1. Which of the following is not a type of protein secondary structure ?   á-helix   third level folding to form small globules   Turns   â-pleated sheet   Hint Half-n-half Clue   2. How many different amino acids are found in proteins ?   20   infinite   30   27   Half-n-half Clue   3. The Quaternary structure of a protein is :   its structure resulting from interactions between amino acid side chains.   its structure resulting from hydrogen bonds between the C=O and N-H groups of different amino acids.   its structure resulting from the union of more than one protein molecule, called subunit proteins.   its amino acid sequence   Half-n-half Clue   4. Successive amino acids in the polypeptide chains that make up a protein are held together by :   N-glycosidic bonds   peptide bonds   phosphodiester bonds   interprotamine disulfide bonds   Half-n-half Clue   5. Each protein has a particular 3D structure which is decided by its:   secondary structure   tertiary structure   Quaternary structure   primary structure   Half-n-half Clue   6. Which of the following amino acids is polar ?   Histidine   Valine   Leucine   Isoleucine   Half-n-half Clue   7. Infectious self-reproducing agents consisting only of protein, with no nucleic acids (hypothesized in 1982 by Nobel Laureate Stanley B. Prusiner) are called :   exteins   proteinoids   Prions   proteomes   Half-n-half Clue