SCIENCE
VIRUS AND BACTERIA
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Archaebacteria were discovered in the 1970s.
|
|
|
Archaebacteria live in almost all habitats on Earth.
|
|
|
Archaebacteria have tRNA similar to eukaryotes.
|
|
|
Archaebacteria do not have peptidoglycan in their cell walls.
|
Detailed explanation-1: -Archaebacteria are the prokaryotic organisms. These organisms contain the cell membrane which is made up of the amino acids and glycolipids which are linked by an ether linkage. There is no peptidoglycan as in the bacterial cell wall. They are prokaryotes which do not have membrane-bound organelles.
Detailed explanation-2: -They lack the peptidoglycan found in almost all prokaryotes and instead, in methanogens, contain a pseudomurein layer, which is similar to the peptidoglycan structure. In general, archaeal structures have been studied in less detail than the corresponding bacterial structures.
Detailed explanation-3: -Archaea lack peptidoglycan, but they still form rigid cell boundaries that confer resistance to high internal osmotic pressure. To do this, they elaborate protein or glycoprotein coats or reinforce their cytoplasmic membranes. The S-layer glycoproteins are the best characterized glycoproteins of Archaea.
Detailed explanation-4: -Thus, the correct answer is ‘They have some novel features absent in other prokaryotes and eukaryotes.
Detailed explanation-5: -Their cell wall lacks peptidoglycan.