📚 Eduqas GCSE Biology Unit 1 Mock Exam Analysis: Cells, Transport & Health | Eduqas GCSE 生物单元一模拟卷解析：细胞、运输与健康
Mock exams are a crucial part of Year 11 revision, helping you identify gaps and refine exam technique. This walkthrough analyses ten typical questions from an Eduqas GCSE Biology Component 1 paper covering cells, transport systems and health.
模拟考试是11年级复习的关键环节，能帮助你发现知识漏洞并完善答题技巧。本文深入解析一份Eduqas GCSE生物单元一模拟卷中的十道典型题目，涵盖细胞、运输系统和健康主题。
1. Microscopy and Magnification | 显微镜与放大倍数
The Question: has an eyepiece lens of ×10 and an objective lens of ×40. What is the total magnification? (1 mark)
题目：一台显微镜的目镜放大倍数为×10，物镜放大倍数为×40。总放大倍数是多少？(1分)
. Total magnification = eyepiece magnification × objective magnification = 10 × 40 = ×400.
许多学生匆忙作答，将两个数值相加，但放大倍数是相乘的。总放大倍数 = 目镜放大倍数 × 物镜放大倍数 = 10 × 40 = ×400。
Exam tip: Always check whether the question asks for total magnification or the magnification of a single lens. If an image size is given, you may need to use the formula:
考试技巧：务必审清题目要求的是总放大倍数还是单个镜头的倍数。如果给出了图像尺寸，可能需要用到公式：
Magnification = Image size ÷ Actual size
放大倍数 = 图像大小 ÷ 实际大小
Remember to convert all measurements to the same unit (usually mm or µm) before calculating.
计算前记得将所有测量单位统一（通常为 mm 或 µm）。
2. Enzyme Activity and pH | 酶活性与pH值
The Question: Pepsin is a protease enzyme that works in the stomach. Explain why its activity is highest at pH 2 and why it loses activity at pH 8. (3 marks)
题目：胃蛋白酶是一种在胃中起作用的蛋白酶。解释为何它在 pH 2 时活性最高，而在 pH 8 时失活。(3分)
Enzymes have a specific optimum pH at which their active site has the best shape to bind to the substrate. For pepsin, this is pH 2, matching the acidic environment of the stomach. At pH 8, the active site denatures: the bonds holding the 3D shape break, so the substrate no longer fits.
酶具有特定的最适 pH，在该 pH 下其活性位点的形状最适合与底物结合。胃蛋白酶的最适 pH 为 2，与胃的酸性环境匹配。在 pH 8 时，活性位点变性：维持三维结构的化学键断裂，底物不再契合。
Common mistake: students say the enzyme dies. Enzymes are not alive; they are denatured, not killed.
常见错误：学生说酶“死亡”。酶并非生物，只能说它变性，而不能说被杀死。
3. Osmosis and Water Potential | 渗透作用与水分势
The Question: A piece of onion epidermis is placed in concentrated sugar solution. Describe and explain what happens to the cells. (4 marks)
题目：将洋葱表皮置于浓糖溶液中。描述并解释细胞会发生什么变化。(4分)
Water moves from a region of higher water potential (inside the cell) to a lower water potential (concentrated sugar solution) through a partially permeable membrane. The vacuole shrinks, and the cell membrane pulls away from the cell wall – this is called plasmolysis. The cell becomes flaccid.
水分从水分势较高的区域（细胞内）通过部分透性膜移动到水分势较低的浓糖溶液中。液泡缩小，细胞膜从细胞壁分离，这一过程称为质壁分离。细胞变得松弛。
Key terminology: always use 'water potential' and 'partially permeable membrane' for full marks. Avoid 'sucks out water'.
关键术语：务必使用“水分势”和“部分透性膜”以获取满分。避免使用“把水吸出来”等不专业的表述。
4. The Digestive System | 消化系统
The Question: Label parts A to D on a diagram of the human digestive system, and state the function of part C (stomach). (4 marks)
题目：在人体消化系统示意图中标出 A 到 D 部分，并说明 C 部分（胃）的功能。(4分)
Typical labels: A – salivary glands, B – oesophagus, C – stomach, D – pancreas. The stomach churns food, produces hydrochloric acid to kill bacteria, and secretes protease (pepsin) to break down proteins into amino acids.
常见标注：A – 唾液腺，B – 食道，C – 胃，D – 胰腺。胃的功能是搅拌食物、产生盐酸杀死细菌，并分泌蛋白酶（胃蛋白酶）将蛋白质分解为氨基酸。
Students often confuse the roles of pepsin and amylase. Pepsin works in the stomach; amylase works in the mouth and small intestine.
学生常混淆胃蛋白酶和淀粉酶的作用。胃蛋白酶在胃中工作，淀粉酶在口腔和小肠中工作。
5. Circulatory System Structure | 循环系统结构
The Question: Identify the chambers of the heart labelled X and Y on a diagram, and explain why the left ventricle has a thicker wall than the right ventricle. (3 marks)
题目：在心脏示意图中指出标注 X 和 Y 的腔室，并解释为什么左心室壁比右心室壁厚。(3分)
X is the right atrium, Y is the left ventricle. The left ventricle pumps blood to the whole body, requiring higher pressure to overcome the resistance of systemic circulation. The right ventricle only pumps blood to the nearby lungs.
X 为右心房，Y 为左心室。左心室将血液泵送到全身，需要较高的压力克服体循环的阻力。右心室只需将血液泵送到近处的肺部。
Remember: The heart is labelled as if it were in your own chest – left and right are reversed on the diagram.
记住：心脏标记的方式犹如它在你自己胸腔内——在示意图中左右是反转的。
6. Non-Specific Defences | 非特异性防御
Published by TutorHao | Year 11 Biology Revision Series | aleveler.com
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