Week 2

Question 1

What is Serial Dilution?

Answer 1

A Stepwise dilution of a substance in solution

Question 2

What are the two main methods used to know how many bacteria are present?

Answer 2

1. Hemocytometer- Direct Count
2. Dilution- Indirect count

Question 3

what is the concentration cell count equation?

Answer 3

Cells/ml = ______total#cells________________
[(total # of 0.04mm2 boxes counted) x (4*10-6ml) x (dilution)]

Question 4

Coccus

Answer 4

Single Coccus ( one circle )

Question 5

Diplococcus

Answer 5

pair of two cocci ( two circles )

Question 6

Tetrad

Answer 6

Group of 4 cells in arranged in a square

Question 7

Streptococcus

Answer 7

Chain of Cocci

Question 8

Staphylococcus

Answer 8

Cluster of cocci

Question 9

Bacillus

Answer 9

Single Rod

Question 10

Streptobacillus

Answer 10

Chain of rods

Question 11

Is Staphylococcus Gram - or +

Answer 11

it is Gram +, arranged in irregular cluster

Question 12

Is E. Coli Gram - or +

Answer 12

it is Gram -, Bacillus