**This Powerpoint specifically uses the Cambridge AS Level Biology Syllabus and covers all criteria for – Unit 1.1 The microscope in cell studies
**
Students will be able to -

1 describe the structure of a chromosome, limited to:
• DNA
• histone proteins
• sister chromatids
• centromere
• telomeres

2 explain the importance of mitosis in the production of
genetically identical daughter cells during:
• growth of multicellular organisms
• replacement of damaged or dead cells
• repair of tissues by cell replacement
• asexual reproduction

3 outline the mitotic cell cycle, including:
• interphase (growth in G1 and G2 phases and DNA
replication in S phase)
• mitosis
• cytokinesis

4 outline the role of telomeres in preventing the loss of genes
from the ends of chromosomes during DNA replication

5 outline the role of stem cells in cell replacement and tissue
repair by mitosis

6 explain how uncontrolled cell division can result in the
formation of a tumour

**Every Powerpoint includes learning objectives, a starter and plenary, suitable activities and review questions with mark scheme. We also provide a FREE pdf version of the file so it can easily be printed for students as a handout or uploaded to the school VLE system
**

Bring your Cambridge AS Level Biology lessons to life with our expertly designed teaching resources. Each unit is tailored to the latest syllabus, offering ready-to-use lesson plans, engaging experiments, and visually clear notes that save hours of prep time. Whether you’re new to the course or refining your approach, The Science Shelf gives you everything you need to boost student understanding and exam success — all in one place.