Important questions of biomolecules

BIOMOLECULES

QUESTIONS

VSA TYPE QUESTIONS (1 - MARK QUESTIONS)

1. Name polysaccharide which is stored in the liver of animals.

2. What structural feature is required for a carbohydrate to behave as

reducing sugar?

3. How many asymmetric carbon atoms are present in D (+) glucose?

4. Name the enantiomer of D-glucose.

5. Give the significance of (+)-sign in the name D-(+)-glucose.

6. Give the significance of prefix ‘D’ in the name D-(+)-glucose.

7. Glucose is an aldose sugar but it does not react with sodium hydrogen

sulphite. Give reason.

8. Why is sucrose called invert sugar?

9. Name the building blocks of proteins.

10. Give the structure of simplest optically active amino acid.

11. Name the amino acid which is not optically active.

12. Write the Zwitter ionic form of aminoacetic acid.

13. Name the enzyme which catalyses the hydrolysis of maltose into glucose.

14. Give reason : Amylase present in the saliva becomes inactive in the

stomach.

15. How would you explain the amphoteric behavior of amino acids.

16. Which forces are responsible for the stability of  – helical structure of

proteins.

17. How are polypeptides different from proteins.

18. Which nucleic acid is responsible for carrying out protein synthesis in the

cell.

19. The two strands in DNA are not identical but complementary. Explain.

20. When RNA is hydrolysed, there is no relationship among the quantities of

different bases obtained. What does this fact suggest about the structure

of RNA.

21. What type of linkage holds together the monomers of DNA and RNA.

22. Mention the number of hydrogen bonds between adenine and thymine.

23. A child diagnosed with bone deformities, is likely to have the deficiency of

which vitamin?

24. What is meant by the term DNA fingerprinting?

25. List two important functions of proteins in human body.

26. Name the vitamin responsible for coagulation of blood.

27. Except vitamin B12, all other vitamins of group B, should be supplied

regularly in diet. Why?

28. How is glucose prepared commercially?

29. What is the structural difference between glucose and fructose?

30. What is the difference between an oligosaccharide and a polysaccharide.

31. Give the Haworth projection of D-glucopyranose.

SA (I) TYPE QUESTIONS (2 - MARK QUESTIONS)

1. What are anomers. Give the structures of two anomers of glucose.

2. Write the hydrolysed products of

(i) maltose (ii) cellulose.

3. Name the two components of starch? Which one is water soluble?

4. (i) Acetylation of glucose with acetic anhydride gives glucose

pentaacetate. Write the structure of the pentaacetate.

(ii) Explain why glucose pentaacetate does not react with hydroxylamine?

5. What are vitamins? How are they classified?

6. (i) Why is sucrose called a reducing sugar?

(ii) Give the type of glycosidic linkage present in sucrose.

7. Classify the following as monosaccharides or oligosaccharides.

(i) Ribose (ii) Maltose

(iii) Galactose (iv) Lactose

8. Write the products of oxidation of glucose with

(a) Bromine water (b) Nitric acid

9. State two main differences between globular and fibrous proteins.

10. Classify the following amino acids as neutral, acidic or basic.

(i) HOOC – CH2 – CH (NH2) COOH

(ii) C6H5 – CH2 – CH(NH2) COOH

(iii) H2N – (CH2)4 – CH(NH2) – COOH

11. You have two amino acids, i,e. glycine and alanine. What are the structures

of two possible dipeptides that they can form?

12. What are essential and non essential amino acids? Give one example of

each type.

13. Name four type of intermolecular forces which stabilize 2° and 3° structure

of proteins.

14. Classify the following as globular or fibrous proteins.

(i) Keratin (ii) Myosin

(iii) Insulin (iv) Haemoglobin.

15. What do you understand by

(a) denaturation of protein (b) specificity of an enzyme.

16. On electrolysis in acidic solution amino acids migrate towards cathode

while in alkaline solution they migrate towards anode.

17. (i) Name the disease caused by deficiency of vitamin D.

(ii) Why cannot vitamin C be stored in our body?

18. Define the terms hypervitaminosis and avitaminosis.

19. Explain what is meant by :

(i) a peptide linkage (ii) a glycosidic linkage?

20. Give the sources of vitamin A and E and name the deficiency diseases

resulting from lack of vitamin A and E in the diet.

21. What are the main functions of DNA and RNA in human body.

SA(II) TYPE QUESTIONS (3 - MARK QUESTIONS)

1. How are carbohydrate classified?

2. (i) Name four bases present in DNA.

(ii) Which of them is not present in RNA.

(iii) Give the structure of a nucleotide of DNA.

3. Differentiate between the following :

(i) secondary and tertiary structure of protein.

(ii) α-Helix and β-pleated sheet structure of protein.

(iii) fibrous and globular proteins.