AQA A Level Biology – 25 Mark Essays Questions and Answers – 100% Solved
A cycle is a biological pathway or process in which the end product of one cycle becomes the
starting point for the next. Write an essay about cycles in biology - ✔✔✔-1) Nitrogen cycle
2) Enzyme action
3) Synthesis of ATP from ADP
4) Light-independent reaction
5) The Krebs cycle
6) The mechanism of breathing
7) The cardiac cycle
8) The cell cycle/mitosis
9) meiosis
10) Muscle contraction
Cells and organisms carry out exchanges with their external environment to maintain their
internal environment - ✔✔✔-1) Homeostasis (concept of)
2) Digestion and absorption
3) Cells
4) Lung function
5) Gas exchange
6) Passage of water through plant
7) Nutrient cycles
8) Response to stimuli
9) Neurones
10) Temperature control
11) tissue fluid and its formation
12) Control of blood glucose concentration
13) Negative feedback
14) Gene expression
, AQA A Level Biology – 25 Mark Essays Questions and Answers – 100% Solved
Describe how the structures of different polymers are related to their functions - ✔✔✔-1)
Biological molecules - carbs/proteins
2) release of energy from carbs
3) control of blood glucose
4) enzymes
5) DNA - structure
6) principles of immunology
7) transport of respiratory gases
DNA and the transfer of information - ✔✔✔-1. Genes/how information is carried on
2. DNA
3. Replication of DNA
4. Cell division - Mitosis and meiosis
5. Transcription and translation
6. Mutation
7. Genetic engineering
8. Gene therapy
9. Genetically modified organisms
10. Variation (in populations)
11. Evolution
12. Inheritance
How energy is transferred within and between organisms - ✔✔✔-1) Photosynthesis
2) Energy transfer through ecosystems
3) Food production
A cycle is a biological pathway or process in which the end product of one cycle becomes the
starting point for the next. Write an essay about cycles in biology - ✔✔✔-1) Nitrogen cycle
2) Enzyme action
3) Synthesis of ATP from ADP
4) Light-independent reaction
5) The Krebs cycle
6) The mechanism of breathing
7) The cardiac cycle
8) The cell cycle/mitosis
9) meiosis
10) Muscle contraction
Cells and organisms carry out exchanges with their external environment to maintain their
internal environment - ✔✔✔-1) Homeostasis (concept of)
2) Digestion and absorption
3) Cells
4) Lung function
5) Gas exchange
6) Passage of water through plant
7) Nutrient cycles
8) Response to stimuli
9) Neurones
10) Temperature control
11) tissue fluid and its formation
12) Control of blood glucose concentration
13) Negative feedback
14) Gene expression
, AQA A Level Biology – 25 Mark Essays Questions and Answers – 100% Solved
Describe how the structures of different polymers are related to their functions - ✔✔✔-1)
Biological molecules - carbs/proteins
2) release of energy from carbs
3) control of blood glucose
4) enzymes
5) DNA - structure
6) principles of immunology
7) transport of respiratory gases
DNA and the transfer of information - ✔✔✔-1. Genes/how information is carried on
2. DNA
3. Replication of DNA
4. Cell division - Mitosis and meiosis
5. Transcription and translation
6. Mutation
7. Genetic engineering
8. Gene therapy
9. Genetically modified organisms
10. Variation (in populations)
11. Evolution
12. Inheritance
How energy is transferred within and between organisms - ✔✔✔-1) Photosynthesis
2) Energy transfer through ecosystems
3) Food production
