Cells (MICROPARA Lab)

Spherical-shaped bacteria

Rod-shaped bacteria

What are the 3 basic shapes of bacteria?

• Bacillus

• Staphylococci

• Spiral

• Coccus

Cocci that remain in pairs after dividing are called

Cocci that divide in two planes and remain in groups of four are known as

Cocci that divide in three planes and remain attached in cubelike groups of eight are called

Cocci that divide in multiple planes and form grapelike clusters or broad sheets are called

What is the difference between the term bacillus and Bacillus?

• 'bacillus' refers to all bacteria; 'Bacillus' is a type of virus.
• 'bacillus' is a genus; 'Bacillus' is a species within it.
• 'bacillus' is a general term for rod-shaped bacteria; 'Bacillus' is a specific genus of bacteria.

• 'bacillus' is used for spherical bacteria; 'Bacillus' is for spiral bacteria.

Why don’t bacilli form tetrads or clusters?

• Bacilli do not form tetrads or clusters because they divide along a single axis, resulting in linear arrangements.
• Bacilli form clusters due to their spherical shape.
• Bacilli are always found in pairs, which leads to tetrads.
• Bacilli divide in multiple directions, creating clusters.

Bacilli that appear as single rods are called