📚 GCSE OCR Science: High-Frequency Topics Summary | GCSE OCR 科学：高频考点总结
The OCR GCSE Science specification (Combined or Separate) regularly tests a core set of principles across Biology, Chemistry and Physics. Mastering these high-frequency topics will give you a solid foundation and help you tackle the majority of exam questions confidently.
OCR GCSE科学考试大纲（综合或分科）在生物、化学和物理中反复考查一组核心原理。掌握这些高频主题将为你的复习打下坚实基础，帮助你自信应对大部分考题。
1. Cell Biology | 细胞生物学
Eukaryotic cells (plant and animal) contain membrane-bound organelles. The nucleus stores genetic material, mitochondria perform aerobic respiration, ribosomes synthesise proteins, and the cell membrane controls passage of substances. Plant cells additionally have a cell wall made of cellulose, chloroplasts for photosynthesis, and a large permanent vacuole for support and storage.
真核细胞（动植物）含有膜结合的细胞器。细胞核储存遗传物质，线粒体进行有氧呼吸，核糖体合成蛋白质，细胞膜控制物质进出。植物细胞还有由纤维素组成的细胞壁、用于光合作用的叶绿体以及用于支持和储存的大液泡。
Magnification calculations are essential. Use the triangle: Magnification = Image size ÷ Actual size. Always convert measurements to the same unit (1 mm = 1000 µm). If the image size is 50 mm and actual size is 0.5 mm, magnification = 50 ÷ 0.5 =
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