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