1. 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   Hint Half-n-half Clue   2. Which of the following amino acids is polar ?   Histidine   Leucine   Valine   Isoleucine   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 :   proteomes   proteinoids   exteins   Prions   Half-n-half Clue   4. The sequence of different amino acids in the polypeptide chain of a protein is called its :   primary structure   tertiary structure   secondary structure   Quaternary structure   Half-n-half Clue   5. The Quaternary structure of a protein is :   its amino acid sequence   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 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   interprotamine disulfide bonds   N-glycosidic bonds   phosphodiester bonds   Half-n-half Clue   7. How many different amino acids are found in proteins ?   27   20   infinite   30   Half-n-half Clue