| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Biology |
| Lesson Topic: describe the formation of a glycosidic bond by condensation, with reference to disaccharides, including sucrose, and polysaccharides |
Learning Objective/s:
- Describe the condensation mechanism that forms a glycosidic bond between monosaccharides.
- Identify the α‑ and β‑configurations of glycosidic bonds in common disaccharides, especially sucrose.
- Compare the structures and properties of polysaccharides based on their glycosidic linkages.
- Predict the products of a condensation reaction for a given set of monosaccharides.
|
Materials Needed:
- Projector or interactive whiteboard
- Slide deck with diagrams of glycosidic bonds
- Handouts of disaccharide and polysaccharide tables
- Molecular model kits (ball‑and‑stick)
- Worksheets for practice reactions
- Exit‑ticket cards
|
Introduction:
Begin with a quick visual of a candy bar and ask students what holds the sugar molecules together. Review that carbohydrates are built from monosaccharides and that condensation reactions remove water. Explain that by the end of the lesson they will be able to describe how a glycosidic bond forms and why its orientation matters.
|
Lesson Structure:
- Do‑now (5'): Students list examples of carbohydrates they ate yesterday; teacher collects responses.
- Mini‑lecture (10'): Explain the condensation reaction, show the general equation, and illustrate α/β orientation with slides.
- Guided practice (10'): Use molecular models to build sucrose, identifying the anomeric carbons involved.
- Group activity (12'): Given monosaccharide pairs, students draw the resulting disaccharide, label the bond type, and share answers.
- Polysaccharide extension (8'): Discuss polymerisation; students complete a comparison chart for starch, glycogen, and cellulose.
- Check for understanding (5'): Quick quiz via Kahoot or exit‑ticket with two questions on glycosidic bond formation.
|
Conclusion:
Summarise that glycosidic bonds are dehydration links whose orientation determines the properties of sugars and polymers. Ask students to write one key difference between α‑linked storage polysaccharides and β‑linked structural polysaccharides as an exit ticket. For homework, assign a short worksheet to draw the condensation reaction for maltose and explain why sucrose is non‑reducing.
|