PATHOLOGY

PATHOLOGY MCQ

IMMUNE RESPONSE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Archaebacteria that live in oxygen-free environments include
A
methanogens
B
retrovirus
C
bacteriophages
D
protists
Explanation: 

Detailed explanation-1: -Methanogens are examples of archaebacteria that live in oxygen-free environments. They are prokaryotes that produce methane as a by-product of metabolism, hence their name.

Detailed explanation-2: -Methanogens live in swamps and marshes, but can also be found in the gut of cattle, termites and other herbivores as well as in dead and decaying matter. Methanogens are anaerobic, so they don’t require oxygen.

Detailed explanation-3: -Methanogens are obligate anaerobic Archaea that produce energy from the biosynthesis of methane. These lithotrophic microorganisms are widely distributed in oxygen-free environments and participate actively in the carbon cycle.

Detailed explanation-4: -Methanogens belong to archaebacteria. They are strict anaerobes. They are autotrophs which obtain both energy and carbon from decomposition products. They occur in marshy areas where they convert formic acid and carbon dioxide into methane with the help of hydrogen.

Detailed explanation-5: -Abstract. Methanogenic archaea are a unique group of strictly anaerobic microorganisms characterized by their ability, and dependence, to convert simple C1 and C2 compounds to methane for growth. The major models for studying the biology of methanogens are members of the Methanococcus and Methanosarcina species.

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