Bacterial Shapes and Arrangements Flashcards

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Questions and Answers

Which of the following are the 3 basic bacterial shapes?

  • Bacillus (correct)
  • Spiral (correct)
  • Coccus (correct)
  • Oval

What unit is used to measure bacterial size?

micrometer

What does coccus mean?

spherical, circles

Which of the following are arrangements of cocci? (Select all that apply)

<p>Staphylococcus (A), Tetrad (B), Diplococci (C), Streptococcus (D)</p> Signup and view all the answers

What is the pattern of streptococci?

<p>chainlike pattern of spherical bacteria</p> Signup and view all the answers

What is the arrangement of staphylococci?

<p>grapelike clusters of broad sheets of spherical bacteria</p> Signup and view all the answers

What does diplococci refer to?

<p>pairs of spherical bacteria</p> Signup and view all the answers

What are tetrads in bacterial arrangements?

<p>groups of four spherical bacteria</p> Signup and view all the answers

What shape is bacillus?

<p>rod-shaped</p> Signup and view all the answers

What are the arrangements of bacillus? (Select all that apply)

<p>Coccobacilli (A), Streptobacilli (B)</p> Signup and view all the answers

What describes streptobacilli?

<p>chains of rod-shaped bacteria</p> Signup and view all the answers

What are coccobacilli?

<p>short, plump oval looking, partly rod-shaped but also spherical</p> Signup and view all the answers

What does spiral bacteria look like?

<p>cylinder, twisty, never straight</p> Signup and view all the answers

Which of the following are arrangements of spiral bacteria? (Select all that apply)

<p>Vibrio (A), Spirillum (B), Spirochete (D)</p> Signup and view all the answers

What describes vibrio bacteria?

<p>type of spiral bacteria; curved or bent rods</p> Signup and view all the answers

What distinguishes spirilla?

<p>type of spiral bacteria; helical shape; like a corkscrew</p> Signup and view all the answers

What is a spirochete?

<p>type of spiral bacteria; helical and flexible</p> Signup and view all the answers

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Study Notes

Basic Bacterial Shapes

  • Bacteria have three fundamental shapes: coccus (spherical), bacillus (rod-shaped), and spiral (twisted).

Measurement of Size

  • Bacterial size is commonly measured in micrometers (µm).

Cocci (Plural: Cocci)

  • Cocci are spherical bacteria, resembling circles in shape.

Arrangements of Cocci

  • Cocci can arrange in various formations, including:
    • Streptococcus: chainlike clusters.
    • Staphylococcus: grapelike clusters or broad sheets.
    • Diplococci: pairs of cocci.
    • Tetrads: groups of four cocci.

Bacillus

  • Bacillus bacteria are characterized by their rod-like shape.

Arrangements of Bacillus

  • Bacillus can form specific arrangements such as:
    • Streptobacilli: chains of rod-shaped bacteria.
    • Coccobacilli: short and plump; oval in shape, exhibiting characteristics of both rods and spheres.

Spiral Bacteria

  • Spiral bacteria are cylindrical and twisted, never appearing straight.

Arrangements of Spiral Bacteria

  • Spiral bacteria include:
    • Vibrio: curved or bent rods.
    • Spirilla: helical shape, resembling corkscrews; they have rigid bodies and move with flagella.
    • Spirochete: helical and flexible; they move using axial filaments tucked inside a flexible external sheath.

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