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