Multiple Choice
In a thioglycollate broth test tube, where would you expect to find the growth of a microaerophilic bacterium?
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1. Introduction to Microbiology
Introduction to Bacteria
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Which term is used to describe short, rod-shaped bacteria?
A
Streptococci
B
Spirochetes
C
Vibrios
D
Coccobacilli
Verified step by step guidance1
Understand the shapes of bacteria: Bacteria are commonly classified by their shapes, such as cocci (spherical), bacilli (rod-shaped), spirilla (spiral-shaped), and others.
Identify the term for rod-shaped bacteria: 'Bacilli' refers to bacteria that are rod-shaped, which are longer and cylindrical.
Recognize the term for short, rod-shaped bacteria: When the rods are very short and somewhat oval, they are called 'coccobacilli' because they have characteristics between cocci (spherical) and bacilli (rod-shaped).
Review the options given: Streptococci are chains of spherical bacteria, spirochetes are spiral-shaped bacteria, vibrios are comma-shaped curved rods, and coccobacilli are short rods.
Conclude that the term 'coccobacilli' correctly describes short, rod-shaped bacteria, combining features of both cocci and bacilli.
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