Which of the following is a spiral-shaped bacteria?

Explanation

Mainly, bacteria have three shapes: spherical, rod-shaped, and spiral. 1. Spherical: A coccus is a spherical bacteria. Examples of cocci are Streptococcus pneumonia, Neisseria meningitides. 2. Rod-shaped: Bacilli are straight or rod-shaped organisms. When curved into a form resembling a comma, they are known as vibrio, and when present as a stack of coins, they are known as a palisade. Examples of rod-shaped bacteria are Escherichia coli, Pseudomonas. 3. Spiral: Spirochetes are spiral bacteria that usually occur singly or in colonies. An example is Treponema pallidum.