A-Level Biology (Edexcel IAL)

Course Overview 课程介绍

Edexcel IAL 生物采用模块化按 Unit 考试，可重考单模块，医学、生命科学与生物医学申请核心科目。

Edexcel International A-Level Biology is a modular course assessed unit by unit across five written units. Students sit each Unit exam separately and may retake individual units. Content spans molecules and genes, cells and biodiversity, energy and immunity, respiration and gene technology, with practical skills examined in Unit 3. A core subject for medicine, dentistry, veterinary science, biomedical sciences and biology.

Key Facts 基本信息

Exam Board (考试局)	Pearson Edexcel International A-Level
Specification Code (代码)	WBI11-15
Structure (结构)	Modular, 5 written units; AS = Units 1-3, A2 = Units 4-5
Grading (评分)	A* - E for full A-Level; a - e for AS
Exam Units (模块)	Modular structure, unit-by-unit assessment, single unit retake allowed
Practical (实验)	Unit 3 Practical Skills in Biology I (written practical paper)

AS Syllabus AS 阶段章节（Units 1-3）

Unit 1Molecules

Water, carbohydrates, lipids, proteins and nucleic acids (DNA and RNA), enzyme action
Unit 1Diet and Transport

Diet and digestion, absorption, the heart and blood vessels, blood, transport in plants (xylem and phloem)
Unit 1Genes

DNA replication, protein synthesis, genetics, inheritance, monohybrid and dihybrid crosses, mutations
Unit 2Cells and Development

Cell structure, membranes and transport, cell division (mitosis and meiosis), reproduction, growth, differentiation and stem cells
Unit 2Biodiversity and Conservation

Classification, biodiversity, measuring species diversity, conservation of ecosystems
Unit 3Practical Skills in Biology I

Experimental techniques, microscopy, data analysis, statistical tests and evaluation (written practical paper)

A2 Syllabus A2 阶段章节（Units 4-5）

Unit 4Energy and Environment

Photosynthesis, ecosystems, energy flow, nutrient cycles (carbon, nitrogen), human impact on the environment
Unit 4Microbiology and Immunity

Bacteria and viruses, microbes in biotechnology, the immune system, vaccination, infectious disease
Unit 5Respiration

Cellular respiration, ATP, glycolysis, Krebs cycle, electron transport chain, aerobic and anaerobic respiration
Unit 5Internal Environment and Coordination

Homeostasis, excretion and the kidney, nervous system, brain, receptors and muscle
Unit 5Gene Technology

Genetic engineering, recombinant DNA technology, biotechnology applications and ethical issues

Exam Structure (Edexcel IAL WBI11-15) 考试结构

Unit 1 (WBI11)	Molecules, Diet, Transport and Genes · 1h30m · 20% of IAL (40% of AS)
Unit 2 (WBI12)	Cells, Development, Biodiversity and Conservation · 1h30m · 20% of IAL (40% of AS)
Unit 3 (WBI13)	Practical Skills in Biology I · 1h20m · 10% of IAL (20% of AS)
Unit 4 (WBI14)	Energy, Environment, Microbiology and Immunity · 1h45m · 25% of IAL
Unit 5 (WBI15)	Respiration, Internal Environment, Coordination and Gene Technology · 1h45m · 25% of IAL
Modular Feature	Modular structure, unit-by-unit assessment, single unit retake allowed

Suitable Majors & Pathway 适合专业与升学路径

适合医学、生物医学、生命科学、药学与兽医专业，是英国医学与生命科学专业的重要必选科目。

Biology is essential for medicine, dentistry, veterinary science, biomedical sciences, biochemistry, pharmacy and biological sciences. Combined with Chemistry it forms the standard subject combination for medical school applications. The modular Edexcel IAL structure lets students retake individual units to strengthen their final grade before university deadlines.