📚 Year 10 SQA Biology: Core Knowledge Review | Year 10 SQA 生物：核心知识点梳理
This comprehensive guide covers the essential topics in Year 10 SQA Biology, providing clear explanations of key concepts to support your revision and deep understanding. From the microscopic world of cells to the complexities of ecosystems, each section builds a solid foundation for GCSE-level biology and prepares you for assessments.
这份全面指南涵盖了 Year 10 SQA 生物的核心课题，对关键概念进行了清晰的解释，旨在帮助你复习并加深理解。从微观的细胞世界到复杂的生态系统，每个部分都将为你打下坚实的 GCSE 生物学基础，并为考试做好准备。
1. Cell Structure and Function | 细胞结构与功能
All living organisms are composed of cells, which are the basic structural and functional units of life. The cell theory states that cells arise from pre-existing cells, and all metabolic reactions occur within them.
所有生物体都由细胞组成，细胞是生命的基本结构和功能单位。细胞学说指出，细胞由已存在的细胞产生，所有代谢反应都在细胞内进行。
Animal cells contain a nucleus that controls the cell's activities and stores genetic material, cytoplasm where many metabolic reactions take place, a selectively permeable cell membrane, mitochondria for aerobic respiration, and ribosomes for protein synthesis. Plant cells have all these structures plus a rigid cell wall made of cellulose, a large permanent vacuole that stores cell sap, and chloroplasts which are the site of photosynthesis.
动物细胞包含控制细胞活动并储存遗传物质的细胞核、发生许多代谢反应的细胞质、具有选择透过性的细胞膜、用于有氧呼吸的线粒体以及负责蛋白质合成的核糖体。植物细胞除了具备以上所有结构外，还有由纤维素构成的坚固细胞壁、储存细胞液的大液泡以及进行光合作用的叶绿体。
2. Transport Across Cell Membranes | 物质跨膜运输
The cell membrane controls the movement of substances in and out of the cell. Diffusion is the passive net movement of particles from a region of high concentration to a region of low concentration down a concentration gradient. Oxygen and carbon dioxide move into and out of cells by diffusion.
细胞膜控制物质进出细胞。扩散是指微粒顺浓度梯度从高浓度区域向低浓度区域的被动净移动。氧气和二氧化碳通过扩散进出细胞。
Osmosis is a special type of diffusion involving the movement of water molecules through a selectively permeable membrane from a dilute solution to a more concentrated solution. In plant cells, water entering by osmosis makes the cell turgid, while water loss leads to plasmolysis. Active transport requires energy from ATP to move molecules against their concentration gradient, for example the absorption of mineral ions by root hair cells.
渗透是一种特殊的扩散，指水分子通过选择透过性膜从稀溶液向浓溶液移动的过程。在植物细胞中，水通过渗透进入会使细胞变得硬挺，而水分流失则导致质壁分离。主动运输需要 ATP 提供的能量来逆浓度梯度移动分子，例如根毛细胞对无机盐离子的吸收。
3. DNA and Protein Synthesis | DNA 与蛋白质合成
DNA (deoxyribonucleic acid) is a double-stranded molecule that carries the genetic code for the production of proteins. Its structure is a double helix with complementary base pairing: adenine pairs with thymine, and cytosine pairs with guanine. Genes are specific sequences of DNA that code for particular proteins.
DNA（脱氧核糖核酸）是一种双链分子，携带着合成蛋白质的遗传密码。它的结构是双螺旋，碱基互补配对：腺嘌呤与胸腺嘧啶配对，胞嘧啶与鸟嘌呤配对。基因是编码特定蛋白质的 DNA 序列。
Protein synthesis involves two main stages: transcription and translation. In transcription, a complementary mRNA copy of the gene is produced. The mRNA then moves to a ribosome, where translation occurs: the genetic code in the mRNA is read, and amino acids are assembled in the correct order to form a protein. The sequence of bases in DNA determines the sequence of amino acids, which determines the protein's shape and function.
蛋白质合成主要包括两个步骤：转录和翻译。在转录阶段，基因的一条链被用来合成互补的 mRNA。然后 mRNA 移动到核糖体进行翻译：核糖体读取 mRNA 上的遗传密码，并将氨基酸按正确顺序连接形成蛋白质。DNA 中的碱基序列决定了氨基酸序列，进而决定了蛋白质的形状和功能。
4. Enzymes and Metabolism | 酶与代谢
Enzymes are biological catalysts made of protein that speed up chemical reactions without being used up. Every enzyme has an active site with a specific shape complementary to its substrate. The 'lock and key' model explains how the substrate fits precisely into the active site, forming an enzyme-substrate complex.
酶是由蛋白质构成的生物催化剂，能加快化学反应速度而自身不被消耗。每种酶都有一个特定形状的活性位点，与其底物互补。“锁钥模型”解释了底物如何精确嵌入活性位点，形成酶-底物复合物。
Enzyme activity is affected by temperature and pH. Each enzyme has an optimum temperature and pH at which it works fastest. Extremes of temperature or pH can cause the enzyme to denature, changing the shape of the active site permanently and preventing substrate binding. Enzymes are essential in metabolism, including digestive enzymes like amylase that breaks starch into maltose, and catalase that breaks down hydrogen peroxide.
酶活性受温度和 pH 值的影响。每种酶都有其发挥最快反应速率的最适温度和 pH 值。过高或过低的温度或 pH 会导致酶变性，永久改变活性位点形状，使底物无法结合。酶在新陈代谢中不可或缺，包括将淀粉分解为麦芽糖的淀粉酶，以及分解过氧化氢的过氧化氢酶。
5. 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, repair and asexual reproduction. Before mitosis, the DNA replicates so each chromosome consists of two chromatids. During mitosis, the chromosomes line up at the equator of the cell, the chromatids separate, and two new nuclei form, followed by division of the cytoplasm.
有丝分裂产生两个遗传物质相同的子细胞，用于生长、修复和无性繁殖。在有丝分裂之前，DNA 会进行复制，因此每条染色体包含两个染色单体。在有丝分裂过程中，染色体排列在细胞赤道板上，染色单体分离形成两个新细胞核，随后细胞质分裂。
Meiosis is a reduction division that produces four genetically different haploid gametes. It involves two divisions and results in half the number of chromosomes. In meiosis, homologous chromosomes pair up and exchange genetic material through crossing over, increasing genetic variation. Fertilisation restores the diploid number when male and female gametes fuse.
减数分裂是一种减数分裂，产生四个遗传组成不同的单倍体配子。它包含两次分裂，使染色体数目减半。在减数分裂中，同源染色体配对并通过交叉互换交换遗传物质，从而增加遗传变异。受精时，雄性和雌性配子融合，恢复二倍体染色体数目。
6. Genetics and Inheritance | 遗传与变异
Genetics is the study of heredity and variation. A gene may exist in different forms called alleles. An individual with two identical alleles for a trait is homozygous, while one with two different alleles is heterozygous. The phenotype is the observable characteristic, and the genotype is the combination of alleles.
遗传学是研究遗传和变异的科学。一个基因可能以不同形式存在，称为等位基因。如果一个个体的某个性状具有两个相同的等位基因，则为纯合子；如果有两个不同的等位基因，则为杂合子。表现型是可观察到的性状，而基因型是等位基因的组合。
in pea plants, the allele for tall stems (T) is dominant over the allele for short stems (t). A cross between two heterozygous tall plants (Tt × Tt) produces offspring in a 3:1 phenotypic ratio. Some genetic disorders, like cystic fibrosis, are caused by recessive alleles.
单基因遗传遵循可用庞纳特方格预测的模式。一些等位基因是显性的，另一些是隐性的。例如，在豌豆植株中，高茎的等位基因（T）对矮茎的等位基因（t）为显性。两个杂合高茎植株杂交（Tt × Tt）产生的后代表现型比例为 3:1。一些遗传病，如囊性纤维化，是由隐性等位基因引起的。
7. Evolution and Natural Selection | 进化与自然选择
Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring. Variation exists within a population, and those with advantageous traits are more likely to survive, reproduce and pass on those alleles. Over many generations, the frequency of favourable alleles increases in the gene pool.
自然选择是指更能适应环境的生物更容易存活并繁殖更多后代的过程。种群中存在变异，拥有有利性状的个体更可能生存、繁殖并将这些等位基因传递下去。经历许多世代后，有利等位基因在基因库中的频率会上升。
A classic example is the evolution of antibiotic resistance in bacteria. When a population of bacteria is exposed to an antibiotic, most are killed, but any mutant bacteria with a resistance allele survive. These resistant bacteria multiply, and soon the population consists mainly of resistant strains. This is evolution by natural selection, demonstrating the importance of completing antibiotic courses to prevent resistance spreading.
一个经典例子是细菌抗生素耐药性的进化。当细菌种群接触到抗生素时，大多数会被杀死，但任何具有耐药性等位基因的突变细菌都能存活。这些耐药细菌繁殖，很快种群便主要由耐药性菌株构成。这就是自然选择驱动的进化，也说明了完成抗生素疗程以防止耐药性扩散的重要性。
8. Ecosystems and Energy Flow | 生态系统与能量流动
An ecosystem consists of a community of living organisms interacting with each other and their non-living environment. The source of energy for almost all ecosystems is the sun. Producers, such as green plants and algae, capture light energy during photosynthesis and convert it into chemical energy stored in biomass.
生态系统由生物群落及其与之相互作用的非生物环境构成。几乎所有生态系统的能量来源都是太阳。生产者，如绿色植物和藻类，在光合作用中捕获光能并将其转化为储存在生物量中的化学能。
Energy passes along food chains and food webs. At each trophic level, most of the energy is lost through respiration, movement, heat and undigested material. Typically, only about 10% of the energy in one trophic level is transferred to the next. This loss limits the length of food chains. Pyramids of energy and pyramids of numbers visually represent these feeding relationships and energy transfers.
能量沿着食物链和食物网流动。在每一个营养级，大部分能量通过呼吸作用、运动、散热以及未消化物质等途径散失。通常只有约 10% 的能量从一个营养级传递到下一个营养级。这种能量损耗限制了食物链的长度。能量金字塔和数量金字塔可以直观地表示这些捕食关系和能量传递。
9. Sampling Techniques and Biodiversity | 取样技术与生物多样性
Biodiversity is the variety of different species living in a habitat. Ecologists use sampling techniques to estimate population sizes and distribution. Common methods include using a quadrat to sample plants or slow-moving organisms, and a pitfall trap to capture small ground-dwelling animals.
生物多样性是指栖息地中不同物种的种类多样性。生态学家使用取样技术来估算种群大小和分布。常用方法包括使用样方来对植物或行动缓慢的生物进行取样，以及使用陷阱诱捕器捕获地面上的小动物。
To ensure results are valid and reliable, samples should be random and repeated. A transect line can be used to study how the distribution of organisms changes across an area, such as from a shaded woodland to open grassland. Abiotic factors like light intensity, temperature and soil pH can be measured to explain the distribution patterns observed. Human activities can reduce biodiversity, but conservation measures help protect ecosystems.
为了确保结果有效且可靠，取样应随机并多次重复。可以使用样线法来研究生物分布如何随区域变化，比如从阴蔽的林地到开阔的草原。可以测量光照强度、温度和土壤 pH 等非生物因素，以解释观察到的分布模式。人类活动会降低生物多样性，但保护措施有助于保护生态系统。
10. Human Physiology: The Circulatory System | 人体生理：循环系统
The circulatory system consists of the heart, blood vessels and blood. Its main functions are to transport oxygen, nutrients, hormones and waste products around the body. The heart is a double pump: the right side pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the rest of the body.
循环系统由心脏、血管和血液组成。它的主要功能是在全身运输氧气、营养物质、激素和废物。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身体其他部位。
Arteries have thick muscular walls to withstand high pressure and carry blood away from the heart; veins have thinner walls and valves to prevent backflow; capillaries are one-cell thick to allow efficient exchange of substances. Red blood cells contain haemoglobin, which binds oxygen, while white blood cells fight infection. Platelets are involved in blood clotting.
动脉管壁厚实且有肌肉，能承受高压，将血液带离心脏；静脉管壁较薄并有瓣膜防止血液倒流；毛细血管仅有一层细胞厚度，便于物质进行高效交换。红细胞含有血红蛋白，能结合氧气，而白细胞则抵抗感染。血小板参与血液凝固。
11. Human Physiology: The Respiratory System | 人体生理：呼吸系统
The respiratory system enables gas exchange: oxygen is taken into the body and carbon dioxide is removed. Air enters through the nose or mouth, passes down the trachea, bronchi and bronchioles, and finally reaches the alveoli, tiny air sacs surrounded by capillaries.
呼吸系统实现气体交换：氧气进入体内，二氧化碳被排出。空气通过鼻或口进入，沿气管、支气管和细支气管下行，最后到达肺泡，即被毛细血管包围的微小气囊。
In the alveoli, oxygen diffuses into the blood and carbon dioxide diffuses out of the blood down their concentration gradients. The alveoli are adapted for gas exchange by having a large surface area, thin walls and a rich blood supply. Breathing involves the diaphragm and intercostal muscles, which change the volume and pressure in the thorax to draw air in (inhalation) and force it out (exhalation).
在肺泡中，氧气顺浓度梯度扩散进入血液，二氧化碳则从血液中扩散出去。肺泡通过具有巨大表面积、极薄管壁和丰富的血液供应来适应气体交换。呼吸运动涉及膈肌和肋间肌，它们改变胸腔的体积和压力，以吸入空气（吸气）并排出空气（呼气）。
Cell respiration is the process that releases energy from glucose. The summary equation for aerobic respiration is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP. This energy is used for cellular activities such as muscle contraction, active transport and maintaining body temperature.
细胞呼吸是从葡萄糖中释放能量的过程。有氧呼吸的总方程式为：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP。这些能量用于肌肉收缩、主动运输和维持体温等细胞活动。
12. Reproduction and Development | 生殖与发育
Sexual reproduction involves the fusion of male and female gametes to form a zygote, which develops into a new individual. In humans, sperm are produced in the testes, and eggs (ova) are produced in the ovaries. Fertilisation occurs in the oviduct, and the fertilised egg implants into the uterus lining.
有性生殖涉及雄性和雌性配子融合形成受精卵，进而发育为新个体。在人类中，精子在睾丸中产生，卵子在卵巢中产生。受精发生在输卵管中，受精卵随后植入子宫内膜。
The placenta is an organ that allows exchange of materials between the mother and the developing fetus without the two blood supplies mixing. Oxygen and nutrients diffuse from the mother's blood into the fetal blood, while carbon dioxide and waste products diffuse in the opposite direction. During puberty, sex hormones bring about the development of secondary sexual characteristics, such as facial hair in males and breast development in females.
胎盘是一个器官，能在母亲和发育中的胎儿之间进行物质交换，而且两者的血液并不混合。氧气和营养物质从母亲的血液扩散进入胎儿血液，而二氧化碳和废物则反向扩散。在青春期，性激素促使第二性征的发育，例如男性的面部毛发和女性的乳房发育。
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