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

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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

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Which one of the following statements is correct, with reference to enzymes?

(a) Apoenzyme = Holoenzyme + Coenzyme

(b) Holoenzyme = Apoenzyme + Coenzyme

(c) Coenzyme = Apoenzyme + Holoenzyme

(d) Holoenzyme = Coenzyme + Cofactor

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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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