Starter

• On paper to hand in (names on)

What is the difference between resolution and magnification?

Learning objectives

• Recall maximum magnification and resolution of a light, transmission electron and scanning electron microscope

• Explain how these microscopes work

• Identify advantages and disadvantages of each type of microscope

Extraction of information

• Using1. The very old AS textbook2. The 3 biological review articles

Complete a table of the following informationT:\Science\1.NEW T DRIVE\Key stage 5\Biology\2008 Spec\AS\F211 Cells, Exchange and Transport\1.1 Cell structure\5.1.1 lesson2blank summary

table.doc

How did you do?

• T:\Science\1.NEW T DRIVE\Key stage 5\Biology\2008 Spec\AS\F211 Cells, Exchange and Transport\1.1 Cell structure\5.1.1 lesson2 summary table.doc

• Why did I get you to extract the information yourself and not just give you it?

Current values from Heinemann

Type Max resolution Max magnification

Light 200nm X1500

Transmission electron

0.1nm X500,000

Scanning electron

0.1nm X100,000

How do you get colour electron micrographs?

• Computer software has been used to colour the separate parts of the image

Plenary

On the sheet given allocate light, transmission, and scanning to each statement

Statements are advantages of each

Hand in name on

Answers

1. Light2. SEM + TEM3. SEM4. Light5. SEM + TEM6. SEM + TEM7. SEM + TEM8. SEM + TEM

Homework

Complete allocated questions on the exam question pack

Hand in Wed to Mrs Rochelle

Revision of all work for test next Wed in Mrs Rochelle’s lesson