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
Health, Disease and the Development of Medicines
Sexually transmitted infections
- 3 things to know
- Paper 1
Overview
Sexually transmitted infections, Chlamydia as a bacterial infection often passed on unnoticed and its effect on fertility, how HIV is passed on in body fluids, how condoms, screening and clean needles reduce spread, and why antibiotics cure Chlamydia but not HIV.
What you need to know
Answer each one before you reveal it.
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Key term
Explain why Chlamydia is often passed on without the infected person realising.
Key term
Describe two ways the spread of Chlamydia can be reduced.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a sexually transmitted infection?
Model answer
An infection passed from one person to another during sexual contact.
- 2
Which type of pathogen causes Chlamydia?
Model answer
A bacterium.
- 3
Explain why Chlamydia is often passed on without the infected person realising.
Model answer
Many people who have it show no symptoms, so they do not know they are infected and continue to pass it on.
- 4
Describe one long-term effect of untreated Chlamydia.
Model answer
It can damage the reproductive organs and cause infertility in both men and women.
- 5
Describe two ways the spread of Chlamydia can be reduced.
Model answer
Using a condom during sexual contact, and screening people so that those infected can be treated with antibiotics.
- 6
Apart from sexual contact, how can HIV be passed on?
Model answer
It is passed on in other body fluids, for example by sharing needles or from a mother to her baby in breast milk.
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