Question
Biology Question on biological classification
Peptidoglycan is a characteristic constituent of the cell wall of
A
bacteria and unicellular eukaryotes
B
bacteria and cyanobacteria
C
archaebacteria and all eukaryotes
D
all members of Monera and Protista.
Answer
bacteria and cyanobacteria
Explanation
Solution
Peptidoglycan is a macromolecule that is a component of the cell wall of bacteria and cyanobacteria. Peptidoglycan is made up of mucopolysaccharide and polypeptides. N-acetyl glucosamine and N-acetyl muramic acid (amino sugars) are linked to a tripeptide of alanine, glutamic acid and lysine or diaminopimelic acid. It gives strength and shape to the cell wall.