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