JEE CHEMISTRY UNIT 19
QUIZ NO 3
TOTAL QUESTIONS = 20
1. What is the role of enzymes in biological systems?
A. Break down molecules
B. Act as catalysts
C. Provide energy
D. Stabilize pH
2. What is the function of enzymes?
A. Structural support
B. Break down molecules
C. Transport molecules
D. Catalysts
3. What is the major protein found in hair?
A. Collagen
B. Elastin
C. Keratin
D. Myosin
4. Which of the following is a saturated fatty acid?
A. Linoleic acid
B. Oleic acid
C. Palmitic acid
D. Stearic acid
5. What is the storage polysaccharide in animals?
A. Cellulose
B. Glycogen
C. Starch
D. Amylose
6. Which of the following is a disaccharide?
A. Lactose
B. Sucrose
C. Maltose
D. Fructose
7. What is the main storage polysaccharide in plants?
A. Starch
B. Lactose
C. Cellulose
D. Fructose
8. Which of the following is a structural protein?
A. Myosin
B. Keratin
C. Collagen
D. Elastin
9. What is the backbone of DNA made of?
A. Nitrogen base and sugar
B. Phosphate and base
C. Phosphate and sugar
D. Sugar only
10. What is the primary structure of a protein?
A. Quaternary structure
B. Folding of the polypeptide chain
C. Sequence of amino acids
D. 3D structure of the protein
11. What is the structure of DNA?
A. Triple helix
B. Double helix
C. Single strand
D. Helical sheet
12. What is the main function of hemoglobin?
A. Hormone regulation
B. Transport oxygen
C. Enzyme activity
D. Protein synthesis
13. Which of the following is an example of a fibrous protein?
A. Myosin
B. Collagen
C. Keratin
D. Elastin
14. Which of the following is a disaccharide?
A. Sucrose
B. Fructose
C. Maltose
D. Lactose
15. Which of the following is an essential amino acid?
A. Proline
B. Valine
C. Lysine
D. Glycine
16. Which of the following is a component of RNA but not DNA?
A. Adenine
B. Thymine
C. Uracil
D. Cytosine
17. What is the storage form of carbohydrates in plants?
A. Glycogen
B. Starch
C. Cellulose
D. Pectin
18. Which of the following is a monosaccharide?
A. Lactose
B. Sucrose
C. Fructose
D. Glucose
19. What is the primary function of enzymes?
A. Signal molecules
B. Provide energy
C. Catalysts
D. Break down molecules
20. What is the role of ATP in cells?
A. Signal molecules
B. Structural support
C. Energy carrier
D. Catalyst for reactions
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