Which of the following is NOT a basic type of bacteria?

The correct response identifies that "Helicoid" is not a basic type of bacteria. In microbiology, the common morphological shapes of bacteria are classified into three major categories: bacilli, cocci, and spirilla.

Bacilli are rod-shaped bacteria, which can be found in chains or singly. Cocci refer to spherical-shaped bacteria, which can also appear in various arrangements, such as clusters or pairs. Spirilla, on the other hand, are spiral or corkscrew-shaped bacteria, known for their distinctive form.

While "Helicoid" may refer to a helical or spiral form, it is not a standard classification used in bacteriology to describe bacterial shapes. Therefore, it does not fit within the recognized basic categories of bacterial morphology. This distinction illustrates the importance of understanding standard terminology in the field of microbiology, particularly when studying different types of microorganisms relevant to skin care and esthetic practices.