EVERYDAY SCIENCE

Detailed explanation-1: -> Option A: Both blue-green algae or cyanobacteria and bacteria possess muramic acid and diaminopimelic acid in their cell wall. Muramic acid is an amino acid sugar. Muramic acid is the key component of peptidoglycan that forms the cell wall of both blue-green algae and bacteria.

Detailed explanation-2: -So, the correct option is ‘Muramic acid’.

Detailed explanation-3: -Muramic acid, a component of the muramyl peptide found only in the cell walls of bacteria and blue-green algae, furnishes a measure of detrital or sedimentary procaryotic biomass.

Detailed explanation-4: -Cell walls of cyanobacteria are composed of a peptidoglycan layer and an outer membrane.

Detailed explanation-5: -The cell wall of archaea is composed of S-layers and lack peptidoglycan molecules with the exception of methanobacteria who have pseudopeptidoglycan in their cell wall.