SCIENCE
VIRUS AND BACTERIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Archaea and bacteria have different membrane lipids.
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Both archaea and bacteria generally lack membrane-enclosed organelles.
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The cell walls of archaea lack peptidoglycan.
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Only some archaea use CO2 to oxidize H2, releasing methane.
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Detailed explanation-1: -(D) Only some archaea use CO2 to oxidize H2, releasing methane. (A) The statement “Archaea and bacteria have different membrane lipids” is true. (B) The statement “the cell walls of archaea lack peptidoglycan” is true. (C) The statement “only bacteria have histones associated with DNA” is not true.
Detailed explanation-2: -Bacteria/Eukarya produce membrane lipids with hydrophobic fatty acid tails that are ester-bound to glycerol-3-phosphate (G3P), whereas Archaea synthesize membrane lipids with hydrophobic isoprenoid lipid tails that are ether-linked to glycerol-1-phosphate (G1P) with the opposite chirality.
Detailed explanation-3: -Bacteria and Archaea differ in the lipid composition of their cell membranes and the characteristics of the cell wall. In archaeal membranes, phytanyl units, rather than fatty acids, are linked to glycerol. Some archaeal membranes are lipid monolayers instead of bilayers.
Detailed explanation-4: -Archaea and bacteria have different membrane lipids. Both archaea and bacteria generally lack membrane-enclosed organelles. The cell walls of archaea lack peptidoglycan. Only bacteria have histones associated with DNA.
Detailed explanation-5: -Bacteria and Archaea are differentiated on the basis of their cell wall composition, cell membrane composition, and type of flagella present.