Proteins amino acids peptide bond protein structure and denaturation - Question Bank
1. If a protein is denatured and then the denaturing agent is removed, can the protein regain its original structure and function?
2. Which amino acid has an indole ring system in its side chain?
3. What is the name of the bond that links the alpha-carbon to the amino group in an amino acid?
4. The loss of secondary, tertiary, and quaternary structures while retaining the primary structure is characteristic of:
5. The process by which a protein folds into its functional three-dimensional structure is called:
6. Which of the following is a polar amino acid with a hydroxyl group in its side chain?
7. What is the most abundant protein in the human body?
8. Which amino acid side chain contains a sulfur atom?
9. The structure of collagen, a fibrous protein, is characterized by a:
10. Which amino acid has an imidazole ring in its side chain?
11. Denaturation of proteins by heavy metal ions like Hg²⁺ or Pb²⁺ often involves:
12. Which type of protein structure is primarily determined by the sequence of codons in mRNA?
13. The isoelectric point (pI) of an amino acid is the pH at which:
14. The Zwitterionic form of an amino acid is:
15. Which of the following is an essential amino acid?
16. What is the term for amino acids that cannot be synthesized by the body and must be obtained from the diet?
17. The peptide bond has partial double bond character due to:
18. Which amino acid side chain is acidic?
19. Which amino acid side chain is polar and uncharged?
20. A protein consisting of only one polypeptide chain will not exhibit which level of structure?
21. Which of the following is NOT a type of amino acid found in proteins?
22. The biological activity of a protein is directly dependent on its:
23. The folding of a polypeptide chain into an alpha-helix or beta-pleated sheet is characteristic of which protein structure level?
24. Which amino acid has a side chain that can form a covalent disulfide bond?
25. The statement 'proteins are polymers of amino acids' refers to which level of protein structure?
26. Denaturation by strong acids or bases primarily affects which type of interaction in a protein?
27. Which type of bond is most likely to be disrupted by a significant increase in temperature during protein denaturation?
28. When an egg is cooked, the proteins in the egg white undergo denaturation. This process is:
29. What happens to the primary structure of a protein during denaturation?
30. Which of the following agents can cause protein denaturation?
31. What is the process called when a protein loses its native three-dimensional structure and, consequently, its biological function?
32. Hemoglobin, which carries oxygen, is an example of a protein with which level of structure?
33. What level of protein structure describes the arrangement of multiple polypeptide subunits in a protein complex?
34. Disulfide bonds are covalent bonds formed between the side chains of which amino acid?
35. Hydrophobic amino acid residues tend to cluster in the interior of a protein in an aqueous environment. This is an example of:
36. Which type of interaction is primarily responsible for maintaining the tertiary structure of a protein?
37. What level of protein structure describes the overall three-dimensional shape of a single polypeptide chain?
38. In a beta-pleated sheet, polypeptide chains are held together by hydrogen bonds between:
39. The alpha-helix is stabilized by what type of bonds?
40. Which of the following are common secondary structures of proteins?
41. What level of protein structure refers to the linear sequence of amino acids?
42. A chain of amino acids linked by peptide bonds is called a:
43. When a peptide bond is formed, what small molecule is released?
44. The formation of a peptide bond involves the reaction between:
45. What type of bond is formed between two amino acids during protein synthesis?
46. Which amino acid is achiral (does not have a chiral center)?
47. What distinguishes one amino acid from another?
48. What functional groups are present in every amino acid?
49. How many common types of amino acids are found in proteins?
50. What is the fundamental building block of proteins?