A biomolecule is a molecule found in organisms that is required for one or more biological processes such as cell division, morphogenesis, or development. Biomolecules include large macromolecules such as proteins, carbohydrates, lipids, and nucleic acids, as well as small molecules such as primary metabolites, secondary metabolites, and natural products.
Biomolecules are essential components of all living organisms. Endogenous biomolecules are produced within organisms, but organisms usually require exogenous biomolecules to survive, such as certain nutrients.
The majority of biomolecules are organic compounds, and the human body is only made up of four elements: oxygen, carbon, hydrogen, and nitrogen.
Download Class 12 Chemistry Worksheet on Chapter 14 Biomolecules PDF- Set 5
CBSE Class 12 Chemistry Worksheet Chapter 14 Biomolecules – Set 5
Q1. Complete hydrolysis of cellulose gives-
a.) L–glucose
b.) D–fructose
c.) D–ribose
d.) D–glucose
Q2. Which of the following hormones is an amino acid derivative?
a.) Oxytocin
b.) Estrone
c.) Adrenaline
d.) Vasopressin
Q3. A basic amino among the following is-
a.) glycine
b.) valine
c.) proline
d.) histidine
Q4. Which of the vitamins given below is water-soluble?
a.) Vitamin E
b.) Vitamin K
c.) Vitamin C
d.) Vitamin D
Q5. How many monosaccharides are obtained by hydrolysis of sucrose?
a.) 1
b.) 2
c.) 3
d.) 4
Q6. Give the Howarth projection of D-glucopyranose.
Q7. Why is cellulose not digested in the human body?
Q8. Mention two important functions of carbohydrates in plants.
Q9. What is the difference between native protein and denatured protein?
Q10. What is essentially the difference between ⍺-form of glucose and ꞵ-form of
glucose? Explain.
Q11. i.) Acetylation of glucose with acetic anhydride gives glucose penta-acetate. Write the structure of penta–acetate.
ii.) Explain why glucose penta–acetate does not form oxime?
iii.) Sucrose is dextrorotatory, but the mixture obtained after hydrolysis is laevorotatory. Explain.
Q12. Carbohydrates are essential for life in both plants and animals. Name the carbohydrates that are used as storage molecules in plants and animals. Also, name the carbohydrate present in wood or the fibre of cotton cloth.
Q13. Give reasons:
i.) On electrolysis in acidic solution, amino acids migrate towards the cathode while in alkaline solution these migrate towards the anode.
ii.) The monoamino monocarboxylic acids have two pk values.
Q14. Differentiate between hormones and vitamins.
Q15. Explain the following terms:
i.) Biocatalyst
ii.) Polypeptides
iii.) Glycosidic Linkage
Q16. Glucose or sucrose are soluble in water but cyclohexane and benzene are insoluble in water. Explain.
Q17.
i.) Name a source of vitamin E.
ii.) Name the disease caused due to deficiency of vitamin K in our body.
iii.) Write any four important functions of carbohydrates.
Q18. Define with an example:
i.) Isoelectric point
ii.) Mutarotation
iii.) Transcription
Q19. Explain the structure of glucose.
Q20. Describe the action of the following reagents on glucose:
i.) HI
ii.) Hydroxyl amine (NH2OH)
iii.) Hydrogen cyanide
iv.) Bromine water
v) dil. Nitric acid
vi.) Acetic anhydride.
Download PDF to access answers of Chemistry Worksheet for Class 12 Chemistry Chapter 14 Biomolecules Set – 5
Download PDF
