Carbohydrates are polymers of monosaccharides (a) Name the polysaccharide that p
ID: 507873 • Letter: C
Question
Carbohydrates are polymers of monosaccharides (a) Name the polysaccharide that provides strength and rigidity to bacterial cell walls. (b) Name the monosaccharide unit (s) that polymerize to makes up the polysaccharide in (a). (c) What is the glycosidic linkage of the backbone polymer in (c)? (d) (i) Starch and Glycogen function as ___ polysaccharides. (ii) Polysaccharides such as ___ and ___ serve as structural molecules. (iii) Cell surface polysaccharides such as ___ and ___ have a roles as ___ molecules. (iv) ___are polysaccharides that provide strength and rigidity. (a) What is the structure of D- glucose - open form (Fisher projection)? (b) What is the structure of D- glucose - closed form (Haworth projection)?Explanation / Answer
Ans 3 a. bacterial cell walls are made up of peptidoglycan or murein which provide them strength and rigidity. Gram negative bacteria lack cell walls.
b. The sugar component of peptidoglycan wall is made up of alternating structures of beta 1,4 linked N acetylglucosamine and N- acetyl muramicacid.
c. 1-4 glycosidic linkage is present in backbone polymer of bacterial cell walls
d. i)starch and glycogen serve as a storage polysaccharides
ii) polysachharides such as cellulose and chitin serve as as structural molecules
iii) cell surface polysaccharides such as lipopolysaccharide and exopolysaccharide have a role as biofilm molecule
iv) peptidoglycan are polysaccharides that provide strength and rigidity