Key term
Edexcel GCSE Combined Science Biology 1SC0
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 calculationsDiffusion, osmosis and active transportOsmosis in potatoes and percentage change in mass
Cells and Control
Genetics
Topic overviewMeiosis and the formation of gametesDNA structure, genes and the genomeExtracting DNA from fruitAlleles, 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
Health, Disease and the Development of Medicines
Topic overviewHealth, disease and susceptibilityPathogens and common infectionsHow pathogens spread, and the virus life cycleSexually transmitted infectionsPhysical barriers and chemical defencesThe immune system, immunisation and herd immunityAntibiotics and developing new medicinesLifestyle factors and non-communicable diseaseTreatments for cardiovascular disease
Plant Structures and Their Functions
Animal Coordination, Control and Homeostasis
Exchange and Transport in Animals
Topic overviewWhy multicellular organisms need exchange surfacesAlveoli and gas exchangeThe 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
Cells and Control
Why mitosis matters: growth, repair and cancer
- 3 things to know
- Paper 1
Overview
How mitosis brings about growth, repair and the replacement of gut lining cells, asexual reproduction such as strawberry runners, and cancer as uncontrolled cell division caused by changes in genes, forming tumours that damage healthy tissue.
What you need to know
Answer each one before you reveal it.
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Key term
What is asexual reproduction?
Key term
Give an example of a plant that reproduces asexually.
Questions from this subtopic
Each one with the model answer underneath.
- 1
How does mitosis allow a young organism to grow?
Model answer
It increases the number of cells in the body, so tissues and organs become larger.
- 2
How does mitosis help an injury to heal?
Model answer
Cells around the wound divide to produce new identical cells that replace the damaged ones.
- 3
Why do cells in the lining of the gut divide very frequently?
Model answer
These cells are constantly worn away and must be replaced by mitosis.
- 4
What is asexual reproduction?
Model answer
The production of offspring from a single parent, without gametes joining together.
- 5
Why are offspring produced by asexual reproduction genetically identical to their parent?
Model answer
They are made by mitosis, which produces cells with exactly the same chromosomes as the parent cell.
- 6
Give an example of a plant that reproduces asexually.
Model answer
A strawberry plant, which grows new plants at the ends of runners.
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