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Cell Wall Lipids in Mycobacteria

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Questions and Answers

Which group of mycobacteria grows slowly, does not produce pigment, forms smooth colonies, and is resistant to isoniazid?

Group 1

Group 2

Group 4

Group 3 (correct)

What is the habitat for Mycobacterium bovis and Mycobacterium tuberculosis?

Forests

Marine environments

Air

Soil and water (correct)

Which species of mycobacteria has been implicated in epizootics of bovine mastitis?

Mycobacterium fortuitum (correct)

Mycobacterium avium

Mycobacterium leprae

Mycobacterium tuberculosis

Which term is derived from the small granulomatous nodules seen in advanced infections by M.tuberculosis or M.bovis?

Tuberculosis Signup and view all the answers

Which subgroup of mycobacteria are classified as rapid growers and mature in less than one week at specified temperatures?

M. fortuitum subgroup Signup and view all the answers

What type of parasites are M.avium, M.bovis, and M.fortuitum classified as?

Facultative intracellular parasites Signup and view all the answers

What is the main reason for the slow growth and resistance of mycobacteria?

Their high lipid content in the cell wall Signup and view all the answers

Which of the following is a component of the lipid in mycobacteria?

Trehalose 6,6' dimycolate (cord factor) Signup and view all the answers

Which group of mycobacteria produce a yellow pigment only when exposed to light?

Group 1 (photochromogenic strains) Signup and view all the answers

Which of the following mycobacteria can cause pulmonary disease in humans?

M. kansasii Signup and view all the answers

What is the main characteristic of the scotochromogenic group of mycobacteria?

They grow slowly and produce a yellow pigment in light or dark Signup and view all the answers

What is the characteristic shape of mycobacteria?

Curved or straight rods Signup and view all the answers