NAME:_______________________________________________
CARBOHYDRATES
Section A: Multiple Choice Questions (10 Marks)
Choose the best answer for each question.
1. Which of the following BEST defines a carbohydrate?
a) A hydrocarbon chain with nitrogen
b) Polyhydroxy aldehydes or ketones
c) A lipid compound
d) A protein subunit
2. What is the general formula for most simple carbohydrates?
3. Which of the following is a non-reducing sugar?
a) Glucose
b) Fructose
c) Lactose
d) Sucrose
4. The positive result of a Molisch test is the formation of a:
a) Red precipitate
b) Purple ring at the junction
c) Blue-black color
d) Silver mirror
5. Which disaccharide consists of Glucose + Fructose?
a) Lactose
b) Maltose
c) Sucrose
d) Cellulose
6. Which test is specifically used to detect monosaccharides?
a) Barfoed's Test
b) Benedict's Test
c) Iodine Test
d) Molisch Test
7. What is the storage form of glucose in animals?
a) Starch
b) Cellulose
c) Glycogen
d) Chitin
8. The Fischer projection represents:
a) A cyclic ring structure
b) A linear structure of a monosaccharide
c) A disaccharide bond
d) A polysaccharide chain
9. Which monosaccharide is known as fruit sugar?
a) Glucose
b) Fructose
c) Galactose
d) Ribose
10. Iodine test produces a blue-black color with:
a) Glucose
b) Sucrose
c) Starch
d) Fructose
Section B: Structure and Classification (15 Marks)
1. Classification: Define and provide one example for the following (6 Marks):
o Monosaccharide
o Disaccharide
o Polysaccharide
2. Structures: Draw the linear (Fischer) structure of D-Glucose and the Haworth structure
of D-Glucose. (4 Marks)
3. Isomerism: Define "epimers" and identify which carbon is epimeric between D-Glucose
and D-Mannose. (3 Marks)
4. Functional Groups: Carbohydrates are classified as aldoses or ketoses. Explain the
difference. (2 Marks)