📚 Year 10 Cambridge Biology: Summer Preview and Bridging Course | Year 10 剑桥生物：暑期预习与衔接课程
Welcome to the Year 10 Cambridge Biology summer bridging course. This article is designed to help you preview the key topics you will encounter in your IGCSE Biology course. By studying these concepts over the summer, you will build a solid foundation and start the academic year with confidence. We cover the characteristics of life, cell biology, transport mechanisms, enzymes, plant and animal physiology, coordination, reproduction, and inheritance.
欢迎参加 Year 10 剑桥生物暑期衔接课程。本文旨在帮助你提前预习 IGCSE 生物课程中的核心主题。通过暑期学习这些概念，你将打下扎实基础，自信开启新学年。我们涵盖生命特征、细胞生物学、物质运输机制、酶、植物与动物生理、协调作用、生殖和遗传等内容。
1. Characteristics of Living Organisms | 生物的共同特征
All living organisms share seven life processes, often remembered by the acronym MRS GREN: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition. Movement can be locomotion or internal movement. Respiration is the chemical release of energy from food. Sensitivity means detecting and responding to changes in the environment. Growth is a permanent increase in size. Reproduction is producing offspring. Excretion is removal of metabolic waste. Nutrition is obtaining food for energy and materials.
所有生物都具有七项生命过程，常用首字母缩写 MRS GREN 记忆：运动、呼吸作用、感受性、生长、生殖、排泄和营养。运动可以是移位或内部运动。呼吸作用是从食物中释放能量的化学反应。感受性指探测并响应环境变化。生长是体积的永久性增大。生殖是产生后代。排泄是清除代谢废物。营养是获取食物以提供能量和物质。
For example, plants exhibit movement when leaves turn towards light (phototropism), and animals run or contract muscles. Respiration occurs in every living cell, releasing ATP. Sensitivity is shown when an amoeba moves away from a chemical. Growth in trees adds annual rings. Excretion includes the elimination of carbon dioxide from the lungs. Nutrition in green plants involves photosynthesis.
例如，植物叶片向光转动（向光性）表现出运动，动物奔跑或肌肉收缩。每个活细胞都进行呼吸作用，释放 ATP。变形虫远离化学物质表现出感受性。树木生长产生年轮。排泄包括肺排出二氧化碳。绿色植物的营养包括光合作用。
2. Cell Structure and Function | 细胞结构与功能
Cells are the basic structural and functional units of life. The main organelles include the nucleus, which contains genetic material; the cytoplasm, where many metabolic reactions occur; the cell membrane, which controls passage of substances; mitochondria, where aerobic respiration takes place; and ribosomes, which synthesise proteins. Plant cells additionally have a rigid cell wall made of cellulose, a large permanent vacuole, and chloroplasts for photosynthesis.
细胞是生命的基本结构和功能单位。主要细胞器包括：细胞核，含有遗传物质；细胞质，许多代谢反应在此发生；细胞膜，控制物质进出；线粒体，进行有氧呼吸；核糖体，合成蛋白质。植物细胞还有纤维素构成的坚韧细胞壁、中央大液泡以及进行光合作用的叶绿体。
y skills involve calculating magnification and size using the formula: magnification = image size ÷ actual size. Staining with iodine or methylene blue can highlight specific structures.
记住动植物细胞之间的差异至关重要。动物细胞没有细胞壁、叶绿体和大液泡。显微镜技能包括使用公式计算放大倍数和大小：放大倍数 = 图像大小 ÷ 实际大小。用碘液或亚甲基蓝染色可以突出特定结构。
magnification = image size ÷ actual size
3. Movement of Substances into and out of Cells | 物质进出细胞
Substances move across cell membranes by diffusion, osmosis, and active transport. Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration, down a concentration gradient. It is a passive process that does not require energy. Oxygen and carbon dioxide diffuse across membranes during gas exchange.
物质通过扩散、渗透和主动运输跨细胞膜移动。扩散是粒子从高浓度区域向低浓度区域的净移动，顺浓度梯度。这是被动过程，不需要能量。在气体交换中，氧气和二氧化碳通过扩散跨膜。
Osmosis is the diffusion of water molecules through a partially permeable membrane from a dilute solution to a more concentrated solution. It occurs down the water potential gradient. Plant cells become turgid when placed in pure water and plasmolysed in strong sugar solution. Animal cells may burst (lysis) in dilute solution and shrink in concentrated solution.
渗透是水分子通过半透膜从稀溶液向浓溶液的扩散。它顺着水势梯度进行。植物细胞在纯水中变得硬胀，在浓糖溶液中发生质壁分离。动物细胞在稀溶液中可能胀破（溶血），在浓溶液中皱缩。
Active transport requires energy from ATP to move ions or molecules against the concentration gradient, using carrier proteins. Examples include uptake of mineral ions by root hairs and reabsorption of glucose in kidney tubules.
主动运输需要来自 ATP 的能量，通过载体蛋白逆浓度梯度移动离子或分子。例子包括根毛吸收矿质离子和肾小管对葡萄糖的重吸收。
4. Biological Molecules and Enzymes | 生物分子与酶
Key biological molecules include carbohydrates (sugars and starch), lipids (fats and oils), and proteins. They are made up of smaller units: carbohydrates from simple sugars like glucose, proteins from amino acids, and lipids from fatty acids and glycerol. Food tests: Benedict's test for reducing sugars, iodine solution for starch, Biuret test for proteins, and ethanol emulsion test for lipids.
关键的生物分子包括碳水化合物（糖和淀粉）、脂类（脂肪和油）和蛋白质。它们由较小单元组成：碳水化合物来自葡萄糖等单糖，蛋白质来自氨基酸，脂类来自脂肪酸和甘油
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