1. Which of the following amino acids is polar ?   Isoleucine   Leucine   Histidine   Valine   Hint Half-n-half Clue   2. Which of the following is not a type of protein secondary structure ?   â-pleated sheet   á-helix   third level folding to form small globules   Turns   Half-n-half Clue   3. 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   4. The sequence of different amino acids in the polypeptide chain of a protein is called its :   tertiary structure   Quaternary structure   secondary structure   primary structure   Half-n-half Clue   5. The Quaternary structure of a protein is :   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.   its structure resulting from hydrogen bonds between the C=O and N-H groups of different amino acids.   Half-n-half Clue   6. Successive amino acids in the polypeptide chains that make up a protein are held together by :   peptide bonds   N-glycosidic bonds   interprotamine disulfide bonds   phosphodiester bonds   Half-n-half Clue   7. How many different amino acids are found in proteins ?   20   27   30   infinite   Half-n-half Clue