Basic Biochemistry Welcome to your Basic Biochemistry test. 1. Charged form of amino acids, Is neutral at pH 7 and this form is called as zwitterion Only COOH is ionised at pH 7 and this form is called as zwitterion Only NH3+ group is ionised at pH7 and this form is called as zwitterion Both the groups are ionised at pH 7 and this form is called as zwitterion None 2. The biological properties of the proteins are conferred by Physical properties of the amino acids Chemical properties of the amino acids Surrounding molecules of the proteins Concentration of the proteins in the cytoplasm 1&2 None 3. Which of the following amino acid does not have ionisable side chain? Asp Glu Tyr Lys None 4. Proteins are formed of one or mode polypeptides. True False None 5. Which of the following amino acid is most commonly involved in the disulphide bond formation? Cys Asp Ser Glu None 6. Primary structure of the protein is The sequence of the mRNA coding for the corresponding protein The 3-D structure attained by the protein in vitro The amino acid sequence of the polypeptide The sequence of the amino acids that form the active site or binding site of the proteins None 7. Functionality of the proteins depends on Overall 3-d structure of the protein Chemical properties of the constituent amino acids Intronic sequences All of the above 1 & 2 None 8. Peculiar characteristic of the amino acids is, It can form large number of the conformational variety in the protein structure It acts as acids and also as base It makes protein work under wide range of pH Only 1 1&2 None 9. Proteins are made of Glucose Amino acids Cholesterol Nucelosides None 10. Which of the following is true? pKa values of carboxyl groups in all amino acids are same pKa values of carboxyl groups in the same amino acid are same Neighbouring chemical groups in amino acids influence the pKa value of the group None of the above None 11. Paper chromatography separates amino acids based upon Net electrical charge Mass of the molecule 3-D structure of the amino acid pKa values None 12. The difference between the paper electrophoresis and paper chromatography is Electric potential is applied between the two ends of the paper in electrophoresis In paper electrophoresis total charge on the molecule is responsible for the separation In paper chromatography molecules separate on the basis of the partition coefficient All of the above. None 13. According to Henderson-hasselbalch equation, in buffers pKa value of the compound is constant pH value is independent of the pKa pH value is dependent upon the -log pKa pH value is nothing but the log pKa None 14. Amino acids are linked by Ether bond Phospho-diester bond Peptide bond Glycosidic bond None 15. Aliphatic groups of the amino acids tend weakly donate the electrons True False None Please fill in the comment box below. Time's up
