Key term
AQA GCSE Combined Science Biology 8464
Bioenergetics
Cell Biology
Topic overviewEukaryotes and prokaryotesAnimal and plant cellsCell specialisation and differentiationMicroscopyChromosomes, mitosis and the cell cycleStem cells in embryos, adults and meristemsTherapeutic cloning, its risks, and cloning plantsDiffusion and the factors affecting its rateSurface area to volume ratio and exchange surfacesOsmosisActive transport
Ecology
Topic overviewLevels of organisation in an ecosystem, and what organisms needCompetition, interdependence and stable communitiesAbiotic factorsBiotic factorsAdaptationsProducers, food chains and sampling with quadrats and transectsPredators, prey and measuring population sizeHow materials are cycledWaste management and biodiversityLand use, deforestation and global warmingMaintaining biodiversity
Homeostasis and Response
Infection and Response
Inheritance, Variation and Evolution
Topic overviewSexual and asexual reproductionMeiosisDNA and the genomeGenetic terms, dominant and recessive allelesPunnett squares, probability and genetic crossesInherited disorders and sex determinationVariationEvolutionSelective breedingWhat genetic engineering is, and what it is used forGM crops, their risks, and the steps of the processEvidence for evolution, and extinctionFossilsResistant bacteriaClassification of living organisms
Organisation
Topic overviewLevels of organisation, and how enzymes workAmylase, proteases and lipasesBile, food tests and the effect of pH on amylaseThe heart, the lungs and double circulationThe pacemaker, the blood vessels and the bloodCoronary heart disease: a non-communicable diseaseHealth issuesRisk factors and causal mechanisms in diseaseSampling, correlation and interpreting risk dataCancerPlant tissues, and transpiration and its rateRoot hair cells, xylem, phloem and stomata
Homeostasis and Response
The use of hormones to treat infertility
- 3 things to know
- Biology Paper 2
Overview
FSH and LH in fertility drugs, why blocked oviducts defeat them, the stages of IVF from egg collection to embryo transfer, and its stresses, risks and objections.
What you need to know
Answer each one before you reveal it.
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Key term
How does a fertility drug help a woman to become pregnant?
Key term
Why would a fertility drug not help a woman whose oviducts are blocked?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Which two hormones are given in a fertility drug?
Model answer
FSH and LH.
- 2
How does a fertility drug help a woman to become pregnant?
Model answer
The FSH and LH stimulate eggs to mature and be released, so she may then become pregnant in the normal way.
- 3
Why would a fertility drug not help a woman whose oviducts are blocked?
Model answer
The egg still could not meet the sperm, so maturing more eggs would not lead to fertilisation.
- 4
Which treatment uses hormones when fertilisation inside the body is not possible?
Model answer
In vitro fertilisation, in which the egg is fertilised in the laboratory instead.
- 5
What do the letters IVF stand for?
Model answer
In vitro fertilisation.
- 6
Why is a woman given FSH and LH at the start of IVF treatment?
Model answer
To stimulate several eggs to mature so that more than one can be collected.
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