12 Questions
Which group of mycobacteria grows slowly, does not produce pigment, forms smooth colonies, and is resistant to isoniazid?
Group 3
What is the habitat for Mycobacterium bovis and Mycobacterium tuberculosis?
Soil and water
Which species of mycobacteria has been implicated in epizootics of bovine mastitis?
Mycobacterium fortuitum
Which term is derived from the small granulomatous nodules seen in advanced infections by M.tuberculosis or M.bovis?
Tuberculosis
Which subgroup of mycobacteria are classified as rapid growers and mature in less than one week at specified temperatures?
M. fortuitum subgroup
What type of parasites are M.avium, M.bovis, and M.fortuitum classified as?
Facultative intracellular parasites
What is the main reason for the slow growth and resistance of mycobacteria?
Their high lipid content in the cell wall
Which of the following is a component of the lipid in mycobacteria?
Trehalose 6,6' dimycolate (cord factor)
Which group of mycobacteria produce a yellow pigment only when exposed to light?
Group 1 (photochromogenic strains)
Which of the following mycobacteria can cause pulmonary disease in humans?
M. kansasii
What is the main characteristic of the scotochromogenic group of mycobacteria?
They grow slowly and produce a yellow pigment in light or dark
What is the characteristic shape of mycobacteria?
Curved or straight rods
Learn about the high lipid content of cell walls in mycobacteria, which contributes to their hydrophobicity, slow growth, and resistance to various substances. Explore the composition of waxes and glycolipids, including the presence of high-molecular-weight mycolic acids such as trehalose 6,6' dimycolate ('cord factor').
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