AP Biology Core Vocabulary by Exam Topic Classification | AP 生物学真题分类核心词汇

📚 AP Biology Core Vocabulary by Exam Topic Classification | AP 生物学真题分类核心词汇

A strong command of terminology is crucial for success on the AP Biology exam. This article categorizes high-frequency vocabulary from past exam questions, helping you connect terms to the topics where they are most often tested. Understanding these core terms in both English and Chinese will deepen your conceptual clarity and improve your performance on multiple-choice and free-response questions.

熟练掌握术语是 AP 生物学考试成功的关键。本文根据历年真题对高频词汇进行分类，帮助你将这些术语与常考主题联系起来。以中英文双解释这些核心词汇可以加深概念理解，提高选择题和自由回答题的得分。

1. Chemistry of Life: Elements and Water | 生命化学：元素与水

Hydrogen Bond: A weak attraction between a hydrogen atom covalently bonded to an electronegative atom (usually oxygen or nitrogen) and another electronegative atom. Hydrogen bonds give water its cohesive and adhesive properties, stabilize protein secondary structures (alpha-helices and beta-sheets), and hold the two strands of DNA together. In AP questions, hydrogen bonding is frequently used to explain water transport in plants and the specificity of base pairing.

氢键：一个共价结合于电负性原子（通常是氧或氮）的氢原子与另一个电负性原子之间的弱吸引力。氢键赋予水内聚力和附着力，稳定蛋白质二级结构（α-螺旋和β-折叠），并使 DNA 双链结合在一起。在 AP 考题中，氢键常用于解释植物体内水分运输以及碱基配对的专一性。

Cohesion: The attraction between molecules of the same substance. In water, cohesion results from hydrogen bonds and creates surface tension, allowing small insects to walk on water. It also enables transpiration pull, where water molecules form a continuous column in xylem vessels, a phenomenon commonly featured in plant physiology FRQs.

内聚力：同种物质分子之间的吸引力。水中内聚力由氢键产生，形成表面张力，使小型昆虫能在水面上行走。它还促成蒸腾拉力，使木质部导管中的水分子形成连续水柱，这一现象常在植物生理学自由回答题中出现。

Specific Heat: The amount of heat required to raise the temperature of 1 gram of a substance by 1°C. Water has an exceptionally high specific heat due to hydrogen bonding, which allows large bodies of water to moderate coastal climates and helps organisms maintain stable internal temperatures. Exam items may ask why water’s high specific heat is advantageous for life.

比热容：使1克物质温度升高1°C所需的热量。由于氢键，水具有极高的比热容，这使得大面积水体能够调节沿海气候并帮助生物体维持恒定的体温。考题可能会询问水的高比热容为何对生命有利。

Polar Covalent Bond: A type of covalent bond where electrons are shared unequally between atoms with different electronegativities, creating partial positive and negative charges. In a water molecule, oxygen is more electronegative than hydrogen, generating a dipole that makes water a universal solvent for charged and polar substances. This concept underpins questions on solubility and the properties of functional groups.

极性共价键：电负性不同的原子之间电子共享不均等而产生的一种共价键，形成部分正电荷和部分负电荷。在水分子中，氧的电负性大于氢，产生偶极，使水成为带电和极性物质的万能溶剂。这一概念是有关溶解性与官能团性质考题的基础。

Functional Group: A specific grouping of atoms within a molecule that has characteristic chemical properties. Common functional groups in biology include hydroxyl (–OH), carboxyl (–COOH), amino (–NH₂), and phosphate (–PO₄). These groups determine the reactivity of biomolecules and are often displayed in AP questions asking students to identify molecular interactions or predict behavior in aqueous environments.

官能团：分子中具有特征化学性质的特定原子组合。生物学中常见的官能团包括羟基（–OH）、羧基（–COOH）、氨基（–NH₂）和磷酸基（–PO₄）。这些基团决定了生物分子的反应性，并常在 AP 考题中要求考生识别分子间相互作用或预测在水环境中的行为。

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2. Macromolecules | 生物大分子

Dehydration Synthesis: A chemical reaction in which two monomers are joined together by removing a water molecule. This anabolic process builds polymers such as polysaccharides, proteins, and nucleic acids. On the exam, dehydration synthesis is contrasted with hydrolysis, and students may be asked to identify which reaction forms a peptide bond or a glycosidic linkage.

脱水合成：通过脱去一分子水将两个单体连接在一起的化学反应。这一合成代谢过程可构建多糖、蛋白质和核酸等聚合物。在考试中，脱水合成常与水解反应对比，考生可能需要识别形成肽键或糖苷键的反应是哪一种。

Hydrolysis: The cleavage of a polymer into monomers by adding a water molecule. Hydrolysis is catalyzed by enzymes during digestion and cellular recycling, breaking glycosidic, peptide, and phosphodiester bonds. AP multiple-choice questions frequently test the distinction between hydrolysis and condensation reactions.

水解：通过加入水分子将聚合物裂解为单体的过程。消化和细胞内循环中的酶催化水解反应，断开糖苷键、肽键和磷酸二酯键。AP 选择题常考查水解与缩合反应的区别。

Peptide Bond: A covalent bond formed between the carboxyl group of one amino acid and the amino group of another, releasing a water molecule. Peptide bonds link amino acids into polypeptide chains, which later fold into functional proteins. Questions on protein structure often require students to locate peptide bonds in a given diagram or to explain how they are affected by denaturation.

肽键：一个氨基酸的羧基与另一个氨基酸的氨基之间脱去水分子后形成的共价键。肽键将氨基酸连接成多肽链，多肽链随后折叠成有功能的蛋白质。有关蛋白质结构的题目经常要求学生在给定示意图中找到肽键，或解释变性如何影响肽键。

Phospholipid: A lipid molecule composed of two fatty acids, a glycerol backbone, and a phosphate group. The phosphate head is hydrophilic, while the fatty acid tails are hydrophobic. This amphipathic nature drives the formation of the phospholipid bilayer, the fundamental structure of cell membranes. AP FRQs regularly use the properties of phospholipids to explain membrane permeability and vesicle formation.

磷脂：由两个脂肪酸、一个甘油骨架和一个磷酸基组成的脂质分子。磷酸头部亲水，脂肪酸尾部疏水。这种两亲性驱动磷脂双层形成，这是细胞膜的基本结构。AP 自由回答题常利用磷脂特性解释膜的通透性和囊泡的形成。

Denaturation: The process by which a protein loses its native three-dimensional structure due to disruption of hydrogen bonds, ionic interactions, and hydrophobic interactions, often caused by changes in pH, temperature, or salt concentration. Denaturation results in loss of function but does not break peptide bonds. Exam questions may ask how extreme environments alter enzyme activity.

变性：蛋白质因氢键、离子键和疏水相互作用被破坏而失去其天然三维结构的过程，通常由 pH、温度或盐浓度的变化引起。变性使蛋白质失去功能但不破坏肽键。考试可能问到极端环境如何改变酶活性。

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3. Cell Structure and Organelles | 细胞结构与细胞器

Endosymbiotic Theory: The theory that mitochondria and chloroplasts originated from free-living prokaryotes that were engulfed by an ancestral eukaryotic cell. Evidence includes the presence of their own circular DNA, ribosomes similar to prokaryotes, and autonomous replication. This is a classic AP topic, often appearing in long essays about the evolution of eukaryotic complexity.

内共生理论：认为线粒体和叶绿体起源于被祖先真核细胞吞噬的独立生活的原核生物。证据包括它们拥有自身的环状 DNA、与原核生物相似的核糖体以及自主复制能力。这是 AP 经典考点，常出现在关于真核复杂性的长论文中。

Cristae: Infoldings of the inner mitochondrial membrane that greatly increase surface area for the electron transport chain and ATP synthase. The number of cristae correlates with a cell’s energy demand. Students may be asked to predict the abundance of cristae in muscle cells versus skin cells.

嵴：线粒体内膜向内折叠的结构，大大增加了电子传递链和 ATP 合酶所需的表面积。嵴的数量与细胞的能量需求相关。考试可能要求学生预测肌肉细胞与皮肤细胞中嵴的丰富程度。

Thylakoid: A flattened membrane sac inside chloroplasts where light-dependent reactions of photosynthesis occur. Thylakoids are arranged in stacks called grana and contain chlorophyll and other pigments. AP questions frequently test the location of photosystems and the steep proton gradient generated across the thylakoid membrane during photophosphorylation.

类囊体：叶绿体内进行光合作用光反应的扁平膜囊。类囊体堆叠成基粒，含有叶绿素和其他色素。AP 考题常测试光系统的位置以及在光合磷酸化过程中类囊体膜两侧产生的陡峭质子梯度。

Lysosome: A membrane-enclosed organelle containing hydrolytic enzymes that break down proteins, nucleic acids, carbohydrates, and lipids. Lysosomes are involved in autophagy and programmed cell death. In the context of AP Biology, lysosomes are often linked to Tay-Sachs disease, a disorder caused by a defective lysosomal enzyme.

溶酶体：含有水解酶的膜包围细胞器，可分解蛋白质、核酸、碳水化合物和脂质。溶酶体参与自噬和程序性细胞死亡。在 AP 生物学中，溶酶体常与泰-萨克斯病（一种由溶酶体酶缺陷引起的疾病）相关联。

Rough Endoplasmic Reticulum (Rough ER): A network of membranes studded with ribosomes, where proteins are synthesized and modified. Proteins destined for secretion or membrane insertion are folded in the rough ER lumen and often glycosylated. Exam items frequently trace the path of a secretory protein from the rough ER through the Golgi to the plasma membrane.

糙面内质网：附着有核糖体的膜网络，是蛋白质合成和修饰的场所。准备分泌或插入膜中的蛋白质在糙面内质网腔中折叠，并经常进行糖基化。考题经常追踪分泌蛋白从糙面内质网经高尔基体到细胞膜的路径。

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4. Membrane Transport and Cell Communication | 膜运输与细胞通讯

Fluid Mosaic Model: The accepted model of the cell membrane, describing a flexible bilayer of phospholipids with embedded proteins, cholesterol, and carbohydrate chains. Proteins move laterally within the membrane, and the structure is dynamic. In AP tests, the model is used to explain selective permeability and the role of membrane components in signal transduction.

流动镶嵌模型：被广泛接受的细胞膜模型，描述了一种由磷脂构成的柔性双层，其中镶嵌有蛋白质、胆固醇和糖链。蛋白质在膜内可横向移动，结构高度动态。在 AP 考试中，该模型用于解释选择通透性以及膜组分在信号转导中的作用。

Facilitated Diffusion: Passive transport of molecules across a membrane via transmembrane proteins, either channel proteins or carrier proteins. No energy input is required; the driving force is the concentration gradient. Glucose uptake via GLUT transporters and ion movement through aquaporins are typical examples. Questions often ask students to distinguish between simple diffusion and facilitated diffusion using kinetic data.

协助扩散：通过跨膜蛋白（通道蛋白或载体蛋白）进行的分子被动运输。无需能量输入，驱动力来自浓度梯度。通过 GLUT 转运体摄入葡萄糖以及水孔蛋白的水分运输是典型例子。考题常要求学生利用动力学数据区分简单扩散与协助扩散。

Sodium-Potassium Pump (Na⁺/K⁺ ATPase): An active transport protein that uses ATP to move three sodium ions out of the cell and two potassium ions into the cell against their concentration gradients. This pump establishes the resting membrane potential and drives secondary active transport. The AP exam often includes calculations of ion concentrations after pump inhibition.

钠钾泵（Na⁺/K⁺ ATP酶）：一种主动转运蛋白，利用 ATP 逆浓度梯度将三个钠离子泵出细胞、两个钾离子泵入细胞。该泵建立静息膜电位并驱动次级主动运输。AP 考试常包含抑制钠钾泵后离子浓度的计算题。

Signal Transduction Pathway: A series of molecular events triggered by the binding of a signaling molecule (ligand) to a receptor, leading to a cellular response. Typical steps include reception, transduction (often involving phosphorylation cascades or second messengers like cAMP), and response. AP FRQs regularly require students to outline one specific pathway and predict the effect of a malfunctioning component.

信号转导通路：信号分子（配体）与受体结合后引发的一系列分子事件，最终导致细胞应答。典型步骤包括接收、转导（常涉及磷酸化级联反应或第二信使如 cAMP）和应答。AP 自由回答题经常要求考生描述一条具体通路并预测某一组分失灵的影响。

Ligand-Gated Ion Channel: A membrane receptor that opens or closes in response to the binding of a signaling molecule, allowing specific ions to flow across the membrane. For example, the acetylcholine receptor at the neuromuscular junction is a ligand-gated sodium channel. These channels are crucial for neurotransmission and are often contrasted with voltage-gated channels in AP questions.

配体门控离子通道：一种膜受体，与信号分子结合后开放或关闭，使特定离子跨膜流动。例如，神经肌肉接头处的乙酰胆碱受体是一种配体门控钠通道。这些通道对神经传递至关重要，在 AP 考题中常与电压门控通道进行比较。

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5. Cellular Respiration and Photosynthesis | 细胞呼吸与光合作用

Glycolysis: A metabolic pathway occurring in the cytoplasm that breaks one molecule of glucose (6C) into two molecules of pyruvate (3C), producing a net gain of 2 ATP via substrate-level phosphorylation and 2 NADH. Glycolysis does not require oxygen and is the first stage of both aerobic and anaerobic respiration. AP questions may ask about the inputs and outputs of glycolysis or its evolutionary significance.

糖酵解：在细胞质中进行的一条代谢途径，将一个葡萄糖分子（6C）分解为两个丙酮酸分子（3C），通过底物水平磷酸化净产生2个 ATP 和2个 NADH。糖酵解不需要氧气，是有氧呼吸和厌氧呼吸的第一阶段。AP 考题可能问到糖酵解的输入输出或其进化意义。

Krebs Cycle (Citric Acid Cycle): A cycle of reactions in the mitochondrial matrix that oxidizes acetyl-CoA to CO₂, producing 1 ATP, 3 NADH, and 1 FADH₂ per turn. The cycle also produces essential precursors for biosynthesis. On the exam, students are often required to track carbon atoms or calculate the energy yield after several turns of the cycle.

克雷布斯循环（柠檬酸循环）：在线粒体基质中进行的一个循环反应，将乙酰辅酶A氧化为 CO₂，每轮产生1个 ATP、3个 NADH 和1个 FADH₂。该循环还产生必需的前体用于生物合成。考试中常要求学生追踪碳原子或计算多轮循环后的能量产量。

Oxidative Phosphorylation: The process in which ATP is synthesized using the energy released by the electron transport chain. High-energy electrons from NADH and FADH₂ are passed through protein complexes, pumping H⁺ into the intermembrane space. The resulting proton gradient drives ATP synthase. AP tests frequently link defects in the electron transport chain to diseases and involve data analysis of oxygen consumption.

氧化磷酸化：利用电子传递链释放的能量合成 ATP 的过程。来自 NADH 和 FADH₂ 的高能电子经过蛋白复合体传递，将 H⁺ 泵入膜间隙。由此形成的质子梯度驱动 ATP 合酶。AP 考试常将电子传递链缺陷与疾病关联，并涉及耗氧量的数据分析。

Calvin Cycle: The light-independent reactions of photosynthesis that occur in the stroma of chloroplasts. Carbon dioxide is fixed by the enzyme rubisco, and through a series of reactions, G3P is produced using ATP and NADPH from the light reactions. The cycle must turn three times to produce one net G3P molecule. AP FRQs often require students to explain how changes in light intensity affect Calvin cycle intermediates.

卡尔文循环：发生在叶绿体基质中的光合作用暗反应。CO₂ 被 rubisco 酶固定，通过一系列反应利用光反应提供的 ATP 和 NADPH 生成 G3P。该循环需运转三次才净产生一分子 G3P。AP 自由回答题常要求学生解释光强变化如何影响卡尔文循环中间产物。

Rubisco: Ribulose-1,5-bisphosphate carboxylase/oxygenase, the enzyme that catalyzes the first step of carbon fixation in the Calvin cycle. Rubisco can also bind O₂ instead of CO₂, leading to photorespiration, which reduces photosynthetic efficiency. AP questions frequently address how C4 and CAM plants minimize photorespiration by spatially or temporally concentrating CO₂.

Rubisco（核酮糖-1,5-二磷酸羧化酶/加氧酶）：催化卡尔文循环中第一步碳固定的酶。Rubisco 也可结合 O₂ 而非 CO₂，导致光呼吸，降低光合效率。AP 问题常涉及 C4 和 CAM 植物如何通过空间或时间上富集 CO₂ 以最小化光呼吸。

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6. Cell Cycle and Cell Division | 细胞周期与细胞分裂

Cyclin-Dependent Kinase (CDK): A kinase that must bind to a specific cyclin to be active and regulate progression through the cell cycle. CDK-cyclin complexes phosphorylate target proteins that drive the cell past checkpoints. AP questions often depict graphs of cyclin concentration changes and ask students to predict the effects of nonfunctional CDKs.

周期蛋白依赖性激酶（CDK）：必须与特定周期蛋白结合后才具有活性，从而调控细胞周期进程的激酶。CDK-周期蛋白复合物磷酸化靶蛋白，推动细胞通过检查点。AP 题目常给出周期蛋白浓度变化图，并要求预测无功能 CDK 的影响。

Checkpoint: A critical control point in the cell cycle where stop signals halt progression until conditions are favorable. The G₁ checkpoint assesses cell size, DNA integrity, and growth signals; the G₂ checkpoint checks for DNA replication errors; the M checkpoint verifies spindle fiber attachment. Loss of checkpoint function is a hallmark of cancer, a topic heavily tested in AP Biology.

检查点：细胞周期中一个关键控制点，暂停信号会阻止进程直至条件适宜。G₁ 检查点评估细胞大小、DNA 完整性和生长信号；G₂ 检查点检查 DNA 复制错误；M 检查点确认纺锤丝附着

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