1. Which of the following is not an aromatic amino acid ?   Serine   Tyrosine   Tryptophan   Phenylalanine   Hint Half-n-half Clue   2. Which of the following is not a type of protein secondary structure ?   Turns   third level folding to form small globules   á-helix   â-pleated sheet   Half-n-half Clue   3. The Quaternary structure of a protein is :   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   its structure resulting from interactions between amino acid side chains.   Half-n-half Clue   4. Successive amino acids in the polypeptide chains that make up a protein are held together by :   N-glycosidic bonds   phosphodiester bonds   peptide bonds   interprotamine disulfide bonds   Half-n-half Clue   5. Which of the following amino acids is polar ?   Isoleucine   Leucine   Histidine   Valine   Half-n-half Clue   6. How many different amino acids are found in proteins ?   20   27   infinite   30   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 :   Prions   proteomes   exteins   proteinoids   Half-n-half Clue