Q. No.Given below is the graph showing the effect of substrate concentration on enzyme activity. In the presence of a competitive inhibitor, when the concentration of the substrate is progressively increased:
1.
The Km value increases but the reaction will not achieve Vmax
2.
The Km value increases but the reaction can ultimately achieve Vmax
3.
The Km value decreases but the reaction will not achieve Vmax
4.
The Km value decreases but the reaction can ultimately achieve Vmax
Study the primary structure of a part of a hypothetical protein and choose the correct statements:
| I: | 1 is Serine |
| II: | 2 is sulfur containing amino acid and can be methionine |
| III: | 3 is aromatic amino acid and can by tyrosine |
| IV: | 4 is an acidic amino acid |
2. I, III and IV only
3. II, III and IV only
4. I, II, III and IV
Which of the following biomolecules does have a phosphodiester bond?
| 1. | Fatty acids in a diglyceride |
| 2. | Monosaccharides in a polysaccharide |
| 3. | Amino acids in a polypeptide |
| 4. | Nucleic acids in a nucleotide |
The chitinous exoskeleton of arthopods is formed by the polymerisation of
(1) keratin sulphate and chondroitin sulphate
(2) D-glucosamine
(3) N-acetyl glucosamine
(4) lipoglycans
Which one of the following statements is correct, with reference to enzymes?
(1) Apoenzyme = Holoenzyme + Coenzyme
(2) Holoenzyme = Apoenzyme + Coenzyme
(3) Coenzyme = Apoenzyme + Holoenzyme
(4) Holoenzyme = Coenzyme + Cofactor
Which of the following is not a polymeric substance?
(1) Nucleic acid
(2) Proteins
(3) Polysaccharides
(4) Lipids
Which of the following is the least likely to be involved in stabilising the three-dimensional folding of most proteins?
(1) Hydrogen bonds
(2) Electrostatic interaction
(3) Hydrophobic interaction
(4) Ester bonds
Which of the following describes the graph correctly?
(1) Endothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme
(2) Exothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme
(3) Endothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme
(4) Exothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme
Which one of the following statements is wrong?
(1) Cellulose is a polysachharide
(2) Uracil is a pyrimidine
(3) Glycine is a sulphur containing amino acid
(4) Sucrose is a diasaccharide
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