- Proteins are polypeptide.They are linear chains of amino acid linked by
(a) glycosidic bond
(b) peptide bond
(c) phosphoric bond
(d) all the above
2. Each protein is a polymer of
(a) amino acid
(b) glucose
(c) lipids
(d) All the above
3. For nucleic acid , the building block is a
(a) glucose
(b) nucleotide
(c) amino acid
(d) all the above
4. In a polysaccharide the individual monosaccharides are linked by a
(a) peptide bond
(b) lipid bond
(c) glycosidic bond
(d) all the above
5. There are ……. hydrogen bonds between A and T
(a) 2
(b) 3
(c) 4
(d) all the above
6. The pitch of DNA is
(a) 33 Angstrom
(b) 34 Angstrom
(c) 32 Angstrom
(d) all the above
7. What is the full form of RuBisCO?
a) Ribosome bisphosphate Carboxylase-Oxidase
b) Ribulose bisphosphate Carboxylase-Oxidase
c) Ribosome bisphosphate Carboxy-Oxygenase
d) Ribulose bisphosphate Carboxylase-Oxygenase
8. Which of these is not a function of protein?
Major constituent of the cell membrane
Transport of nutrients
Defense against pathogens
Regulation of homeostasis
9. Which of these is a hormone?
a) Collagen
b) Keratin
c) Insulin
d) GLUT-4
10. Assertion: Arachidic acid is an unsaturated fatty acid. Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are true but the Reason is not the correct explanation of
Assertion.
(c) Assertion is true, but Reason is false.
(d) Both Assertion and Reason are false.
11. A segment of DNA has 120 adenine and 120 cytosine bases. The total number of
nucleotides present in the segment is
(a) 120
(b) 240
(c) 60
(d) 480
12. The fastest enzyme known is
(a) DNA polymerase
(b) carbonic anhydrase
(c) carbonic dehydrogenase
(d) DNA ligase
13. Metabolic intermediates found in the living system which are essential for growth and life is called……..
(a) Saponins
(b) Tannins
(c) Secondary metabolite
(d) Primary metabolite
14. Which biomolecule is distributed more widely in a cell?
(a) Chloroplast
(b) RNA
(c) DNA
(d) Spaherosome
15. Koshland’s theory of enzyme action is known as
(a) Lock and key theory
(b) Reduced fit theory
(c) Induced fit theory
(d) Enzyme coenzyme theory
16. Enzymes that catalyse the removal of groups from substrates by mechanisms other than
hydrolysis, and addition of groups to double bonds, are called.
(a) lyases
(b) dehydrogenases
(c) Both
(d) None of these
17. The helical structure of protein is stabilized by
(a) Hydrogen bonds
(b) Disulphide bonds
(c) Peptide bonds
(d) None of these
18. _____ is the most abundant protein in animal world.
( a ) Collagen
( b ) Ribulose bisphosphate Carboxylase-Oxygenase (RuBisCO)
( c ) Haemoglobin
( d ) Globulin
19. Which group belongs to basic amino acid?
( a) Lysine and arginine
( b) Glutamate and aspartate
( c) Alanine and glycine
( d) All of the above
20. All the carbon compounds that we get from living tissues can be called ______.
( a) Biomolecules
( b) Carbohydrate
( c) Protein
( d) Fat
21. Amino acids which occur in proteins are only of________types.
( a) 13
( b) 20
( c) 31
( d) 46
22. Amino acids on the basis of number of amino and carboxyl groups are
( a) Acidic amino acids
( b) Basic amino acids
( c) Neutral amino acids
( d) All of these
23. Alkaloids, flavonoids, rubber, essential oils, antibiotics, coloured pigments, scents, gums,
spices are examples of
( a) Nucleosides
(b) Purines
( c) Secondary metabolites
( d) Nucleotides
24. The general mechanism is that an enzyme acts by:
( a) Increasing activation energy
( b) Decreasing pH value
( c) Increasing the pH value
( d) Reducing the activation energy
25. Enzymes which catalyse oxidoreduction between two substrates
( a) Transferases
( b) Oxidoreductases/dehydrogenases
( c) Hydrolases
( d) Lyases