Question

Chapter 7 - Carbohydrates (20 points) 1. (15 points) Answer each part of the following question regarding a polysaccharide that consists of the following repetitive toisaccharide unit. A. (10 points) Draw a Haworth projection for one unit of the repetitive trisaccharide described. i. It is a trimer composed of N-acetyl-D-glucosamine (1"position) and D-fructose (2nd position) and L-mannose (3rd position). ii. The linkage between N-acetyl-D-glucosamine and D-fructose is a 1+4). iii. The linkage between D-fructose and L-mannose is Fru(a2B1) Man B. (1 point) Circle all anomeric carbons C. (1 point) Label all glycosidic bonds with arrows (be specific). D. (1 point) Is this a homopolysaccharide or heteropolysaccharide? Explain,

Answer 1

Q.1.Answer-

A) structure of trimer composed of N-acetyl-D- glucosamine, D-fructose and L-mannose is-

Red coloured circle in structure represents anomeric carbon.

D) it is heteropolysaccharide because it is composed of more than one type of monosaccharide and after hydrolysis it yields heterogeneous mixture of N-acetyl-D-glucosamine, D-fructose and L-mannose.

HOCH₂ CH20HH HH 04 HOCH2 H매 | H CH H 은 2 NH 애 애 1 6-D-fructose). B-L-Mannose) 개 (62BI). glycosidic glycosidic bond bond IN-acetyl. la-D-glucosamine CH, Ji