Carbohydrates Midterm Exam

Question 1

Classify as Reducing or Non Reducing Sugars: Glucose

Answer 1

Reducing

Question 2

Classify as Reducing or Non Reducing Sugars: Lactose

Answer 2

Reducing

Question 3

Classify as Reducing or Non Reducing Sugars: Fructose

Answer 3

Non Reducing

Question 4

Classify as Reducing or Non Reducing Sugars: Sucrose

Answer 4

Non Reducing

Question 5

Which does not belong to the group of monosaccharides

Answer 5

diose

Question 6

Reactions Monosaccharides may undergo

Answer 6

Oxidation, Reduction, Fermentation, Esterification

Question 7

The test to determine the presence of a reducing sugar in a sample

Answer 7

Benedict’s Test, Clini Test, Tollen’s Test, Fehling’s Test

Question 8

Which monosaccharide is otherwise known as glycerose

Answer 8

Glyceraldehyde

Question 9

Which compound is commonly known as dextrose

Answer 9

Glucose

Question 10

Which pair of compounds are entiomers

Answer 10

D-Erythrulose, C-Erythrulose

Question 11

How many compounds are classified as aldose

Answer 11

3

Question 12

How many compounds are classified as ketose

Answer 12

4

Question 13

Which compound is classified as aldohexose

Answer 13

D-Glucose

Question 14

Identify the aldopentose

Answer 14

D-Ribose

Question 15

how many compounds are classified as triose

Answer 15

2

Question 16

Which monosaccharides have three chiral carbon atoms in their structures

Answer 16

Ribose, Fructose

Question 17

Which compound has no chiral carbon atom

Answer 17

Dihydroxyacetone

Question 18

Which pentose is a component of RNA

Answer 18

D-Ribose

Question 19

What is true about glyceraldehyde and duhydroxycetone

Answer 19

Both are Isomers

Question 20

Sucrose + H20 ->

Answer 20

Glucose + Fructose

Question 21

Glucose + CuO -> NaOH/heat ______ + Cu2O + H2O

Answer 21

Gluconic, Glucorunic, Sacaric

Question 22

glucose + [H] ->

Answer 22

Sorbitol

Question 23

C6H12O6 + H2O -> yeast _____ + CO2

Answer 23

Ethyl/Wine Alcohol

Question 24

The bond linking two monosaccharides together to form a dissacharide is known as

Answer 24

Glycosidic Linkage / Bond

Question 25

Disaccharide yielding galactose upon hydrolisis

Answer 25

Lactose

Question 26

What disaccharide is formed through a - 1,4 glyosidic linkage

Answer 26

Maltose / Lactose

Question 27

What disaccharide does not ferment in the presence of yeast

Answer 27

Lactose

Question 28

In sucrose, the a- glucose is linked to B-fructose using what type of glycosidic linkage

Answer 28

a - 1,2

Question 29

When β -glucose bonds with α -glucose, α -maltose is produced. The linkage is ?

Answer 29

B - 1,4

Question 30

the polysaccharide functions as a blood anticoagulant?

Answer 30

Heparin

Question 31

Which is stored in the liver and muscle and turns red upon reaction with water?

Answer 31

Glycogen

Question 32

It gives bulk to the feces and prevents constipation

Answer 32

Fiber

Question 33

A carbohydrates that may be given intravenously?

Answer 33

Dextrose/Glucose

Question 34

Explain why sucrose is a non-reducing sugar?

Answer 34

Because there is no available CHO group on ketone group for oxidation Sucrose is a non-reducing sugar because the two monosaccharide units are held together by a glycosidic linkage between C1 of α-glucose and C2 of β-fructose.