Morphology of Bacteria- Microbiology notes|ICDS Supervisor Kerala PSC

by Author on Wednesday, September 04, 2019 in ICDS Supervisor Exam, Microbiology

Morphology of Bacteria- Microbiology notes|ICDS Supervisor Kerala PSC

Morphology of Bacteria- Microbiology

Morphology of Bacteria

Size:

Bacteria come in a great many sizes and several shapes.
Most bacteria range from 0.2 to 2.0 μm in diameter and from 2 to 8 μm in length. (an overall average size of 1 to 10 μm.)

Shape:

They have a few basic shapes:

1. Spherical coccus (plural: cocci, meaning round),

2. Rod-shaped bacillus (plural: bacilli)

3. Spiral.

Cocci:

Cocci are usually round but can be oval or elongated.

When they divide to reproduce, they remain attached to each other.

Classification According to Plane of Division:

Diplococci:

Those Cocci that remain in pairs after dividing are called diplococci.

Streptococci:

Those cocci that divide and remain attached in chainlike patterns are called streptococci.

Tetrad:

Those cocci that divide into two planes and remain in groups of four are known as tetrads.

Sarcinae:

Those cocci that divide in three planes and remain attached in cube like groups of eight are called sarcina.

Staphylococci:

Those cocci that divide in multiple planes and form grape like clusters or broad sheets are called staphylococci.

Bacilli:

Bacillus are the rod like bacteria

e.g. Bacillus anthracis

Single bacillus:

Most bacilli appear as single rods, called single bacilli.

Diplobacilli:

Those bacilli which are appear in pairs after division called Diplobacilli

Streptobacilli:

Those bacilli that found in chains in single plane are called Streptobacilli.

Monomorphic:

Bacteria that maintain single shape called monomorphic or the bacteria having same shape.

Pleomorphic:

Some bacteria can have many shapes known as pleomorphic.

e.g: Corynebacterium, Pyogenesis.

-Some bacteria occur in the shape of star e.g. Stella.

- Some bacteria occur in the shape of rectangle e.g. Haloarcula.

- Some bacteria also appear triangular in shape.

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