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.