📚 Year 12 CAIE Biology: Vocabulary & Terminology Quick Memorization Guide | A Level CAIE 生物词汇术语速记指南
Mastering A Level Biology begins with command of subject-specific terminology. This article presents essential Year 12 CAIE vocabulary, paired with bilingual explanations and memory aids to help you recall difficult terms faster. Instead of cramming, use active associations, root-word analysis, and simple diagrams in your mind.
掌握 A Level 生物要从熟悉学科术语开始。本文整理 Year 12 CAIE 高频词汇，配以中英文解释和速记技巧，帮助你摆脱死记硬背。用联想、词根拆解和大脑简图，让术语记得快、记得牢。
1. Cellular Components & Organelles | 细胞组分与细胞器
Phospholipid bilayer — a double layer of phospholipid molecules that forms the core of cell membranes. The hydrophilic phosphate heads face outward, while hydrophobic fatty acid tails point inward, creating a selectively permeable barrier.
磷脂双分子层 — 构成细胞膜基本骨架的磷脂双层。亲水磷酸头朝外，疏水脂肪酸尾朝内，形成选择透过性屏障。速记：'Phospho-' 联想到 phosphate，'bi' 即两个，像夹心饼干。
Rough endoplasmic reticulum (RER) — a network of membrane-bound sacs studded with ribosomes; synthesises and transports proteins.
粗面内质网 — 膜性扁平囊表面附着核糖体，负责蛋白质的合成与运输。看'粗'字就想到表面有 ribosomes 颗粒。
Golgi apparatus — stack of flattened membrane sacs that modifies, packages, and dispatches proteins and lipids into vesicles.
高尔基体 — 扁平膜囊堆叠而成，对蛋白质和脂质进行修饰、分拣并包裹成囊泡。联想：'go-l-gi' 像物流快递中心，货物（蛋白）打包发车（vesicles）。
Lysosome — membrane-bound vesicle containing hydrolytic enzymes; digests worn-out organelles and engulfed pathogens.
溶酶体 — 含水解酶的膜泡，负责分解衰老细胞器和侵入的病原体。词根 'lyso-' = 溶解，'some' = 体，想象成细胞内的清道夫。
2. Biological Molecules: Carbohydrates & Lipids | 生物分子：碳水化合物与脂质
Monosaccharide — the simplest carbohydrate, a single sugar unit such as glucose (C₆H₁₂O₆) and fructose. They are the monomers that build disaccharides and polysaccharides.
单糖 — 最简单的糖，如葡萄糖和果糖，是构成二糖和多糖的单体。'Mono' = 一，'sacchar' = 糖，把葡萄糖想成一颗独立的糖果。
Glycosidic bond — a covalent bond formed between two monosaccharides via a condensation reaction, releasing one water molecule.
糖苷键 — 两分子单糖通过缩合反应脱去一分子水形成的共价键。记：'glyco-' 糖，'sidic' 像 side，糖分子侧面连接。
Triglyceride — a lipid composed of one glycerol molecule ester-linked to three fatty acid chains. Functions as a long-term energy store and thermal insulator.
甘油三酯 — 由一分子甘油与三分子脂肪酸通过酯键形成的脂质，作为长效能源和隔热层。'Tri-' = 三，'glyceride' 联想到甘油，想象一个甘油背心连着三条尾巴。
Phospholipid — similar to a triglyceride but with one fatty acid replaced by a phosphate-containing group, making the molecule amphipathic.
磷脂 — 与甘油三酯相似，但一条脂肪酸被含磷酸基团取代，故分子既亲水又疏水。记忆：'phospho-' 头喜欢水，尾巴怕水，自然形成 bilayer。
3. Biological Molecules: Proteins & Nucleic Acids | 生物分子：蛋白质与核酸
Amino acid — the monomer of proteins, consisting of a central carbon bonded to an amino group (–NH₂), a carboxyl group (–COOH), a hydrogen, and an R group.
氨基酸 — 蛋白质的单体，中心碳连接氨基、羧基、氢和 R 基。'Amino' 指含氮基团，想象小人左手氨基右手羧基，帽子是不同 R 团。
Peptide bond — a covalent C–N bond formed between the carboxyl group of one amino acid and the amino group of another during a condensation reaction.
肽键 — 一分子氨基酸的羧基与另一分子氨基酸的氨基脱去水后形成的 C–N 键。像氨基酸手拉手，手腕处就是 peptide bond。
Primary structure — the unique sequence of amino acids in a polypeptide chain, determined by DNA. It dictates all higher levels of folding.
一级结构 — 多肽链中氨基酸的线性序列，由 DNA 决定，决定了高级折叠。好比一个单词的字母顺序，拼错就失效。
Nucleotide — the monomer of nucleic acids, composed of a pentose sugar, a nitrogenous base, and one or more phosphate groups. ATP is a nucleotide derivative.
核苷酸 — 核酸的单体，含五碳糖、含氮碱基和磷酸基团。ATP 是核苷酸衍生物。'Nucleo-' 核，联想到细胞核里的遗传物质，'tide' 节奏，像四个字母的密码链。
4. Enzymes: Key Terms & Kinetics | 酶：关键术语与动力学
Active site — a specific region on the enzyme surface, shaped by tertiary structure, where the substrate binds and catalysis occurs.
活性位点 — 酶表面由三级结构形成的特定区域，底物与之结合并发生催化。把酶想成锁，active site 是锁孔，底物是钥匙。
Lock-and-key hypothesis — proposes that the substrate fits precisely into a rigid active site, much like a key into a lock.
锁钥假说 — 底物能精确嵌入固定活性位点，如钥匙插入锁孔。虽然后来被 induced-fit 模型修正，但作为入门速记非常形象。
Induced-fit model — the active site is not perfectly complementary; binding of substrate induces a conformational change that tightens the fit and strains bonds.
诱导契合模型 — 活性位点并非完美匹配，底物结合诱导酶构象改变，使结合更紧密并拉扯底物键。想象握手时手套主动抱紧手指。
Vmax — the maximum initial velocity of an enzyme-catalysed reaction when all enzyme active sites are saturated with substrate.
Vmax（最大反应速度） — 酶活性位点被底物饱和时的极限反应速率。只要想到所有出租车满座，速度就封顶。
5. Cell Membrane & Transport Processes | 细胞膜与运输过程
Fluid mosaic model — describes the membrane as a phospholipid bilayer with embedded proteins, where both lipids and proteins can move laterally, making the membrane fluid and dynamically patterned.
流动镶嵌模型 — 膜由磷脂双分子层与嵌合蛋白质组成，脂质和蛋白质可侧向移动，赋予膜流动性和马赛克图案。'fluid' 流动，'mosaic' 镶嵌，想象五彩蛋白在油面上漂移。
Simple diffusion — the net movement of small, non-polar molecules from a region of higher concentration to a region of lower concentration directly through the bilayer, without using metabolic energy.
简单扩散 — 小而非极性的分子直接穿越双层，由高浓度向低浓度净移动，不耗能。'Simple' 简单，无需门卫。
Facilitated diffusion — passive transport through channel or carrier proteins down a concentration gradient; still no ATP required.
协助扩散 — 借助通道蛋白或载体蛋白顺浓度梯度的被动运输，仍不需 ATP。就像旋转门，人（溶质）顺人潮流入，比翻越围墙省力。
Active transport — movement of molecules against their concentration gradient via specific carrier proteins, requiring energy from ATP hydrolysis.
主动运输 — 分子逆浓度梯度通过特异载体蛋白的运输，需消耗 ATP 水解的能量。'Active' 要主动做功，好比推车上坡费力。
6. The Cell Cycle & Mitosis | 细胞周期与有丝分裂
Interphase — the longest phase of the cell cycle, during which the cell grows, carries out normal metabolic activities, and duplicates its DNA (S phase) and organelles.
分裂间期 — 细胞周期中时间最长的阶段，细胞生长、正常代谢、复制 DNA（S 期）和细胞器。'Inter-' 在两轮分裂之间，细胞悄悄准备。
Prophase — first stage of mitosis: chromatin condenses into visible chromosomes, each consisting of two sister chromatids joined at the centromere; the nucleolus disappears and the spindle fibres begin to form.
前期 — 染色质凝缩成可见染色体，每条染色体含两条姐妹染色单体，由着丝粒相连；核仁消失，纺锤体出现。'Pro-' 前，万事俱备。
Metaphase — chromosomes align at the cell's equator (metaphase plate), guided by kinetochore microtubules.
中期 — 染色体在纺锤丝牵引下排列于赤道板（中期板）。'Meta-' 中间，像排队站在中线。
Anaphase — centromeres split, sister chromatids are pulled to opposite poles by shortening spindle fibres.
后期 — 着丝粒分裂，姐妹染色单体被纺锤丝拉向细胞两极。'Ana-' 向上、分开，想象拉开拉链。
Telophase — chromatids reach the poles, chromosomes decondense, nuclear envelopes reform around each set of chromosomes.
末期 — 染色单体到达两极，染色体解旋，核膜重新形成。'Telo-' 末端，一切归位。
7. DNA Replication & Protein Synthesis | DNA 复制与蛋白质合成
DNA polymerase — an enzyme that synthesises new DNA strands by adding free DNA nucleotides complementary to the template strand, always working in the 5' to 3' direction.
DNA 聚合酶 — 以模板链为蓝图，按碱基互补配对添加游离核苷酸合成新链，合成方向为 5' → 3'。可记成复印机的滚轮，沿模板单向前进。
Transcription — the process by which a gene's DNA sequence is copied into a complementary mRNA strand by RNA polymerase.
转录 — 以基因 DNA 为模板，由 RNA 聚合酶合成互补 mRNA 的过程。'trans-' 转，抄写一份临时副本。
Translation — the process in which ribosomes decode mRNA to produce a specific polypeptide chain using tRNA adaptors and their attached amino acids.
翻译 — 核糖体解读 mRNA 密码子，依靠 tRNA 搬运对应氨基酸合成肽链。就像把核酸语言翻译成蛋白质语言。
Codon — a sequence of three mRNA nucleotides that codes for one specific amino acid or a stop signal.
密码子 — mRNA 上三个相邻核苷酸构成的三联体，对应一个氨基酸或终止信号。'Codon' 像 code+on，mRNA 上的代码条。
8. Transport in Plants | 植物运输
Xylem — a vascular tissue transporting water and dissolved mineral ions upwards from roots to shoots. It consists of dead, hollow tubes strengthened with lignin.
木质部 — 由死细胞构成的中空管道，壁含木质素，负责向上运输水分和矿质离子。Xylem 读音像 'zylum'，想象树体内竖向水管。
Phloem — living vascular tissue composed of sieve tube elements and companion cells; transports sucrose and amino acids both up and down the plant (translocation).
韧皮部 — 由筛管与伴随细胞组成的活组织，双向运输蔗糖和氨基酸。Phloem 读音 'flo-em'，联想 food flows 从这里走。
Transpiration pull — the suction force generated by water evaporation from mesophyll cells that pulls water up through the xylem in a continuous column, helped by cohesion and adhesion.
蒸腾拉力 — 叶肉细胞水分蒸发产生的负压，借助内聚力和附着力将水柱沿木质部向上拉起。想象用吸管吸水，叶面就是吸口。
Source and sink — in translocation, the source is a region where sucrose is loaded into phloem (e.g., leaves), while the sink is where it is unloaded and used (e.g., root tips, developing fruits).
源与库 — 源是装上蔗糖的起始点（如成熟叶片），库是卸载利用蔗糖的终点（如根尖、果实）。'Source' 发源，'sink' 下沉吸收，糖分从源到库流动。
9. Transport in Mammals | 哺乳动物体内运输
Haemoglobin — a quaternary-structured protein in red blood cells; it reversibly binds oxygen (forming oxyhaemoglobin) for delivery to tissues.
血红蛋白 — 红细胞内四级结构蛋白，可逆结合氧气（氧合血红蛋白），运氧至组织。Heme- 铁，-globin 球状，想象含铁小球快递氧气。
Oxygen dissociation curve — a graph showing the relationship between the partial pressure of oxygen and the percentage saturation of haemoglobin. Its sigmoid shape arises from cooperative binding.
氧离曲线 — 反映氧分压与血红蛋白氧饱和度关系的 S 形曲线，因协同结合而呈 S 形。S 形就像血红蛋白的懒人模式：开始难，等有人带头后迅速抢座。
Bohr effect — a decrease in pH (increase in CO₂ concentration) reduces haemoglobin's affinity for oxygen, shifting the dissociation curve to the right, promoting oxygen unloading in respiring tissues.
玻尔效应 — pH 下降升高 CO₂ 时，血红蛋白对氧亲和力降低，曲线右移，有利于组织获氧。记法：活跃组织产酸产 CO₂，'Bohr' 谐音 '波儿'，一波把氧弹下。
Cardiac cycle — the sequence of events in one heartbeat, consisting of atrial systole, ventricular systole, and diastole.
心动周期 — 一次心跳的完整过程，包括心房收缩、心室收缩和全心舒张。记三个音节：systole 收，diastole 舒，像泵水。
10. Gas Exchange Systems | 气体交换系统
Alveoli — tiny air sacs at the terminal ends of bronchioles in the lungs, surrounded by a dense network of capillaries; the site of gas exchange in mammals.
肺泡 — 肺内细支气管末端的微小气囊，外包丰富毛细血管网，是哺乳动物气体交换的场所。'Alveoli' 有点像泡泡，想象成葡萄串，每一粒都是交换站。
Surfactant — a phospholipid mixture secreted by alveolar cells, reduces surface tension inside alveoli to prevent collapse during exhalation.
表面活性物质 — 肺泡细胞分泌的磷脂混合物，降低表面张力以防呼气时肺泡塌陷。记 'surface act ant'，表面做蚂蚁活的小帮手。
Partial pressure — the pressure contributed by a single gas in a mixture of gases; diffusion of O₂ and CO₂ occurs down partial pressure gradients.
分压 — 混合气体中某一种气体单独产生的压力，O₂ 和 CO₂ 沿分压梯度扩散。就好像每种气都有一份自己的推力。
Ventilation — the mass flow of fresh air into and out of the lungs, maintained by the diaphragm and intercostal muscles.
通气 — 由膈肌和肋间肌驱动的大块气流进出肺，确保分压梯度持续更新。'Vent' 像通风扇把空气推进推出。
11. Infectious Diseases & Immunity | 传染病与免疫
Antigen — a molecule (often on a pathogen's surface) that is recognised as foreign by the immune system and triggers an immune response, typically involving antibody production.
抗原 — 被免疫系统识别为异物的分子（常在病原体表面），能触发免疫应答，常激发抗体生成。'Anti-' 抗，'gen' 产生，入侵标签。
Antibody — Y-shaped glycoprotein (immunoglobulin) secreted by plasma cells, specific to an antigen. It neutralises pathogens by agglutination, precipitation, or opsonisation.
抗体 — 浆细胞分泌的 Y 形糖蛋白，与特定抗原结合，通过凝集、沉淀或调理作用清除病原。想象 Y 形叉子卡住抗原，防止其感染细胞。
Phagocytosis — a process in which phagocytes (e.g., neutrophils, macrophages) engulf and digest pathogens or debris, forming a phagosome that fuses with lysosomes.
吞噬作用 — 吞噬细胞包吞并水解病原体或碎屑，形成吞噬体后与溶酶体融合。'Phago-' 吃，'cytosis' 细胞进行中，像细胞张嘴吃掉入侵者。
Active immunity — long-term protection achieved when the body produces its own antibodies and memory cells after encountering an antigen (natural infection or vaccination).
主动免疫 — 接触抗原后（天然感染或疫苗）自身产生抗体和记忆细胞，形成长期保护。主动 = 自身动手制造武器。
Passive immunity — short-term immunity conferred by injecting ready-made antibodies (e.g., from mother to infant via milk, or through antiserum).
被动免疫 — 直接注入现成抗体（如母体乳汁传递或抗血清）获得的短期保护。被动 = 直接领武器，用完就没了。
| Term (English) | 中文术语 | Memory Hook | 速记钩子 |
|---|---|---|
| Opsonisation | 调理作用 | Antibody 'paints' pathogen, making it tasty for phagocytes / 抗体给病原体抹上'酱汁'，吞噬细胞爱吃 |
| T-lymphocyte | T 淋巴细胞 | T for thymus maturation / T 表示胸腺成熟，负责细胞免疫 |
| B-lymphocyte | B 淋巴细胞 | B for bone marrow origin; makes antibodies / B 来自骨髓，生产抗体 |
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