The cell membranes of archaeons that lack a cell wall are strengthened by diglycerol tetraethers; option D.
Cell membrane refers to the outer covering found in living cells which help to separate the internal contents of the cell such as the cell organelles and cytoplasm from the external environment of the cell.
Cell membranes are composed of lipid bilayers where the lipids consists of a hydrophobic tail found in the interior and a hydrophilic haed found ar the exterior.
Cell membrane in bacteria and archaeons consists of a peptidoglycan cell wall which strengthens and protects the cell.
In archaeons that lack a cell wall, the cell membrane is strengthened by diglycerol tetraethers.
In conclusion, cell membranes are the outer covering of cells.
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The complete question is given below:
The cell membranes of wall-less archaeons are strengthened by
A. diglycerol ethers.
B. glycoprotein or protein layers.
C. pseudomurein.
D. diglycerol tetraethers.