Which of the statements regarding gram staining is wrong?
Option 1:
Streptococcus pyogenes stains blue because of a thick peptidoglycan
layer
Option
2:
Mycoplasma pneumoniae is not visible in the Gram's stain because it
has no cell wall
Option 3:
Mycobacterium tuberculosis stains blue because of the thick lipid
layer
Option 4:
Escherichia coli stains pink because of a thin peptidoglycan layer
Answers
Answer:
Option 3
Explanation:
Mycobacterium tuberculosis can't be visible with Gram staining because it has techoic acid in its cell wall which make it resistant from Gram staining. Acid Fast staining is used for their staining.
Answer:
Mycobacterium tuberculosis stains blue because of the thick lipid layer is wrong.
Explanation:
Mycobacterium tuberculosis is a human pathogen that has had a staggering global impact. Its origin is ancient. Spinal deformities, usually caused by Mycobacterium tuberculosis, have been found in human remains dating back to at least 5000 BC as far away as Peru and Egypt [1]. Although the emergence of Mycobacterium tuberculosis as a human pathogen is not well understood, the domestication of cattle facilitated close contact with humans and eventually led to the evolution of Mycobacterium bovis, a strain of Mycobacterium bovis for transmission. Tuberculosis (TB) did not become endemic among humans until the early 17th century, when Western Europe became urbanized and airborne bacteria spread efficiently from person to person. The plague, often called the "Great White Plague," swept across much of Western Europe from England.
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