Question

Comma Shaped Bacteria are-
a. Bacilli
b. Spirilla
c. Vibrios
d. Cocci

Answer 1

Hint: Bacteria are classified into 5 different groups based on their basic shapes:
- Spherical (cocci),
- Rod (bacilli),
- Spiral (Spirilla),
- Comma (Vibrios) or
- Corkscrew (spirochaetes).
They can exist as single cells, in pairs, chains or even in clusters.

Complete answer:
> Option A. Bacilli
Bacteria with a rod-shaped structure are known as Bacilli. Bacillus bacteria have the key traits such as-
- All are rod-shaped
- Form endospores
- Facultative anaerobes
Similarly as cocci bacteria, bacillus bacteria also are arranged differently. While some of them exist as single, unattached cells for instance Salmonella enterica subsp, Bacillus cereus, and Salmonella choleraesuis others are attached.

> Option B. Spirilla
Spiral shaped bacteria are called Spirilla. Similarly as Spirochetes, Spirilla bacteria also possess a helical shape. However, they are more rigid as well as have a typical flagella found in other types of bacteria. Some examples of bacteria are-
- Aquaspirillum
- Campylobacter jejuni
- Spirillum winogradskyi
- Oceanospirillum

> Option C. Vibrio
Bacteria having a comma-like single curve structure are known as Vibrio. Normally vibrio bacteria have a comma-shaped body but they do not fully twist structures like curved rods. Some of the Examples of Vibrio bacteria are
- Vibrio mytili
- Vibrio anguillarum
- Vibrio parahaemolyticus
- Vibrio cholerae

> Option D. Cocci
Cocci bacteria are present in spherical or oval shape. For the most part, their structure is determined by the cell wall of the organism as well as they vary from one type of cocci bacteria to another. They may exist as single cells or remain attached to each other.

Hence, the correct answer is option (C).

Note: Vibrio bacteria is a genus of Gram-negative bacteria, several species of this bacteria can cause foodborne infection to humans, normally associated with eating under-cooked seafood.