2.1.2 Slides and Photomicrographs

Question 1

What is an example of a stain?

Answer 1

Methylene Blue

Question 2

What are differential stains?

Answer 2

Stains that will only stain specific structures

Question 3

Name some differential stains and what they stain

Answer 3

• Sundan red (lipids)
• Iodine/ Blue/black (starch)
• Acetic orecin/ Dark red (DNA/chromosomes)
• Eosin (Cytoplasm)
• Iodine/ Yellow (Cellulose in plant cell walls)

Question 4

What is Paramecium?

Answer 4

• A colourless/transparent organism
• Light interference not light absorption - adjust its diaphragm
• Can see a clear image without staining