📚 Essential High-Frequency Vocabulary in Biology Exam Papers: A Categorized Compilation | 生物真题高频核心词汇分类汇编
Mastering the precise terminology used in biology examinations is essential for accurately interpreting questions, structuring answers, and demonstrating deep understanding. This compilation categorises the most frequently occurring terms across A-level biology papers, providing clear definitions in both English and Chinese to support bilingual learners. By familiarising yourself with these core terms, you will be better equipped to tackle data analysis, explain mechanisms, and apply concepts confidently in any assessment context.
掌握生物考试中使用的精确术语对于正确解读题目、组织答案和展示深刻理解至关重要。本汇编对A-level生物试卷中最常出现的术语进行分类，提供中英双语清晰定义，以支持双语学习者。熟悉这些核心词汇后，你将更从容地应对数据分析、解释机制，并在任何评价情境中自信运用概念。
1. Cell Structure and Function | 细胞结构与功能
Cell Membrane: A selectively permeable barrier composed of a phospholipid bilayer that controls the movement of substances in and out of the cell, maintaining internal conditions.
细胞膜：由磷脂双分子层构成的选择性渗透屏障，控制物质进出细胞，维持内部环境。
Mitochondrion: The organelle where aerobic respiration occurs, producing ATP which serves as the universal energy currency of the cell.
线粒体：进行有氧呼吸的细胞器，产生作为细胞通用能量货币的ATP。
Ribosome: A small organelle made of rRNA and proteins, either free in the cytoplasm or bound to the rough ER, responsible for translating mRNA into polypeptide chains.
核糖体：由rRNA和蛋白质组成的微小细胞器，游离于细胞质或附着在粗面内质网上，负责将mRNA翻译为多肽链。
Nucleus: The membrane-bound organelle that houses the cell’s genetic material (DNA) and regulates gene expression, thereby controlling cell activities.
细胞核：有膜包被的细胞器，储存遗传物质（DNA）并调控基因表达，从而控制细胞活动。
2. Biological Molecules | 生物分子
Monosaccharide: The simplest carbohydrate unit (e.g. glucose, fructose), which serves as an immediate energy source and acts as a monomer for disaccharides and polysaccharides.
单糖：最简单的碳水化合物单元（如葡萄糖、果糖），作为直接能源并充当二糖和多糖的单体。
Triglyceride: A lipid formed by esterification of one glycerol molecule with three fatty acids; used for long-term energy storage, thermal insulation, and buoyancy.
甘油三酯：由一个甘油分子与三个脂肪酸酯化形成的脂质，用于长期储能、隔热和提供浮力。
Polypeptide: A polymer of amino acids linked by peptide bonds; the primary structure that folds into a specific three-dimensional shape to form a functional protein.
多肽：由肽键连接的氨基酸聚合物，作为一级结构折叠成特定三维形状，形成功能性蛋白质。
Nucleotide: The monomer of nucleic acids, consisting of a phosphate group, a pentose sugar (ribose or deoxyribose), and a nitrogenous base (adenine, thymine, cytosine, guanine, or uracil).
核苷酸：核酸的单体，由磷酸基团、戊糖（核糖或脱氧核糖）和含氮碱基（腺嘌呤、胸腺嘧啶、胞嘧啶、鸟嘌呤或尿嘧啶）组成。
3. Enzymes | 酶
Active Site: The specifically shaped region on an enzyme where the substrate binds and the catalytic reaction occurs, often involving a conformational change.
活性位点：酶上具有特定形状的区域，底物在此结合并发生催化反应，常伴随构象变化。
Denaturation: The irreversible loss of an enzyme’s tertiary structure caused by extreme temperature or pH, disrupting the active site and preventing substrate binding.
变性：由于极端温度或pH导致酶三级结构的不可逆丧失，破坏活性位点，阻止底物结合。
Competitive Inhibitor: A molecule structurally similar to the substrate that occupies the active site, reducing the rate of reaction without inactivating the enzyme.
竞争性抑制剂：结构与底物相似的分子，占据活性位点，降低反应速率但不使酶失活。
Rate of Reaction: The speed at which substrate is converted into product, often measured as the change in concentration per unit time and affected by enzyme concentration, temperature, and pH.
反应速率：底物转化为产物的速度，通常以单位时间浓度变化衡量，受酶浓度、温度和pH影响。
4. Cell Membranes and Transport | 细胞膜与运输
Phospholipid Bilayer: The fundamental structure of cell membranes, consisting of two layers of phospholipids with hydrophilic heads outward and hydrophobic tails inward, providing selective permeability.
磷脂双分子层：细胞膜的基本结构，由两层磷脂组成，亲水头向外、疏水尾向内，赋予选择通透性。
Diffusion: The passive net movement of small, non-polar molecules from a region of higher concentration to a region of lower concentration down the concentration gradient.
扩散：小的非极性分子顺浓度梯度从高浓度区域向低浓度区域的被动净移动。
Osmosis: The net movement of water molecules through a partially permeable membrane from a region of higher water potential to a region of lower water potential.
渗透作用：水分子通过部分透性膜从较高水势区域向较低水势区域的净移动。
Active Transport: The energy-requiring movement of ions or molecules across a membrane against their concentration gradient, mediated by specific carrier proteins using ATP.
主动运输：需要能量的离子或分子逆浓度梯度跨膜移动，由特定载体蛋白介导并消耗ATP。
5. Cell Division and Genetics | 细胞分裂与遗传
Mitosis: A nuclear division producing two genetically identical diploid daughter cells, essential for growth, tissue repair, and asexual reproduction.
有丝分裂：产生两个遗传相同的二倍体子细胞的核分裂，对生长、组织修复和无性生殖至关重要。
Meiosis: A reduction division in which a diploid cell divides twice to form four genetically non-identical haploid gametes, generating variation through independent assortment and crossing over.
减数分裂：二倍体细胞经两次分裂形成四个遗传不同的单倍体配子的减数过程，通过独立分配和交叉互换产生变异。
Allele: An alternative version of a gene situated at a specific locus on a chromosome; e.g. the allele for brown eyes versus blue eyes.
等位基因：位于染色体特定位点的基因的另一种形式，例如棕色眼睛与蓝色眼睛的等位基因。
Genotype: The genetic makeup of an organism for a particular trait, expressed as the combination of alleles (e.g. BB, Bb, or bb).
基因型：生物体某一性状的遗传组成，以等位基因组合表示（如BB、Bb或bb）。
6. DNA and Protein Synthesis | DNA与蛋白质合成
Transcription: The synthesis of a complementary mRNA strand from a DNA template by RNA polymerase, occurring in the nucleus (eukaryotes).
转录：在RNA聚合酶作用下，以DNA为模板合成一条互补的mRNA链，发生于真核生物的细胞核中。
Translation: The process at the ribosome where the sequence of codons in mRNA is decoded with the help of tRNA to assemble a specific polypeptide.
翻译：在核糖体上，借助tRNA解码mRNA中的密码子序列，组装特定多肽链的过程。
Codon: A triplet of nucleotide bases on mRNA that specifies a particular amino acid or signals the termination of translation.
密码子：mRNA上三个核苷酸碱基组成的序列，指定特定的氨基酸或发出翻译终止的信号。
Anticodon: A triplet of nucleotides on a tRNA molecule complementary to a specific codon, ensuring the correct amino acid is added to the growing polypeptide.
反密码子：tRNA分子上与特定密码子互补的三个核苷酸序列，确保正确的氨基酸被加到延伸的多肽链上。
7. Ecology | 生态学
Ecosystem: A dynamic system comprising all the living organisms (community) in a given area interacting with the abiotic factors (e.g. temperature, soil pH) and involving energy flow and nutrient cycles.
生态系统：包含某一地区所有生物（群落）与非生物因子（如温度、土壤pH）相互作用的动态系统，涉及能量流动与物质循环。
Niche: The specific role an organism plays within its ecosystem, encompassing its habitat, resource use, and interactions with other species.
生态位：生物在其生态系统中扮演的特定角色，涵盖其栖息地、资源利用及与其他物种的相互作用。
Biodiversity: The variety of living organisms in a particular habitat or on Earth, which includes species richness and genetic diversity, often linked to ecosystem stability.
生物多样性：特定栖息地或地球上生物的多样性，包括物种丰富度和遗传多样性，常与生态系统稳定性相关。
Succession: The directional change in species composition over time in a previously uninhabited or disturbed area, from pioneer species to a stable climax community.
演替：在原先无人居住或受干扰的区域，物种组成随时间的定向变化，从先锋物种发展到稳定的顶极群落。
8. Human Physiology | 人体生理学
Alveoli: Microscopic air sacs in the lungs with thin, moist walls and a dense capillary network, providing an enormous surface area for efficient gas exchange.
肺泡：肺内微小的气囊，壁薄而湿润，有致密毛细血管网，为高效气体交换提供巨大表面积。
Nephron: The structural and functional unit of the kidney, which filters blood in the glomerulus and then selectively reabsorbs water and solutes along its tubule to form urine.
肾单位：肾脏的结构与功能单位，在肾小球过滤血液，然后沿其小管选择性重吸收水和溶质，形成尿液。
Synapse: The junction between two neurones or between a neurone and an effector, where neurotransmitters are released to transmit a signal across the synaptic cleft.
突触：两个神经元之间或神经元与效应器之间的连接点，在此释放神经递质以跨突触间隙传递信号。
Antibody: A globular protein produced by plasma cells (activated B-lymphocytes) that specifically binds to an antigen, neutralising pathogens or marking them for destruction by phagocytes.
抗体：由浆细胞（活化的B淋巴细胞）产生的球状蛋白，特异性结合抗原，中和病原体或标记其供吞噬细胞摧毁。
9. Plant Biology | 植物生物学
Xylem: A plant vascular tissue composed of dead, lignified cells that transports
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