Which of the following best describes coccus bacteria?

Which of the following is a characteristic shape of coccus bacteria?

Which of the following statements is true about coccus bacteria?

Which of the following arrangements can coccus bacteria form?

The term coccus (plural: cocci) is used to describe prokaryotic cells that possess a round, spherical shape.

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Individual cells of a specific prokaryotic organism typically exhibit a characteristic shape, known as cell morphology. While thousands of prokaryotic organisms exist, only a handful of morphologies are commonly seen microscopically. These standard shapes include spherical (coccus), rod-shaped (bacillus), curved comma-shaped (vibrio), short oval-like rods (coccobacillus), long rigid corkscrews (spirillum), and loose, flexible helical spirals (spirochete).

Cell Morphologies

- Coccus
- Diplococcus
- Tetrad
- Streptococcus
- Staphylococcus 

Common Arrangements of Cocci

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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These bacterial cells lack a cell wall, thus they do not have a stable shape. They may appear as round bodies or interlacing filaments. 

Mycoplasmas

Pathogenic bacteria are bacteria that can cause infectious disease.

Pathogenic Bacteria

Which of the following bacterial morphologies is characterized by a spiral shape?

Which bacterial morphology is described as rod-shaped?

Which bacterial morphology is described as spherical in shape?

Which bacterial morphology is described as comma-shaped?

Coccus

The term bacillus (plural: bacilli) refers to prokaryotic cells that are rod-shaped, visually resembling long, rounded rectangles. Certain bacilli are also known for their ability to form endospores.

Bacillus

The term vibrio (plural: vibrios) is used to describe prokaryotic cells that are shaped like curved rods, closely resembling a long comma.

Vibrio

The term coccobacillus (plural: coccobacilli) refers to prokaryotic cells that appear as short rods, closely resembling ovals.

Coccobacillus

The term spirillum (plural: spirilla) describes prokaryotic cells that possess a long, spiral shape, visually resembling a corkscrew.

Spirillum

The term spirochete (plural: spirochetes) refers to prokaryotic cells that have a long, loose, and flexible helical spiral shape. They visually appear similar to spirilla but are noticeably more floppy. They are members of the Spirochaetota phylum.

Spirochete

The term diplococcus (plural: diplococci) refers to a cellular arrangement consisting of a pair of cocci, where two spherical cells are attached together.

Diplococcus

The term tetrad (plural: tetrads) describes a cellular arrangement consisting of a grouping of four cocci, or spherical cells, arranged in a square.

Tetrad

The term streptococcus (plural: streptococci) refers to a cellular arrangement where spherical cells, or cocci, are connected together to form a long chain.

Streptococcus

The term staphylococcus (plural: staphylococci) describes a cellular arrangement in which spherical cells, or cocci, are connected together into a bundle or cluster.

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