AQA A-level Biology Year 13 revision

Topic 5: Energy transfers in and between organisms

It builds on what you learned at AS in Biological molecules, and takes it further.

There are 7 parts: we start with photosynthesis, and finish with nutrient cycles.

1. 5.1PhotosynthesisFree 44 questions
2. 5.2Practical: chromatography of photosynthetic pigments (Rf values)15 questions
3. 5.3Practical: rate of photosynthesis and dehydrogenase activity in chloroplasts43 questions
4. 5.4Respiration31 questions
5. 5.5Practical: the rate of respiration in yeast (required practical 9)18 questions
6. 5.6Energy and ecosystems65 questions
7. 5.7Nutrient cycles30 questions

Topic 6: Organisms respond to changes in their internal and external environments

It builds on what you learned at AS in Organisms exchange substances with their environment, and takes it further.

There are 14 parts: we start with stimuli, receptors and plant responses, and finish with control of blood water potential.

1. 6.1Stimuli, receptors and plant responsesFree 34 questions
2. 6.2Photoreceptors: rod and cone cells and the retina79 questions
3. 6.3Reflex arcs and simple reflexes37 questions
4. 6.4Practical: effect of an environmental variable on animal movement (taxis and kinesis)37 questions
5. 6.5Control of heart rate63 questions
6. 6.6Neurones: sensory, relay and motor neurones, and the myelin sheath21 questions
7. 6.7Nervous coordination31 questions
8. 6.8Synapses: cholinergic synapses, neuromuscular junctions, summation and drugs22 questions
9. 6.9Skeletal muscle35 questions
10. 6.10Principles of homeostasis and negative feedbackFree 30 questions
11. 6.11Control of blood glucose69 questions
12. 6.12Practical: dilution series and colorimetric calibration curve for glucose concentration41 questions
13. 6.13The kidney: nephron structure, ultrafiltration and selective reabsorption26 questions
14. 6.14Control of blood water potential50 questions

Topic 7: Genetics, populations, evolution and ecosystems

It builds on what you learned at AS in Genetic information, variation and relationships between organisms, and takes it further.

There are 11 parts: we start with inheritance, and finish with statistical tests in ecology.

1. 7.1InheritanceFree 33 questions
2. 7.2Autosomal linkage and epistasis26 questions
3. 7.3Chi-squared test for genetic crosses22 questions
4. 7.4Populations and Hardy–Weinberg35 questions
5. 7.5Types of natural selection: stabilising, directional and disruptive31 questions
6. 7.6Genetic drift, founder effect and population bottlenecks28 questions
7. 7.7Evolution and speciation32 questions
8. 7.8Populations in ecosystems70 questions
9. 7.9Ecological sampling: random sampling, quadrats, transects and mark-release-recapture75 questions
10. 7.10Practical: effect of an environmental factor on the distribution of a species28 questions
11. 7.11Statistical tests in ecology: Spearman's rank, t-test and Simpson's index of diversity23 questions

Topic 8: The control of gene expression

It builds on what you learned at AS in Genetic information, variation and relationships between organisms, and takes it further.

There are 14 parts: we start with mutations, and finish with ethical, social and economic issues of genetic technologies and GM organisms.

1. 8.1MutationsFree 23 questions
2. 8.2Gene expression, stem cells and cancer78 questions
3. 8.3Transcription factors and control of transcriptionFree 31 questions
4. 8.4Epigenetics: DNA methylation and histone modification42 questions
5. 8.5RNA interference and post-transcriptional control of gene expression24 questions
6. 8.6Genome projects22 questions
7. 8.7Gene technologies42 questions
8. 8.8Recombinant DNA technology: restriction enzymes, vectors and transformation of organisms65 questions
9. 8.9The polymerase chain reaction (PCR)27 questions
10. 8.10DNA probes, genetic screening and personalised medicine35 questions
11. 8.11Gel electrophoresis and DNA profiling (genetic fingerprinting)24 questions
12. 8.12Gene therapy25 questions
13. 8.13DNA sequencing methods and bioinformaticsFree 38 questions
14. 8.14Ethical, social and economic issues of genetic technologies and GM organisms30 questions

Other exam boards