Exercise 7: Wet Mount

Question 1

Wet mount

Answer 1

a quick and easy way to see the size and shape of a microbe using a phase contrast microscope

Question 2

Brownian movement

Answer 2

when water molecules bombard the cells and shake them giving the impression of locomotion

Question 3

Positive chemotaxis

Answer 3

when bacteria move TOWARDS a positive stimulus (e.g. nutrients)

Question 4

Negative chemotaxis

Answer 4

when bacteria move AWAY from a negative stimulus (e.g. toxins)

Question 5

Controls

Answer 5

• Positive (motile): Proteus vulgaris

- Negative (nonmotile): Staphylococcus epidermidis