1. A polysaccharide of unknown structure was isolated, subjected to exhaustive methylation, and hydrolyzed. Analysis of the products revealed three methylated sugars: 2,3,4-tri-O-methyl-D-Glucose, 2,4-di-O-methyl-D-glucose and 2,3,4,6-tetra-O-methyl-D-glucose, in the ratio 20:1:1. What is the structure of the polysaccharide?

Can somebody check if my answer is rght? Thank you

Complex carbohydrates

Indicate whether each of the following statements about polysaccharides is True or False.

1. Polysaccharides are long polymers made of many nucleotides that have been joined through dehydration synthesis. False
2. Cellulose is the main storage polysaccharide in plants while glycogen is an important storage polysaccharide in many animals. False
3. Both starch and glycogen are composed of α-glucose subunits. True
4. Starch is composed of amylose and amylopectin, which are unbranched and branched chains of α-glucose subunits, respectively. False
5. Like amylopectin, glycogen is insoluble in water, but it has a longer average chain length and fewer branches. True
6. Although some polysaccharides are used to store energy, others serve as structural material for cells. True
7. The principal structural polysaccharide in plants is starch. True
8. Cellulose is composed of a long, branched chain of β-glucose subunits. True
9. The starch-hydrolyzing enzymes produced by most organisms cannot break the bond between two α -glucose subunits because they only recognize β linkages. False
10. Chitin is a structural polysaccharide found in the exoskeleton of arthropods and the cell wall of many fungi. True

1.) What is the endosymbiont theory? Does it still happen in the world today?

2.) What do you mean by the "RNA World Hypothesis"?

3.) Starch, cellulose, and glycogen are all polysaccharides composed of glucose. What makes each of these polysaccharides unique in spite of the fact that all are composed solely of glucose?

Glucose and galactose are components of many disaccharides,oliogsaccharides, and polysaccharides. Sort these commoncarbohydrates to indicate if they contain glucose, galactose, orboth.

Items (6 items) (Drag and drop into the appropriate areabelow)

• Lacto-N-tetraose
• Maltose
• Raffinose
• Starch
• Sucrose
• Lactose