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
A typical fat molecule is made up of
(1) One glycerol and three fatty acid molecules
(2) One glycerol and one fatty acid molecule
(3) Three glycerol and three fatty acid molecules
(4) Three glycerol molecules and one fatty acid molecule
Which one of the following statement is incorrect ?
1. A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor.
2. In competitive inhibition the inhibitor molecule is not chemically changed by the
enzyme.
3. The competative inhibitor does not affect the rate of breakdown of the enzyme-
substrate complex.
4. The presence of the competitive inhibitor decreases the km of the enzyme for the
substrate.
A phosphoglyceride is always made up of
1. only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group
is also attached
2. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate
group is also attached
3. a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a
phosphate group is also attached
4. a saturated or unsaturated fatty acid esterified to a phosphate group, which is also
attached to a glycerol molecule.
The essential chemical components of many coenzymes are
1. Proteins
2. Nucleic acids
3. Carbohydrates
4. Vitamins
Given below is the diagrammatic representation of one of the categories of small
molecular weight organic compounds in the living tissues. Identify the category shown
and the one blank component X in it
Category Component
1. Cholesterol Guanin
2. Amino acid NH2
3. Nucleotide Adenine
4. Nucleoside Uracil
Which one is the most abundant protein in the animal world?
1. Trypsin
2. Haemoglobin
3. Collagen
4. Insulin
Which one out of A-D given below correctly represents the structural formula of the basic amino acid?
1. C
2. D
3. A
4. B