Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life. They range from small molecules such as primary and secondary metabolites and hormones to large macromolecules like proteins, nucleic acids, carbohydrates, lipids etc.
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.
Download Chemistry Worksheet Class 12 Chapter 14 Biomolecules PDF – Set 1
CBSE Class 12 Chemistry Worksheet Chapter 14 Biomolecules – Set 1
Q1. Carbohydrates obtaining more than 10 simple units of sugar are called:
a.) Monosaccharides
b.) Disaccharides
c.) Trisaccharides
d.) Polysaccharides
Q2. Which of the following is a protein?
a.) Glycogen
b.) Amylopectin
c.) Keratin
d.) Lecithin
Q3. Night blindness may be caused by the deficiency of vitamin-
a.) A
b.) B
c.) C
d.) D
Q4. Which of the following gives maximum energy in metabolic process?
a.) Proteins
b.) Vitamins
c.) Lipids
d.) Carbohydrates
Q5. The relation between nucleotide triplets and the amino acids is called:
a.) Gene
b.) Genetic code
c.) Replication
d.) Enzymes
Q6. How do anomers differ from epimers?
Q7. What are reducing and non reducing sugars? What is the structural feature characterising reducing sugars?
Q8. Write the formula of a tripeptide alanylglycyl phenylalanine.
Q9. Define the following terms:
a.) Anomers
b.) Peptide bond
Q10. Describe the terms D– and L– configurations used for amino acids with example.
Q11. Coagulation of egg white on boiling is an example of denaturation of protein. Explain in term of structural changes.
Q12. What are neutral, acidic and basic amino acids? Which vitamin deficiency leads to scurvy? Mention one function of Vitamin C.
Q13. What type of forces are responsible for the formation of :
a.) Cross linking of polypeptide chains
b.) ⍺-helix formation
c.) β-sheet structure
Q14. a.) What is denaturation of proteins?
b.) What type of bonds hold a DNA double helix together?
c.) Which enzyme is present in saliva? What is the function?
Q15. Differentiate between globular and fibrous proteins.
Q16. Name a disease that is caused due to deficiency of the following vitamins:
a.) Thiamine
b.) Riboflavin
c.) D
Q17. Write reactions to show how glucose separately reacts with
i.) NH2OH
ii.) HNO3
iii.) ammoniacal AgNO3
b.) What do you understand by renaturation of proteins?
Q18. What are enzymes? How do enzymes differ from ordinary chemical catalysts? Comment on the specificity of enzyme action. What is the most important reason for their specificity?
Q19. The two strands in DNA are not identical but are complementary. Explain.
Q20. a.) What is glycogen? How is it different from starch?
b.) How is starch structurally different from cellulose?
c.) Explain what is meant by the following:
Peptide linkage and pyranose structure of glucose.
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