Carbs

Question 1

what two kinds of molecules are in plant starch

Answer 1

Amylose and Amylopectin molecules

Question 2

Amylose has what kind of glycosidic linkage?

Answer 2

alpha 1,4

Question 3

Amylose is made up of what type of molecules

Answer 3

glucose

Question 4

an unbranched polymer of glucose is what?

Answer 4

amylose

Question 5

branched polymers of glucose are what?

Answer 5

Amylopectin

Question 6

Amylopectin has what kind of glycosidic linkage?

Answer 6

alpha 1,4 and alpha 1,6 (beginning of a branch)

Question 7

Amylopectin

Answer 7

highly branched polymer of glucose

Question 8

what is glycogen

Answer 8

branched polymer of glucose

Question 9

lactose and fructose are what?

Answer 9

disaccarides

Question 10

lactose is made up of what two sugars. what is the linkage?

Answer 10

galactose and glucose
beta (pointing up) 1,4 from the galactose

Question 11

if a linkage proceeds in an upward direction from the anomeric carbon what type of link is it

Answer 11

beta

Question 12

why can’t the galactose ring open in lactose

Answer 12

because the anomeric carbon is involved in the linkage to glucose

Question 12

why can’t the galactose ring open in lactose

Answer 12

because the anomeric carbon is involved in the linkage to glucose

Question 13

what are the two anomeric forms of lactose

Answer 13

alpha and beta lactose. the linkage Is always beta. alpha is when there is a change in the sterochemisty

Question 13

what are the two anomeric forms of lactose

Answer 13

alpha and beta lactose. the linkage Is always beta. alpha is when there is a change in the stereochemisty at the anomeric carbon in the glucose

Question 14

sucrose is made up of what two sugars

Answer 14

glucose and fructose

Question 15

what type of linkage in sucrose can it open?

Answer 15

alpha 1,2 glycosidic linkage. It can not open because the anomeric carbon is used in both sugars

Question 16

characteristic of a reducing sugar

Answer 16

it can open one of its rings. all monosaccharides and most disaccharides

Question 17

can sucrose behave as a reducing agent?

Answer 17

no, because it can’t open its ring due to both anomeric carbons being involved in the linkage

Question 18

what is a monosaccharide

Answer 18

any of the class of sugars that cannot be hydrolyzed to give a simpler sugar ex. glucose