Cork-screw shaped bacteria are known as

Cocci
Bacilli
Spirilla
None of the above

The correct answer is C. Spirilla.

Bacteria are classified into three main shapes: cocci, bacilli, and spirilla. Cocci are round or spherical bacteria, bacilli are rod-shaped bacteria, and spirilla are spiral-shaped bacteria.

Spirilla are long, thin bacteria that are often corkscrew-shaped. They are typically motile, meaning that they can move around on their own. Spirilla are found in a variety of environments, including soil, water, and the human body. Some species of spirilla are beneficial, while others can cause disease.

For example, the bacterium Helicobacter pylori, which is spiral-shaped, is a common cause of stomach ulcers. However, there are also beneficial spiral-shaped bacteria, such as those that live in the human gut and help to digest food.

Bacteria are important organisms that play a vital role in the environment. They are also important for human health, as they are used to produce antibiotics and other medications.

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