📚 Year 10 AQA Biology: Core Topics Summary | AQA 10年级生物：核心知识点梳理
This article provides a comprehensive summary of the core topics covered in Year 10 AQA GCSE Biology, including Cell Biology, Organisation, Infection and Response, and Bioenergetics. Each section pairs English explanations with Chinese translations, helping you grasp the key concepts, essential terminology, and required practical skills for success in your exams.
本文全面梳理了AQA 10年级GCSE生物课程的核心知识点，涵盖细胞生物学、机体组成、感染与响应以及生物能量学。每一部分均配有中英对照讲解，帮助你掌握关键概念、重要术语以及考试中必备的实验技能。
1. Cell Structure & Microscopy | 细胞结构与显微技术
All living organisms are made of cells. Eukaryotic cells (animals, plants, fungi) have a membrane‑bound nucleus, while prokaryotic cells (bacteria) do not; their genetic material is a single DNA loop in the cytoplasm.
所有生物体都由细胞构成。真核细胞（动物、植物、真菌）具有由膜包裹的细胞核，而原核细胞（细菌）则没有细胞核，其遗传物质是细胞质中的一条环状DNA。
Animal cells contain a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. Plant cells additionally possess a rigid cell wall, a large permanent vacuole and chloroplasts for photosynthesis.
动物细胞包含细胞核、细胞质、细胞膜、线粒体和核糖体。植物细胞还具备坚硬的细胞壁、一个大的中央液泡以及用于光合作用的叶绿体。
Bacteria are much smaller, with a cell wall, cell membrane, cytoplasm and plasmids — small rings of DNA that can carry extra genes such as antibiotic resistance.
细菌要小得多，具有细胞壁、细胞膜、细胞质和质粒——即一些可以携带额外基因（如抗生素抗性基因）的小环状DNA。
| Feature / 特征 | Animal Cell / 动物细胞 | Plant Cell / 植物细胞 | Bacterium / 细菌 |
|---|---|---|---|
| Nucleus / 细胞核 | Yes / 有 | Yes / 有 | No – DNA loop / 无，环状DNA |
| Cell wall / 细胞壁 | No / 无 | Made of cellulose / 由纤维素构成 | Made of peptidoglycan / 由肽聚糖构成 |
| Chloroplasts / 叶绿体 | No / 无 | Yes / 有 | No / 无 |
| Plasmids / 质粒 | No / 无 | No / 无 | Often present / 经常存在 |
Light microscopes allowed us to first observe cells. The magnification and resolution of an electron microscope are much higher, enabling us to see sub‑cellular structures like mitochondria and ribosomes in detail.
光学显微镜让我们首次观察到细胞。电子显微镜的放大倍数和分辨率要高得多，使我们能够清晰地看到线粒体、核糖体等亚细胞结构。
Magnification = Image Size ÷ Actual Size
放大倍数 = 图像大小 ÷ 实际大小
2. Cell Division (Mitosis & Stem Cells) | 细胞分裂（有丝分裂与干细胞）
The cell cycle consists of growth (G1, S, G2) and mitosis. Mitosis produces two genetically identical daughter cells, essential for growth, repair and asexual reproduction.
细胞周期包括生长期（G1期、S期、G2期）和有丝分裂期。有丝分裂产生两个遗传上完全相同的子细胞，对生物体的生长、修复和无性生殖至关重要。
During mitosis, chromosomes condense, line up at the cell equator and are pulled apart by spindle fibres to opposite poles before the cytoplasm divides.
在有丝分裂过程中，染色体浓缩、排列在细胞赤道板上，被纺锤丝牵拉至细胞两极，随后细胞质分裂。
Stem cells are undifferentiated cells that can divide and develop into specialised cells. Embryonic stem cells can become almost any cell type, while adult stem cells (e.g. in bone marrow) can only differentiate into certain cell types.
干细胞是尚未分化的细胞，能够分裂并发育成特化细胞。胚胎干细胞几乎可以分化为任何一种细胞类型，而成体干细胞（如骨髓中的干细胞）仅能分化成特定类型的细胞。
Stem cell therapies hold promise for treating conditions like diabetes and paralysis, but ethical concerns surround the use of embryonic stem cells.
干细胞疗法在治疗糖尿病、瘫痪等疾病方面前景广阔，但使用胚胎干细胞引发了伦理争议。
3. Transport in Cells | 细胞运输
Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration, down a concentration gradient, and requires no energy.
扩散是指粒子沿着浓度梯度从高浓度区域向低浓度区域净移动的过程，不需要消耗能量。
Osmosis is the diffusion of water molecules across a partially permeable membrane from a dilute solution to a more concentrated solution.
渗透是指水分子通过半透膜从稀溶液向浓溶液扩散的过程。
Active transport moves substances against the concentration gradient, from low to high concentration, using energy from respiration.
主动运输利用呼吸作用释放的能量，使物质逆浓度梯度从低浓度一侧运输到高浓度一侧。
| Process / 过程 | Concentration gradient / 浓度梯度 | Energy required / 需要能量 | Example / 实例 |
|---|---|---|---|
| Diffusion / 扩散 | Down / 顺 | No / 否 | Oxygen entering blood / 氧气进入血液 |
| Osmosis / 渗透 | Down (water only) / 顺（仅水） | No / 否 | Water uptake by roots / 根部吸水 |
| Active transport / 主动运输 | Against / 逆 | Yes / 是 | Mineral ion uptake / 矿物质离子吸收 |
In the human gut, digested food molecules are absorbed by diffusion and active transport; in plant roots, mineral ions are actively taken up from dilute soil solutions.
在人体肠道中，消化后的食物分子通过扩散和主动运输被吸收；在植物根部，矿质离子通过主动运输从稀薄的土壤溶液中吸收。
4. Organisation: Digestive System & Enzymes | 机体组成：消化系统与酶
Large food molecules must be broken down into smaller, soluble molecules that can be absorbed into the bloodstream. This happens through mechanical digestion and chemical digestion using enzymes.
大分子食物必须被分解为更小、可溶的分子，才能被吸收进入血液。这一过程通过物理性消化和酶的化学性消化共同完成。
Enzymes are biological catalysts that speed up chemical reactions. The 'lock and key' model explains how a substrate fits into the enzyme's active site. Each enzyme is specific to its substrate.
酶是能够加速化学反应的生物催化剂。“锁钥模型”解释了底物如何与酶的活性部位结合。每种酶对其底物具有高度特异性。
Digestive enzymes: amylase breaks down starch into maltose (produced in salivary glands and pancreas); proteases break proteins into amino acids; lipase breaks lipids into glycerol and fatty acids.
消化酶：淀粉酶将淀粉分解为麦芽糖（由唾液腺和胰腺产生）；蛋白酶将蛋白质分解为氨基酸；脂肪酶将脂质分解为甘油和脂肪酸。
Bile is produced in the liver and stored in the gall bladder; it emulsifies fats to create a larger surface area for lipase, and it neutralises stomach acid to provide alkaline conditions for intestinal enzymes.
胆汁在肝脏中生成并储存在胆囊中；它能乳化脂肪，增大脂肪酶的作用表面积，还能中和胃酸，为肠道酶提供碱性环境。
Enzyme activity is affected by temperature and pH. Above the optimum temperature the enzyme denatures, and the active site changes shape permanently.
酶的活性受温度和pH值影响。超过最适温度时，酶发生变性，活性部位永久性改变形状。
5. Organisation: Circulatory System & Blood | 机体组成：循环系统与血液
Mammals have a double circulatory system: one circuit carries blood from the heart to the lungs and back, and the other pumps oxygenated blood around the body.
哺乳动物具有双循环系统：一条循环路径将血液从心脏输送到肺部再返回，另一条路径将含氧血泵送至全身各处。
The heart has four chambers: two atria that receive blood, and two ventricles which pump blood out. The muscular left ventricle has a thicker wall to generate high pressure for systemic circulation.
心脏有四个腔室：两个心房负责接收血液，两个心室负责泵出血液。肌层更厚的左心室壁能产生较高的压力，以推动体循环。
Arteries carry blood away from the heart under high pressure (thick, elastic walls); veins return blood at lower pressure and contain valves to prevent backflow; capillaries are one‑cell thick to allow efficient diffusion.
动脉将血液在高压下运离心脏（管壁厚且富有弹性）；静脉将血液在较低压力下送回心脏，内含瓣膜以防止倒流；毛细血管仅由一层细胞构成，利于高效扩散。
Blood consists of red blood cells (carry oxygen using haemoglobin), white blood cells (defence against pathogens), platelets (clotting), and plasma (transports nutrients, hormones, and waste).
血液由红细胞（利用血红蛋白运输氧气）、白细胞（防御病原体）、血小板（参与凝血）和血浆（运输营养物质、激素和代谢废物）组成。
6. Organisation: Plant Transport Systems | 机体组成：植物运输系统
Xylem tissue transports water and dissolved mineral ions from the roots to the leaves. The continuous column of water is pulled upward by transpiration from the leaves.
木质部组织负责将水和溶解的矿质离子从根部运输到叶片。由叶片蒸腾作用产生的拉力驱动着连续水柱向上移动。
Phloem tissue transports dissolved sugars (mainly sucrose) produced during photosynthesis from the leaves to other parts of the plant; this movement is called translocation.
韧皮部组织则将光合作用产生的溶解性糖类（主要是蔗糖）从叶片运输到植物的其他部位，这一过程被称为转运。
Transpiration rate is increased by higher temperature, lower humidity, increased air movement and higher light intensity, because these factors speed up evaporation from stomata.
较高的温度、较低的湿度、增加的气流和较强的光照都能加快蒸腾速率，因为这些因素加速了水分从气孔的蒸发。
7. Infection & Response: Pathogens & Body Defences | 感染与响应：病原体与身体防御
Pathogens are microorganisms that cause infectious diseases. The main types are viruses, bacteria, fungi and protists. Viruses are much smaller, reproduce inside host cells and are not killed by antibiotics.
病原体是引起传染病的微生物，主要包括病毒、细菌、真菌和原生生物。病毒要小得多，只能在宿主细胞内繁殖，且不被抗生素杀灭。
Bacteria can produce toxins that damage cells and tissues. Diseases like salmonella and gonorrhoea are bacterial; measles and HIV are viral; rose black spot is a fungal disease; malaria is caused by a protist.
细菌可产生损伤细胞和组织的毒素。沙门氏菌和淋病是细菌性疾病；麻疹和HIV是病毒性疾病；玫瑰黑斑病是真菌病害；疟疾由原生生物引起。
The body's first line of defence includes the skin (a physical barrier), mucus in airways that traps pathogens, and stomach acid that destroys swallowed microbes.
人体的第一道防线包括皮肤（物理屏障）、呼吸道中能粘住病原体的黏液，以及能杀灭吞入微生物的胃酸。
White blood cells defend us by phagocytosis (engulfing and digesting pathogens), by producing antibodies that bind to specific antigens, and by releasing antitoxins to neutralise bacterial toxins.
白细胞通过吞噬作用（吞入并消化病原体）、产生与特定抗原结合的抗体，以及释放抗毒素来中和细菌毒素，从而保护我们。
8. Infection & Response: Vaccination, Antibiotics & Drug Development | 感染与响应：疫苗、抗生素与药物开发
Vaccination exposes the immune system to a dead or weakened pathogen, triggering antibody production and memory cells. On later exposure the response is rapid, preventing illness.
疫苗接种使免疫系统接触到灭活或减毒的病原体，刺激机体产生抗体和记忆细胞。当再次遇到该病原体时，免疫应答迅速，从而阻止疾病发生。
Antibiotics like penicillin kill infective bacteria inside the body, but they do not destroy viruses. Misuse has led to antibiotic‑resistant strains such as MRSA.
青霉素等抗生素能杀死体内的感染性细菌，但对病毒无效。抗生素的滥用已导致耐抗生素菌株的出现，例如MRSA。
New drugs are tested in preclinical trials on cells, tissues and live animals. Clinical trials use healthy volunteers and patients to check for safety, dosage and efficacy, often using double‑blind protocols.
新药在临床前试验中先在细胞、组织和活体动物上进行测试。临床试验则使用健康志愿者和患者来检验安全性、剂量和疗效，常采用双盲法。
9. Bioenergetics: Photosynthesis | 生物能量学：光合作用
Photosynthesis is the process by which plants and algae convert carbon dioxide and water into glucose and oxygen, using energy from sunlight. It takes place in chloroplasts.
光合作用是植物和藻类利用太阳光能，将二氧化碳和水转化为葡萄糖和氧气的过程，该过程在叶绿体中进行。
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
The rate of photosynthesis is limited by light intensity, carbon dioxide concentration and temperature. At low levels, any one of these can be a limiting factor.
光合作用速率受光照强度、二氧化碳浓度和温度的限制。在较低水平下，其中任何一个因素都可能成为限制因子。
In greenhouses, farmers can enhance plant growth by controlling these factors, using artificial lighting, paraffin heaters to add CO₂, and heating to maintain optimum temperature.
在温室中，农民可以通过控制这些因素来促进植物生长，例如使用人工照明、石蜡加热器补充二氧化碳，以及加热以维持最适温度。
The glucose produced is used for respiration, converted into starch for storage, cellulose for cell walls, and combined with nitrates to make amino acids for proteins.
所生成的葡萄糖可用于呼吸作用，转化为淀粉储存，转化为纤维素构建细胞壁，并与硝酸盐结合制造氨基酸进而合成蛋白质。
10. Bioenergetics: Respiration | 生物能量学：呼吸作用
Respiration releases energy stored in glucose; it is an exothermic reaction that happens in all living cells and is essential for cellular processes including muscle contraction and keeping warm.
呼吸作用释放葡萄糖中储存的能量；这是一个放热反应，发生在所有活细胞中，对肌肉收缩和体温维持等细胞活动至关重要。
Aerobic respiration uses oxygen to fully break down glucose, yielding a large amount of ATP:
需氧呼吸利用氧气彻底分解葡萄糖，产生大量ATP：
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O (+ ATP)
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O (+ ATP)
Anaerobic respiration occurs without oxygen. In muscles it converts glucose into lactic acid, causing fatigue. In yeast and plants it produces ethanol and carbon dioxide — fermentation.
无氧呼吸在缺乏氧气时进行。在肌肉中，它将葡萄糖转化为乳酸，导致疲劳；在酵母和植物中则产生乙醇和二氧化碳——即发酵。
Glucose → Lactic acid (animals)
葡萄糖 → 乳酸 （动物）
Glucose → Ethanol + CO₂ (yeast)
葡萄糖 → 乙醇 + CO₂ （酵母）
During vigorous exercise, the oxygen debt builds up; after exercise, deep breathing continues to supply oxygen for breaking down lactic acid into carbon dioxide and water in the liver.
剧烈运动期间会形成氧债；运动后，深呼吸会持续为肝脏提供氧气，以便将乳酸分解为二氧化碳和水。
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