AP Biology High-Frequency Vocabulary from Past Exams | AP生物：真题高频词汇汇编

📚 AP Biology High-Frequency Vocabulary from Past Exams | AP生物：真题高频词汇汇编

Mastering the high-frequency vocabulary from AP Biology exams is essential for achieving a top score. This compilation organizes key terms by topic, providing clear, exam-focused explanations to help you recognize core concepts in multiple-choice questions and effectively apply them in free-response answers. Each term is explained in English and Chinese to reinforce understanding and bilingual retention.

掌握AP生物考试中的高频词汇对取得高分至关重要。这份汇编按专题整理了关键术语，提供清晰、紧扣考点的解释，帮助你在选择题中识别核心概念，并在简答题中有效应用。每个术语均用英文和中文解释，以强化理解和双语记忆。

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1. Cell Structure and Function | 细胞结构与功能

The cell membrane, or plasma membrane, is a selectively permeable phospholipid bilayer with embedded proteins, cholesterol, and carbohydrate chains. The fluid mosaic model describes its dynamic nature. It controls the movement of substances such as ions, water, and glucose via passive or active transport. AP questions often test the role of cholesterol in maintaining membrane fluidity under temperature changes, or the function of aquaporins in facilitated diffusion of water.

细胞膜（质膜）是半透性的磷脂双分子层，镶嵌有蛋白质、胆固醇和糖链。流动镶嵌模型描述了其动态特性。它通过被动或主动运输控制离子、水和葡萄糖等物质的进出。AP常考胆固醇在温度变化下维持膜流动性的作用，或水通道蛋白在水的协助扩散中的功能。

Mitochondria are the sites of aerobic respiration. They have a double membrane; the inner membrane is folded into cristae, which increase surface area for the electron transport chain and ATP synthase. The matrix contains enzymes for the Krebs cycle. Mitochondria also possess their own DNA and ribosomes, supporting the endosymbiotic theory. In AP, you are frequently asked to relate mitochondrial structure to chemiosmotic ATP production.

线粒体是有氧呼吸的场所。它拥有双层膜；内膜折叠成嵴，增加了电子传递链和ATP合酶的表面积。基质含有三羧酸循环的酶。线粒体还拥有自己的DNA和核糖体，支持内共生理论。AP常要求你将线粒体结构与化学渗透产ATP联系起来。

Chloroplasts, found in plants and algae, conduct photosynthesis. They contain thylakoid membranes organized into grana, where the light-dependent reactions capture solar energy to produce ATP and NADPH. The stroma hosts the Calvin cycle, which fixes carbon dioxide into sugars. Like mitochondria, chloroplasts have their own DNA and double membranes, evidence for endosymbiotic origin. AP exams often ask you to trace energy and electron flow through photosystems and to compare chloroplast and mitochondrial chemiosmosis.

叶绿体存在于植物和藻类中，进行光合作用。它包含类囊体膜，堆叠成基粒，光依赖反应在此捕获光能生成ATP和NADPH。叶绿体基质是卡尔文循环的场所，将二氧化碳固定为糖类。与线粒体一样，叶绿体拥有自身DNA和双层膜，是内共生起源的证据。AP经常要求追踪光系统中的能量和电子流，并比较叶绿体与线粒体的化学渗透。

Ribosomes are molecular machines that synthesize proteins by translating mRNA. They consist of large and small subunits made of rRNA and proteins. Free ribosomes in the cytoplasm produce proteins that function within the cytosol, while bound ribosomes on the rough endoplasmic reticulum manufacture secretory and membrane proteins. The AP curriculum expects you to connect ribosome structure and location to the destination of the polypeptide.

核糖体是翻译mRNA合成蛋白质的分子机器。它由rRNA和蛋白质组成的大亚基和小亚基构成。细胞质中游离核糖体合成在胞质溶胶内起作用的蛋白质，而粗糙内质网上的附着核糖体则制造分泌蛋白和膜蛋白。AP课程要求你将核糖体的结构和位置与多肽的去向联系起来。

The Golgi apparatus is a stack of flattened membrane sacs that modifies, sorts, and packages proteins and lipids from the endoplasmic reticulum for transport to various destinations. It adds molecular tags, such as adding phosphate groups or glycosylation. Vesicles bud off the Golgi and can fuse with the plasma membrane for secretion. AP questions may require you to predict the pathway of a newly synthesized protein through the endomembrane system.

高尔基体是一叠扁平膜囊，对来自内质网的蛋白质和脂质进行修饰、分拣和包装，并运送到不同目的地。它添加分子标签，如磷酸基团或糖基化。小泡从高尔基体出芽，可与质膜融合进行分泌。AP可能要求你预测新合成蛋白质在内膜系统中的走向。

Lysosomes are membrane-bound organelles filled with hydrolytic enzymes that digest macromolecules, worn-out organelles, and engulfed pathogens. They maintain an acidic interior optimal for their enzymes. Autophagy and phagocytosis often converge at the lysosome. AP frequently tests the role of lysosomes in recycling cellular components and in programmed cell death (apoptosis).

溶酶体是充满水解酶的膜包被细胞器，可消化大分子、老损细胞器和被吞噬的病原体。它们保持内部酸性环境以利于酶活。自噬和吞噬作用常交汇于溶酶体。AP常考察溶酶体在回收细胞组分以及程序性细胞死亡（凋亡）中的作用。

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2. Cell Communication and Signaling | 细胞通讯与信号转导

A ligand is a signaling molecule that binds to a specific receptor protein to initiate a cellular response. Ligands can be hydrophilic (e.g., peptide hormones, neurotransmitters) and bind cell-surface receptors, or hydrophobic (e.g., steroid hormones) and pass through the membrane to bind intracellular receptors. AP questions often ask you to contrast the signal pathways of water-soluble and lipid-soluble signals.

配体是一种信号分子，能与特定受体蛋白结合以启动细胞应答。亲水性配体（如肽类激素、神经递质）与细胞表面受体结合，而疏水性配体（如类固醇激素）可穿过膜与胞内受体结合。AP常要求对比水溶性和脂溶性信号的转导途径。

G-protein coupled receptors (GPCRs) are a large family of cell-surface receptors that, upon ligand binding, activate a G protein, which in turn triggers a cascade of intracellular events, often involving second messengers such as cAMP or Ca²⁺. This signal amplification allows a single ligand molecule to produce a large cellular effect. Be prepared to explain how ligand binding changes receptor conformation and activates adenylyl cyclase, leading to cAMP production.

G蛋白偶联受体（GPCR）是一大类细胞表面受体，配体结合后激活G蛋白，进而引发包含第二信使如cAMP或Ca²⁺在内的胞内级联反应。这种信号放大使单个配体分子能产生巨大的细胞效应。要准备好解释配体结合如何改变受体构象并激活腺苷酸环化酶，导致cAMP生成。

A phosphorylation cascade is a series of protein kinases, each phosphorylating the next, ultimately activating a transcription factor or other effector. This is a common feature of signal transduction pathways. Tyrosine kinase receptors (RTKs) dimerize upon ligand binding and autophosphorylate, initiating a phosphorylation cascade. The AP exam often asks you to diagram a signaling pathway and predict the consequences of a dysfunctional component.

磷酸化级联反应是一系列蛋白激酶依次磷酸化下一个蛋白，最终激活转录因子或其他效应器。这是许多信号转导通路的共同特征。酪氨酸激酶受体（RTK）在配体结合后二聚化并自磷酸化，启动磷酸化级联。AP考试常要求你绘制信号通路图并预测某一组分功能失常的后果。

Apoptosis, or programmed cell death, is a tightly regulated process that eliminates damaged or unnecessary cells without causing inflammation. It is mediated by caspases, proteases that cleave intracellular targets. Apoptosis plays critical roles in development, such as digit formation, and in immune defense. Questions may link apoptosis to intracellular signaling pathways and to cancer when apoptosis fails.

凋亡，即程序性细胞死亡，是一种严密调控的过程，能清除受损或不必要的细胞而不引发炎症。它由半胱氨酸蛋白酶（caspase）介导，后者切割胞内靶蛋白。凋亡在发育（如手指形成）和免疫防御中起关键作用。考题可能将凋亡与胞内信号通路相联系，并联系到凋亡失效导致的癌症。

Cell junctions allow communication and adhesion between animal or plant cells. Gap junctions (animal) and plasmodesmata (plant) create cytoplasmic channels for the passage of ions and small molecules. Tight junctions prevent leakage between cells, while desmosomes provide mechanical anchoring. You should be able to distinguish these structures and their roles in tissue integrity and intercellular signaling.

细胞连接使动物或植物细胞间实现通讯与粘附。间隙连接（动物）和胞间连丝（植物）形成胞质通道，允许离子和小分子通过。紧密连接防止细胞间渗漏，桥粒提供机械锚定。你应能区分这些结构及其在组织完整性和细胞间信号传导中的作用。

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3. Cellular Energetics | 细胞能量学

Enzymes are biological catalysts, mostly proteins, that lower activation energy without being consumed. Each enzyme has an active site where the substrate binds, often described by the induced fit model. Key exam topics include how changes in temperature, pH, and substrate concentration affect reaction rate, and how competitive inhibitors (bind active site) differ from noncompetitive inhibitors (bind allosteric site). Competitive inhibition can be overcome by increasing substrate concentration, while noncompetitive inhibition reduces the maximum reaction velocity (Vmax).

酶是生物催化剂，大多是蛋白质，能降低活化能而不被消耗。每个酶有一个活性位点，底物与之结合，常以诱导契合模型描述。重点考点包括温度、pH和底物浓度如何影响反应速率，以及竞争性抑制剂（结合活性位点）与非竞争性抑制剂（结合变构位点）的区别。竞争性抑制可通过增加底物浓度克服，而非竞争性抑制则降低最大反应速度（Vmax）。

ATP (adenosine triphosphate) is the main energy currency of the cell. Its hydrolysis to ADP and inorganic phosphate (Pi) releases free energy that can drive endergonic reactions through coupled reactions or energy coupling. The ATP cycle illustrates energy transfer: catabolic pathways generate ATP, and anabolic pathways consume it. AP often asks you to calculate the energy released from ATP hydrolysis or to explain how ATP regeneration links to electron transport.

ATP（三磷酸腺苷）是细胞的主要能量货币。它水解为ADP和无机磷酸（Pi）并释放自由能，可通过偶联反应或能量偶联驱动吸能反应。ATP循环展示了能量转移：分解代谢途径生成ATP，合成代谢途径消耗它。AP常要求你计算ATP水解释能或解释ATP再生如何与电子传递相联系。

Cellular respiration includes glycolysis, pyruvate oxidation, the Krebs cycle, and oxidative phosphorylation. Glycolysis occurs in the cytoplasm and yields a net of 2 ATP and 2 NADH per glucose. Pyruvate oxidation and the Krebs cycle occur in the mitochondrial matrix and produce NADH and FADH₂, which donate electrons to the electron transport chain. The final stage uses chemiosmosis to produce approximately 26-28 ATP. You are expected to trace the carbon atoms from glucose and the electron carriers.

细胞呼吸包括糖酵解、丙酮酸氧化、三羧酸循环和氧化磷酸化。糖酵解在细胞质中发生，每个葡萄糖净产2 ATP和2 NADH。丙酮酸氧化和三羧酸循环在线粒体基质中进行，生成NADH和FADH₂，为电子传递链提供电子。最后阶段通过化学渗透产生约26-28个ATP。你应追踪来自葡萄糖的碳原子和电子载体。

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (ATP)

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 能量（ATP）

Photosynthesis converts light energy into chemical energy in two stages: the light-dependent reactions and the Calvin cycle. Light reactions in the thylakoid membranes split water, produce O₂, and generate ATP and NADPH. The Calvin cycle in the stroma uses ATP and NADPH to fix CO₂ into G3P, a precursor to glucose. AP questions frequently link the two stages through the carriers and require you to identify the reactants and products of each step, such as photolysis as the source of O₂.

光合作用分两个阶段将光能转化为化学能：光依赖反应和卡尔文循环。类囊体膜上的光反应裂解水、产生O₂、生成ATP和NADPH。基质中的卡尔文循环利用ATP和NADPH将CO₂固定为G3P，后者是葡萄糖的前体。AP常通过载体将两个阶段联系起来，并要求你辨别每步的反应物和产物，例如光解是O₂的来源。

6CO₂ + 6H₂O + Light energy → C₆H₁₂O₆ + 6O₂

6CO₂ + 6H₂O + 光能 → C₆H₁₂O₆ + 6O₂

Chemiosmosis is the process in which an electrochemical proton (H⁺) gradient across a membrane drives ATP synthesis via ATP synthase. In both mitochondria and chloroplasts, energy from electron transport pumps protons into a compartment (intermembrane space of mitochondria, thylakoid lumen of chloroplasts), and the flow of protons back through ATP synthase provides energy for phosphorylation of ADP. Comparisons between these two organelles are classic AP free-response items.

化学渗透是指跨膜的电化学质子（H⁺）梯度通过ATP合酶驱动ATP合成。在线粒体和叶绿体中，电子传递释放的能量将质子泵入间隔（线粒体的膜间隙、叶绿体的类囊体腔），质子回流通过ATP合酶提供能量使ADP磷酸化。比较这两种细胞器是经典的AP简答题素材。

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4. Cell Cycle and Division | 细胞周期与分裂

The cell cycle consists of interphase (G1, S, G2) and mitotic phase. During interphase, the cell grows and replicates its DNA in the S phase. Mitosis distributes identical chromosomes to two daughter nuclei. AP highlights the checkpoints (G1, G2, M) controlled by cyclins and cyclin-dependent kinases (CDKs). Disruption in checkpoint regulation can lead to cancer. Be ready to interpret graphs showing fluctuating cyclin concentrations across the cycle.

细胞周期由间期（G1期、S期、G2期）和有丝分裂期组成。间期细胞生长并在S期复制DNA。有丝分裂将相同染色体分配到两个子核。AP强调周期蛋白和周期蛋白依赖性激酶（CDK）控制的检查点（G1、G2、M）。检查点调控的破坏可导致癌症。要准备好解读显示周期蛋白浓度波动的曲线图。

Mitosis includes prophase, metaphase, anaphase, and telophase, followed by cytokinesis. In prophase, chromosomes condense; in

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