Which of the following statements is true about Bacillus bacteria?

What characteristic allows Bacillus bacteria to survive in harsh environmental conditions?

Which of the following best describes the shape and survival mechanism of Bacillus bacteria?

Which of the following is a defining feature of Bacillus bacteria?

Bacterial cells that are rod shaped are bacilli. Bacilli are capable of forming endospores. 

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Bacteria can be classified based on their different morphologies.
- Coccus
- Bacillus
- Vibrio
- Coccobacillus
- Spirillum
- Spirochete

Cell Morphologies

- Bacillus
- Diplobacillus
- Streptobacillus
- Palisade

Common Arrangements of Bacilli

Low G+C gram positive bacteria have less than 50% cytosines and guanines their genomes. This group of bacteria also contains many pathogens. They consist of many different bacteria: 
- Clostridia
- Lactobacillales
- Bacilli
- Mycoplasmas 

Low G+C gram positive bacteria

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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

Coccus bacteria are round and spherical in shape.

Coccus

Bacillus

These bacterial cells are curved rod shaped. 

Vibrio

Coccobacilli bacteria are short rod shaped bacteria. 

Coccobacillus

Spirilla are rigidly spiraled shaped bacterial cells.

Spirillum

Spirochete cells are longer and helical spiral bacterial cells. They are members of the Spirochaetota phylum of bacteria.

Spirochete

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?

Diplobacillus is a pair of bacillus rod cells. 

Diplobacillus

Streptobacillus

Palisade is a group of bacilli arranged side-by-side or a V formation.

Palisade

Clostridia are endospore producing bacteria that can live in soil and sediment which can let them lie dormant for years. 

Clostridia

Lactobacillales is a low G+C gram positive bacteria that have bacilli and cocci bacteria: 
- *Lactobacillus*
- *Leuconostoc*
- *Enterococcus*
- *Streptococcus*

Lactobacillales 

Mycoplasmas are gram positive bacteria even though they lack a cell wall. They were identified by being gram positive because of their low G+C content genome. 

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