Lecture 21

Question 1

Homoglycans

Answer 1

polysaccharides assembled from all the same sugar

Question 2

Heteroglycans

Answer 2

polysaccharides assembled from different sugars

Question 3

What are the different roles of carbohydrates

Answer 3

-energy and fuel for cells (glucose as immediate energy source) -energy storage for cells (polysaccharides, starch & glycan used for this) -structural elements in the cell (plant cell was, arthropod exoskeletons) -metabolic intermediates -part of backbone structure for nucleotides (polynucleotides)

Question 4

Monosaccharide molecules

Answer 4

consist of two families: -aldoses-contain one aldehyde group and hydroxyl groups -ketoses-contain one ketone group and hydroxyl groups

Question 5

L isomer

Answer 5

has the OH group on the Left

Question 6

D isomer

Answer 6

Has the OH group on the right

Question 7

Draw D-Glyceraldehyde

Answer 7

Question 8

Draw D-Erythrose

Answer 8

Question 9

D-Ribose

Answer 9

Question 10

Draw D-Glucose

Answer 10

Question 11

Draw D-Manose

Answer 11

Question 12

Draw D-Galactose

Answer 12

Question 13

Draw Dihydroxyacetone

Answer 13

Question 14

Draw D-Ribulose

Answer 14

Question 15

Draw D-Xyulose

Answer 15

Question 16

Draw D-Fructose

Answer 16