SHS2 Biology · Semester 1 Week 13: Cell Structure and Functions

Lesson notes

Learning Objectives

Indicator: 2.2.2.LI.1 - Describe in detail the Watson-Crick Model of the DNA and state the significance of the model in a eukaryotic cell.

By the end of the lesson, learners can:

Draw and label the Watson-Crick Model of the DNA molecule, identifying the sugar-phosphate backbone, nitrogenous bases, and hydrogen bonds.
State the base-pairing rule (Adenine pairs with Thymine, Guanine pairs with Cytosine) and explain why complementary base pairing is essential to the DNA structure.
Describe the three key features of the Watson-Crick Model: the double helix, antiparallel strands, and complementary base pairing.
Explain the significance of the Watson-Crick Model in a eukaryotic cell, including its role in storing genetic information and providing a template for replication.
Construct a physical or drawn model of DNA and use it to explain how the structure supports its function in the cell.

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Curriculum details

Strand: Life in the Fundamental Unit (Strand 2)
Sub-strand: Cell Structure and Functions (2.2)
Content standard: 2.2.2.CS.2 - Demonstrate knowledge and understanding of the molecular structure of nucleic acids and their importance in the synthesis of protein in living things. 2.2.2.LO.2 Explain the Watson-Crick model of Nucleic acids (the DNA), and their roles in synthesising proteins for building the body of living things.
Indicator: 2.2.2.LI.1 - Describe in detail the Watson-Crick Model of the DNA and state the significance of the model in a eukaryotic cell.
Suggested placement: Semester 1, Week 13 (Week 13 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 70

Exemplars (from the NaCCA curriculum)

Project-Based Learning: watch videos and charts on nucleic acids and DNA and draw the Watson- Crick Model of the DNA.
Collaborative Learning: in mixed-ability groups, discuss the Model in detail, and examine its significance in a eukaryotic cell
Teaching and Learning Materials:
- * LCD/TV * Pen drive
- * Models of DNA. * Models of eukaryotic cells
- * Mobile phone
Assessment (2.2.1.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning; Level 4 Extended critical thinking and reasoning.