respiration comparedInvestigating the rate of respirationCardiac output, stroke volume and heart rate
Ecosystems and Material Cycles
Topic overviewLevels of organisation and interdependenceAbiotic and biotic factors in a communityParasitism and mutualismSampling with quadrats and transectsEstimating population size from field dataEnergy transfer between trophic levelsHuman impact on ecosystems and biodiversityFood securityThe carbon cycleThe water and nitrogen cyclesFactors affecting the rate of decompositionCalculating the rate of decay
Natural Selection and Genetic Modification
Genetic engineering and modern agriculture
- 3 things to know
- Paper 1
Overview
Genetic engineering and why a human gene works in a bacterium, insulin-making bacteria and golden rice, transgenic organisms, its advantages over selective breeding, engineered human insulin, the risks and ethical objections, a risk shared with selective breeding, and labelling and the long-term effects of GM organisms.
What you need to know
Answer each one before you reveal it.
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Key term
Give an example of a genetically engineered bacterium and state what it produces.
Key term
Give one example of a genetically engineered crop plant and the characteristic that was added.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is genetic engineering?
Model answer
It is changing an organism's genome, usually by inserting a gene from a different organism, so that the organism develops a desired characteristic.
- 2
Explain why a gene taken from a human can still work when it is put into a bacterium.
Model answer
All organisms use the same genetic code, so the same sequence of bases is read to build the same protein whatever cell it is in.
- 3
Give an example of a genetically engineered bacterium and state what it produces.
Model answer
Bacteria given the human insulin gene produce insulin, which is used to treat people with diabetes.
- 4
Give one example of a genetically engineered crop plant and the characteristic that was added.
Model answer
Golden rice has been given genes so that its grains make beta-carotene, which the body converts into vitamin A.
- 5
Golden rice contains a gene taken from a daffodil. What term describes an organism like this?
Model answer
It is a genetically modified, or transgenic, organism.
- 6
Explain one advantage genetic engineering has over selective breeding.
Model answer
A single chosen gene can be added in one generation, and it can come from a completely different species rather than only from within the same one.
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