Year 10 - Science
The structure of DNA: including nucleotides
Cell division: mitosis and meiosis
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers mitosis and the cell cycle in growth, cancer as uncontrolled cell division, and the role of mutations in genetic variation. It explains meiosis in gamete formation and chromosome reduction. The emphasis is on recording observations and interpreting patterns to draw conclusions.
Lesson Summary
You will learn to describe the structure of DNA and how DNA is copied during mitosis.
Key Notes
- DNA is made of two strands, each a long polymer of nucleotides, wound together in a double helix shape.
- DNA is a polymer of four different nucleotides (A, C, G and T).
- Nucleotides in each strand of DNA pair up in a complementary way; A pairs with T, and C pairs with G.
- The DNA in chromosomes is unwound & copied during interphase, then the copies separate and the cell divides by mitosis.
- Complementary base pairing allows an exact copy of each 'unzipped' DNA strand to be made from free nucleotides.
Vocabulary To Learn
- DNA: A polymer with a double helix structure that carries the genetic information.
- mitosis: A type of cell division that produces genetically identical cells.
- nucleotides: Individual subunits that make up DNA.
- polymer: A long chain of repeating subunits.
- complementary base pairing: Bases form pairs with one other base: A pairs with T, and C pairs with G.
Common Mistakes To Avoid
- Students may think that each strand of DNA is the same without recognising one strand is inverted.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
DNA is made of two strands, each a long polymer of nucleotides, wound together in a double helix shape. DNA is a polymer of four different nucleotides (A, C, G and T).
2. Define this scientific word and use it in context. 'DNA'
A polymer with a double helix structure that carries the genetic information. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Students may think that each strand of DNA is the same without recognising one strand is inverted. Correction: The slides specifically mention the second strand is inverted and this is also reinforced using diagrams of inverted nucleotides wherever possible.
More Lessons In This Unit
- Errors in cell division and cancer: basics Study Guide
- Errors in cell division and cancer: beyond the basics Study Guide
- Growth in multicellular organisms Study Guide
- Making gametes: meiosis Study Guide
- Observing mitosis in plant cells using a light microscope Study Guide
- Observing mitosis in plant cells using a light microscope (including PMAT) Study Guide
- The cell cycle and cell division: mitosis Study Guide
- The cell cycle and cell division: mitosis (including PMAT) Study Guide
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