Which of the following are not polymeric?

(a) Nucleic acid                (b) Proteins

(c) Polysaccharides           (d) Lipids

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A non-proteinaceous enzyme is

(a) lysozyme           (b) ribozyme

(c) ligase                (d) deoxyribonuclease

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Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

(a) Glucose -6-phosphate

(b) Fructose 1,6-bisphosphate

(c) Pyruvic acid

(d) Acetyl Co-A

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Which of the following is the least likely to be involved in stabilising the three-dimensional folding of most proteins?

(a) Hydrogen bonds

(b) Electrostatic interaction

(c) Hydrophobic interaction

(d) Ester bonds

 

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Which of the following describes the graph correctly?

(a) Endothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme

(b) Exothermic reaction with energy A in the presence of enzyme and B in the absence of enzyme

(c) Endothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme

(d) Exothermic reaction with energy A in the absence of enzyme and B in the presence of enzyme

 

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Which one of the following statements is wrong?

(a) Cellulose is a polysachharide

(b) Uracil is a pyrimidine

(c) Glycine is a sulphur containing amino acid

(d) Sucrose is a diasaccharide

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A typical fat molecule is made up of

(a) One glycerol and three fatty acid molecules

(b) One glycerol and one fatty acid molecule

(c) Three glycerol and three fatty acid molecules

(d) Three glycerol molecules and one fatty acid molecule

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Which one of the following statement is incorrect ?

(a) A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor.

(b) In competitive inhibition the inhibitor molecule is not chemically changed by the enzyme.

(c) The competative inhibitor does not affect the rate of breakdown of the enzyme-substrate complex.

(d) The presence of the competitive inhibitor decreases the km of the enzyme for the substrate.

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A phosphoglyceride is always made up of

(a) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(b) only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(c) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

(d) a saturated or unsaturated fatty acid esterified to a phosphate group, which is also attached to a glycerol molecule.

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Macromolecule chitin is

(a) nitrogen containing polysaccharide.

(b) phosphorus containing polysaccharide

(c) sulphur containing polysaccharide

(d) simple polysaccharide

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