Multiple Choice
Which of the following is a common site of infection by Staphylococcus aureus?
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1. Introduction to Microbiology
Introduction to Bacteria
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Which bacterial genus is characterized by having waxy mycolic acid in its cell walls?
A
Streptococcus
B
Escherichia
C
Bacillus
D
Mycobacterium
Verified step by step guidance1
Understand that bacterial cell wall composition is a key characteristic used to differentiate bacterial genera.
Recall that mycolic acids are long-chain fatty acids found in the cell walls of certain bacteria, giving them a waxy texture and making them acid-fast.
Identify that the genus Mycobacterium is well-known for having mycolic acid in its cell walls, which contributes to its unique staining properties and resistance to certain chemicals.
Compare the other options: Streptococcus (Gram-positive cocci without mycolic acid), Escherichia (Gram-negative rods without mycolic acid), and Bacillus (Gram-positive rods without mycolic acid).
Conclude that the presence of waxy mycolic acid in the cell wall is a defining feature of the genus Mycobacterium.
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