Texas State Manicurist Written Practice Exam

What is a characteristic shape of spirilla bacteria?

1. Round

2. Short

3. Spiral

4. Curved

The correct answer is: Spiral

The characteristic shape of spirilla bacteria is spiral. This unique shape distinguishes spirilla from other types of bacteria, as they are elongated, twisted, and appear like a corkscrew. Their spiral design allows for increased mobility in liquid environments due to the flexible structure, enabling them to navigate through various substances more efficiently than other bacterial shapes. In contrast, round bacteria are referred to as cocci, and those that are short are usually described as bacilli. Curved bacteria may refer to vibrio bacteria, but this is not the same as the distinct spiral form exhibited by spirilla. Understanding these shapes is essential in microbiology for identifying and classifying bacteria, as well as understanding their behavior in different environments.