📚 GCSE AQA Biology: Last-Minute Revision Notes | GCSE AQA 生物：考前冲刺笔记
This revision guide covers the most essential topics for the AQA GCSE Biology exam. Each section provides a concise English explanation followed by the equivalent Chinese summary, helping you recall key facts and concepts quickly before the test.
这份冲刺笔记涵盖了 AQA GCSE 生物考试最核心的主题。每个部分先给出简明的英文解释，然后附上对应的中文总结，帮助你在考前快速回顾关键知识点。
1. Cell Structure and Function | 细胞结构与功能
Both plant and animal cells contain a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. Plant cells additionally have a rigid cell wall, a large permanent vacuole and chloroplasts for photosynthesis. Bacterial cells are prokaryotic – they lack a true nucleus and have a single loop of DNA free in the cytoplasm.
植物和动物细胞都含有细胞核、细胞质、细胞膜、线粒体和核糖体。植物细胞还有坚硬的细胞壁、一个大液泡以及用于光合作用的叶绿体。细菌细胞是原核细胞——没有真正的细胞核，只有一段游离在细胞质中的环形 DNA。
Key tip: Remember that animal cells never have chloroplasts or a cell wall, and that ribosomes are the site of protein synthesis.
关键提示：记住动物细胞绝不会有叶绿体或细胞壁，核糖体是蛋白质合成的场所。
- Eukaryotic cells have a membrane-bound nucleus; prokaryotic cells do not.
- 真核细胞有膜包被的细胞核；原核细胞没有。
- Mitochondria are where aerobic respiration occurs.
- 线粒体是有氧呼吸发生的场所。
- Ribosomes can be found in both eukaryotic and prokaryotic cells.
- 核糖体在真核和原核细胞中都能找到。
2. Cell Division: Mitosis and Meiosis | 细胞分裂：有丝分裂与减数分裂
Mitosis produces two genetically identical daughter cells for growth and repair. The cell cycle includes DNA replication, chromosome alignment, separation of chromatids and cytokinesis. Meiosis produces four genetically different haploid gametes, halving the chromosome number to ensure variation when fertilization occurs.
有丝分裂产生两个遗传上完全相同的子细胞，用于生长和修复。细胞周期包括 DNA 复制、染色体排列、姐妹染色单体分离和胞质分裂。减数分裂产生四个遗传上不同的单倍体配子，染色体数目减半，以保证受精时发生变异。
- Mitosis is used for asexual reproduction in some organisms.
- 有丝分裂在某些生物中用于无性繁殖。
- Meiosis introduces genetic variation through independent assortment and crossing over.
- 减数分裂通过独立分配和交叉互换引入遗传变异。
3. Transport Across Membranes | 跨膜运输
Diffusion is the net movement of particles from a region of high concentration to low concentration, down a concentration gradient. Osmosis is the diffusion of water through a partially permeable membrane. Active transport moves substances against the concentration gradient using energy from respiration.
扩散是粒子从高浓度区域向低浓度区域的净移动，顺浓度梯度进行。渗透是水通过半透膜的扩散。主动运输则利用呼吸作用提供的能量，逆浓度梯度运输物质。
- In a dilute solution, an animal cell may burst (lyse); in a concentrated solution it shrinks (crenation).
- 在稀溶液中，动物细胞可能破裂（溶血）；在浓溶液中则皱缩。
- Plant cells become turgid in dilute solutions and plasmolysed in concentrated ones.
- 植物细胞在稀溶液中变得硬挺，在浓溶液中发生质壁分离。
- Root hair cells absorb mineral ions by active transport.
- 根毛细胞通过主动运输吸收矿物质离子。
4. Enzymes and Digestion | 酶与消化
Enzymes are biological catalysts that speed up chemical reactions without being used up. Each enzyme has an active site with a specific shape, and the lock-and-key model explains substrate binding. High temperatures or extreme pH can denature the enzyme, changing the shape of the active site permanently.
酶是生物催化剂，能够加速化学反应而本身不被消耗。每种酶都有一个特定形状的活性位点，锁钥模型解释了底物的结合方式。高温或极端 pH 会使酶变性，永久改变活性位点的形状。
Digestive enzymes break down large insoluble molecules into smaller soluble ones so they can be absorbed into the blood. Amylase breaks down starch into maltose, protease breaks proteins into amino acids, and lipase breaks fats into fatty acids and glycerol. Bile is not an enzyme but emulsifies fats to give lipase a larger surface area.
消化酶将大个不溶性分子分解为小的可溶性分子，以便被吸收到血液中。淀粉酶将淀粉分解为麦芽糖，蛋白酶将蛋白质分解为氨基酸，脂肪酶将脂肪分解为脂肪酸和甘油。胆汁不是酶，但它能乳化脂肪，为脂肪酶提供更大的作用表面积。
5. The Circulatory System and Respiration | 循环系统与呼吸作用
The heart is a double pump: the right side pumps deoxygenated blood to the lungs, the left side pumps oxygenated blood to the rest of the body. Arteries carry blood away from the heart under high pressure; veins return blood and contain valves to prevent backflow; capillaries are thin-walled for efficient exchange.
心脏是一个双泵：右侧将缺氧血泵送到肺部，左侧将富氧血泵送到全身。动脉在高压下将血液带离心脏；静脉将血液送回并含有瓣膜防止倒流；毛细血管壁极薄，有利于高效物质交换。
Aerobic respiration occurs in mitochondria and releases energy from glucose using oxygen: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. Anaerobic respiration in muscle cells produces lactic acid and far less energy. In yeast, anaerobic respiration produces ethanol and carbon dioxide (fermentation).
有氧呼吸在线粒体中进行，利用氧气从葡萄糖中释放能量：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O。肌肉细胞中的无氧呼吸产生乳酸，释放的能量要少得多。在酵母中，无氧呼吸产生乙醇和二氧化碳（发酵）。
6. Plant Physiology: Photosynthesis and Transpiration | 植物生理：光合作用与蒸腾作用
Photosynthesis takes place in chloroplasts and uses light energy to convert carbon dioxide and water into glucose and oxygen. The balanced equation is: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. The rate is affected by light intensity, carbon dioxide concentration and temperature.
光合作用在叶绿体中进行，利用光能将二氧化碳和水转化为葡萄糖和氧气。平衡方程式为：6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂。光合速率受光照强度、二氧化碳浓度和温度的影响。
Transpiration is the loss of water vapour from the leaves through stomata. It creates a pull that draws water and dissolved minerals up the xylem from the roots. Factors increasing transpiration include higher temperature, lower humidity, increased air movement and light.
蒸腾作用是水蒸气通过气孔从叶片散失的过程。它产生向上的拉力，将水和溶解的矿物质从根部通过木质部向上输送。温度升高、湿度降低、空气流动加快和光照增强都会使蒸腾作用加剧。
7. Nervous and Hormonal Control | 神经与激素调控
The nervous system uses electrical impulses along neurones to bring about fast, short-lived responses. A reflex arc includes sensory, relay and motor neurones, bypassing conscious thought to protect the body. Synapses ensure impulses travel in one direction.
神经系统通过神经元传导电冲动，产生快速但短暂的响应。反射弧包括感觉神经元、中间神经元和运动神经元，绕过了意识思考以保护身体。突触确保冲动的单向传递。
Hormones are chemical messengers released into the blood by endocrine glands. They act more slowly but have longer-lasting effects. For example, insulin lowers blood glucose by causing cells to absorb glucose and the liver to store glycogen. Adrenaline prepares the body for ‘fight or flight’.
激素是由内分泌腺释放到血液中的化学信使。它们作用较慢，但效果更持久。例如，胰岛素通过促进细胞吸收葡萄糖和肝脏储存糖原而降低血糖。肾上腺素为身体做好“战斗或逃跑”的准备。
8. Reproduction and Inheritance | 生殖与遗传
DNA is a double helix polymer made of nucleotides. A gene is a section of DNA that codes for a specific protein. The genome is the entire genetic material of an organism. In sexual reproduction, gametes combine to produce unique offspring, while asexual reproduction creates clones.
DNA 是由核苷酸组成的双螺旋聚合物。基因是编码特定蛋白质的一段 DNA。基因组是一个生物体的全部遗传物质。有性繁殖中，配子结合产生独特的后代；无性繁殖则产生完全相同的克隆个体。
Mendelian genetics uses Punnett squares to predict offspring ratios. Alleles can be dominant or recessive, and homozygous (AA, aa) or heterozygous (Aa). Cystic fibrosis is a recessive disorder; polydactyly is dominant. Sex is determined by X and Y chromosomes – XX is female, XY is male.
孟德尔遗传学利用庞纳特方格预测后代表现比例。等位基因可以是显性或隐性，纯合（AA, aa）或杂合（Aa）。囊性纤维化是一种隐性遗传病；多指症则是显性。性别由 X 和 Y 染色体决定——XX 为女性，XY 为男性。
9. Evolution, Variation and Selective Breeding | 进化、变异与选择性育种
Variation arises from genetic differences, environmental influences or a combination of both. Natural selection acts on variation: individuals with advantageous traits are more likely to survive and reproduce, passing those alleles to the next generation. This can lead to evolution over time.
变异源于遗传差异、环境影响或两者共同作用。自然选择作用于变异：具有有利性状的个体更有可能生存和繁殖，并将这些等位基因传给下一代。这随着时间推移可导致进化。
Selective breeding (artificial selection) involves choosing parents with desirable characteristics and breeding them together. It has produced high-yield crops, pedigree dogs and fast racehorses, but can lead to inbreeding and reduced genetic diversity. Genetic engineering transfers genes between species, e.g. insulin production in bacteria.
选择性育种（人工选择）是选择具有理想特征的亲本并进行繁殖。它已培育出高产作物、纯种犬和快速的赛马，但可能导致近亲繁殖和遗传多样性的降低。基因工程可将基因在物种间转移，例如用细菌生产胰岛素。
10. Ecology and Ecosystems | 生态学与生态系统
An ecosystem includes all the organisms (community) and their physical environment. Producers (plants) capture energy via photosynthesis; consumers obtain energy by eating other organisms; decomposers break down dead matter and recycle nutrients. Food chains show energy flow, with each trophic level losing about 90% of energy as heat.
生态系统包含所有生物（群落）及其物理环境。生产者（植物）通过光合作用捕获能量；消费者通过摄食其他生物获得能量；分解者分解死物并循环利用营养。食物链展示能量流动，每一营养级大约 90% 的能量以热的形式散失。
The carbon cycle moves carbon through photosynthesis, respiration, combustion and decomposition. The water cycle involves evaporation, transpiration, condensation and precipitation. Deforestation, burning fossil fuels and increasing livestock farming all contribute to global warming by raising atmospheric CO₂ levels.
碳循环通过光合作用、呼吸作用、燃烧和分解使碳元素得以循环。水循环包括蒸发、蒸腾、凝结和降水。森林砍伐、燃烧化石燃料和增加畜牧业都通过提高大气 CO₂ 浓度导致全球变暖。
11. Microbiology and Health | 微生物学与健康
Pathogens include bacteria, viruses, fungi and protists. They spread through air, direct contact, water or vectors. The immune system defends the body by producing antibodies specific to antigens on pathogens. Vaccination exposes the body to a harmless form of the pathogen, triggering memory cell formation for swift future responses.
病原体包括细菌、病毒、真菌和原生生物。它们通过空气、直接接触、水或媒介传播。免疫系统通过产生针对病原体抗原的特异性抗体来进行防御。疫苗接种让身体接触无害形式的病原体，触发记忆细胞的形成，以便未来迅速响应。
Antibiotics kill bacteria but not viruses, as viruses live inside host cells. The emergence of antibiotic-resistant bacteria is accelerated by overuse of antibiotics. Aseptic techniques in culturing microorganisms prevent contamination, and calculating the area of inhibition zones helps determine antibiotic effectiveness.
抗生素能杀死细菌，但对病毒无效，因为病毒生活在宿主细胞内部。抗生素的过度使用加速了耐药细菌的产生。在培养微生物时，无菌技术可防止污染，通过计算抑菌圈面积可测定抗生素的效果。
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