(i) Only L- q - amino acids; (ii) Only D-amino acids; (iii) Dl-amino acids; (iv) Both (i) and (ii).2. The optically inactive amino acid is(i) Glycine; (ii) Serine; (iii) Threonine; (iv) Valine.3. Since the pK values for aspartic acid are 2.0,3.9 and 10.0, it follows that its isoelectric pH is(i) 3.0 (ii) 3.e (iii) 5.e (iv) 6.0.4. At neutral pH, a mixture of amino acids in solution would be predominantly(i) Dipolar ions; (ii) Nonpolar molecules; (iii) Positive and monovalent; (iv) Hydrophobic.5. Neutral amino acid is(i) Leucine; (ii) Lysine; (iii) Aspartic acid; (iv) Histidine.6. ln many proteins the hydrogen bonding produces a regular coiled arrangement which is called as(i) B-Helix; (ii) o-Helix; (iii) Both (i) and (ii); (iv) Spiral.7. Thiol group of cysteine gives red colour with(i) Sodium acetate; (ii) Lead acetate; (iii) Sodium nitroprusside; (iv) Barfoed's reagent.8. ln denaturation of proteins, the bond which is not broken is(i) Disulphide bond; (ii) Peptide bond; (iii) Hydrogen bond; (iv) lonic bond.9. One round of Edman degradation of the peptide H2ll- GIy-Arg-Lys-Phe-Asp- COOH wouldresult in which of the following structures or their phenyl isothiocyanate derivatives?(i) H2N-Gly-Arg-COOH + H2N-Lys-Ph+- Asp-{OOH;(ii) H2N-Gly-Arg-Lys-Phe-COOH + Asp;(iii) H2N-Arg-Lys-Phe-Asp-COOH + Gly;(iv) HzN-G ly-Arg-Lys-COO H + Hz N'Phe-Asp-COO H.10. An example of storage protein is(i) Glutelin; (ii) Actin; (iii) Serum albumin; (iv) Nucleoprotein.11. Coagulated protein is a form of(i) Complete proteins; (ii) Metaproteins; (iii) Primary derived proteins; (iv) Secondary derived proteins.12. Tubular bio-composite fabrication is commonly done by(i) RIM; (ii) Prepreg layup; (iii) SMC; (iv) Filament winding.​