1. Which of the following is not an aromatic amino acid ?   Serine   Tryptophan   Tyrosine   Phenylalanine   Hint Half-n-half Clue   2. Successive amino acids in the polypeptide chains that make up a protein are held together by :   phosphodiester bonds   N-glycosidic bonds   peptide bonds   interprotamine disulfide bonds   Half-n-half Clue   3. The sequence of different amino acids in the polypeptide chain of a protein is called its :   primary structure   Quaternary structure   tertiary structure   secondary structure   Half-n-half Clue   4. Each protein has a particular 3D structure which is decided by its:   secondary structure   primary structure   tertiary structure   Quaternary structure   Half-n-half Clue   5. 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 interactions between amino acid side chains.   its structure resulting from the union of more than one protein molecule, called subunit proteins.   its amino acid sequence   Half-n-half Clue   6. Which of the following amino acids is polar ?   Leucine   Isoleucine   Valine   Histidine   Half-n-half Clue   7. How many different amino acids are found in proteins ?   20   30   27   infinite   Half-n-half Clue