CAIE Year 11 Biology: Key Concepts Review | CAIE Year 11 生物：核心知识点梳理

📚 CAIE Year 11 Biology: Key Concepts Review | CAIE Year 11 生物：核心知识点梳理

As you progress through Year 11 of the CAIE IGCSE Biology course (0610), consolidating the core concepts is essential for success in your examinations. This article provides a concise review of the fundamental topics, linking structure to function and process, helping you build a strong foundation for the extended response questions. Each section summarises key points that are frequently assessed, ensuring you are well-prepared.

当你学习CAIE IGCSE生物（0610）课程Year 11阶段时，巩固核心知识点对考试取得成功至关重要。本文简明扼要地梳理了基础主题，将结构与功能、过程联系起来，帮助你为拓展题目打下坚实基础。每节总结了经常考查的关键点，确保你充分准备。

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

All living organisms are composed of cells, which are the basic units of life. The development of microscopes allowed scientists to observe cells and distinguish between prokaryotic and eukaryotic organisms. You must be familiar with describing and comparing animal and plant cells seen under a light microscope.

所有生物体都由细胞组成，细胞是生命的基本单位。显微镜的发展使科学家能够观察细胞，并区分原核生物与真核生物。你必须能够描述和比较在光学显微镜下观察到的动物细胞和植物细胞。

Typical animal cells contain a nucleus, cytoplasm, cell membrane, mitochondria and ribosomes. The nucleus controls cell activities and houses genetic material. Mitochondria are the site of aerobic respiration, releasing energy. Ribosomes synthesise proteins.

典型的动物细胞含有细胞核、细胞质、细胞膜、线粒体和核糖体。细胞核控制细胞活动并储存遗传物质。线粒体是有氧呼吸的部位，释放能量。核糖体合成蛋白质。

Plant cells have a rigid cell wall made of cellulose, chloroplasts for photosynthesis, and a large permanent vacuole containing cell sap. These structures enable plants to carry out photosynthesis, maintain turgor and provide structural support.

植物细胞有坚硬的细胞壁（由纤维素构成）、进行光合作用的叶绿体以及含有细胞液的大液泡。这些结构使植物能够进行光合作用、维持渗透压并提供结构支撑。

2. Movement in and out of Cells | 物质进出细胞

Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration down a concentration gradient, as a result of their random motion. It is a passive process and does not require energy. Examples include gas exchange in the lungs and absorption of digested food.

扩散是指粒子由于随机运动，从较高浓度区域净移动到较低浓度区域，顺浓度梯度进行。这是一种被动过程，不需要能量。例如肺部气体交换和消化后食物的吸收。

Osmosis is the diffusion of water molecules through a partially permeable membrane from a region of higher water potential to a region of lower water potential. In plant cells, osmosis causes turgidity when water enters and plasmolysis when water leaves.

渗透是水分子通过半透膜从水势较高区域扩散到水势较低区域的过程。在植物细胞中，水分进入导致膨胀，而水分流失则导致质壁分离。

Active transport is the movement of molecules or ions against a concentration gradient, requiring energy from respiration. Carrier proteins in the cell membrane pump substances across. This is essential for the uptake of mineral ions by root hairs and reabsorption of glucose in kidney tubules.

主动运输是分子或离子逆浓度梯度的运动，需要呼吸作用提供的能量。细胞膜上的载体蛋白泵送物质通过。这对于根毛吸收矿质离子和肾小管重吸收葡萄糖至关重要。

3. Biological Molecules and Enzymes | 生物分子与酶

Carbohydrates, proteins, and lipids are the main organic molecules. Starch and glycogen are storage polysaccharides; cellulose provides structural support in cell walls. Proteins are made of amino acids and have diverse roles, including enzymes. Lipids (fats and oils) are energy stores and insulators.

碳水化合物、蛋白质和脂质是主要的有机分子。淀粉和糖原是储存性多糖；纤维素构成细胞壁的结构支持。蛋白质由氨基酸组成，具有多种功能，包括酶。脂质（脂肪和油）是能量储存和绝缘体。

Enzymes are biological catalysts that speed up metabolic reactions without being used up. Each enzyme has an active site specific to its substrate, explained by the lock-and-key model. Factors affecting enzyme activity include temperature, pH, and substrate concentration.

酶是生物催化剂，能加速代谢反应而自身不被消耗。每种酶的活性位点与底物特异性结合，可用锁钥模型解释。影响酶活性的因素包括温度

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