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Biochemistry -Structure and Properties of Amino Acids

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1. When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes




2. What is the end product of leucine metabolism?




3. What is the heaviest of the twenty amino acids?




4. Which of the following amino acids can form hydrogen bonds with their side (R) groups?




5. The isoelectric point of an amino acid is defined as the pH




6. Molecules that bear charged groups of opposite polarity are known as




7. What is the product of the catabolic breakdown of Arginine?




8. Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?




9. An essential amino acid is one that




10. D-Alanine and L-Alanine are technically known as




11. Which of the following pairs of amino acids would carry a negative charge on their side chain at pH 8.0?




12. In a polypeptide average mass of an amino acid residue is




13. Which pair of amino acids absorbs the most UV light at 280 nm?




14. Which of the following is a nonstandard amino acid?




15. Which of the following is an essential amino acid?




16. Protein fluorescence arises primarily from which residue?




17. Which of the following amino acid is known as half-cystine residue?




18. Which of the following is not an essential amino acid?




19. Which of the following is not a sensible grouping of amino acids based on their polarity properties?




20. Proteins and macromolecular structures take on their higher order structures




21. What is the product of the catabolic breakdown of Alanine?




22. How many different amino acids are there?




23. Amino acids required in the human diet and not synthesized by the body are called




24. Which of the following amino acid contain an imidazolium moiety?




25. The sequence of letters 'WYQN' will represent




26. The sulphur containing side chain of cysteine is




27. Which of the following is a nonprotein amino acid?




28. Serine and threonine are polar amino acids due to




29. Which of the following is not the hydrophobic and aromatic amino acid?




30. Stereo chemical configuration of all a-amino acids derived from proteins is




31. The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .




32. Coomassie Blue stains the proteins by reacting with




33. Which amino acid when exposed to ninhydrin produces a brown color?