Laboratory Exercise 8 Bacterial Morphology

Question 1

Microscopic discovery of microorganisms
1st acknowledged miroscopist and microbiologist

Answer 1

Anton van Leeuwenhoek

Question 2

Major Characteristics of Bacterial Cell

Answer 2

A. Size
B. Shape
C. Arrangement

Question 3

Major Characteristics of Bacterial Cell

The unit of measurement in bacteriology is the

Answer 3

micron or micrometer

also nanometer and Angstrom

Question 4

Major Characteristics of Bacterial Cell

B. Shape

Answer 4

1. Cocci - spherical
2. Bacilli - rod-shaped
3. Vibrios - curved or comma-shaped
4. Spirilla - rigid spiral or helical forms
5. Spirochetes - coil hair, flexuous spiral forms
6. Mycoplasma - cell wall deficient bacteria, present as round

Question 5

Major Characteristics of Bacterial Cell

C. Arrangement

Answer 5

1. Cocci - diplococci, streptococci (chains), staphylococci (grape like clusters), tetrads (2d square), cubical packets of 8 cells (3d cube, Sarcina)
2. Bacilli - coccobacillus, bacillus, diplobacilli, streptobacilli, palisades (Corynebacterium diphtheriae)
3. Others - spirilla, virios, spirochete

Question 6

Streptococcus faecalis
SA
PA
B. cereus
Corynebacterium pseudotuberculosis
Vibrio spp.
Neisseria spp.

Shape, Arrangement, Gram reaction, Color

Answer 6

Streptococcus faecalis - coccus, streptococcus (chains), Gram +, blue/purple
SA - coccus, staphylococcus (grape), Gram +, blue/purple
PA - bacillus, bacillus, Gram -, pink/red
B. cereus - bacillus, streptobacillus (chains), Gram + , blue/purple

Corynebacterium pseudotuberculosis - bacillus, streptobacillus, Gram +, blue/purple
Vibrio spp. - curved/comma, others (vibrio), Gram -, pink/red
Neisseria spp. - coccus, diplococci, Gram -, pink/red