Proteins amino acids peptide bond protein structure and denaturation - One Line Questions

1. How many common types of amino acids are found in proteins? — 20
2. In a beta-pleated sheet, polypeptide chains are held together by hydrogen bonds between: — Backbone amide and carboxyl groups of adjacent strands
3. Which amino acid is achiral (does not have a chiral center)? — Glycine
4. Which of the following is NOT a type of amino acid found in proteins? — Guanine
5. Which of the following is an essential amino acid? — Tryptophan
6. Which of the following are common secondary structures of proteins? — Alpha-helix and Beta-pleated sheet
7. What functional groups are present in every amino acid? — Amino group and carboxyl group
8. When a peptide bond is formed, what small molecule is released? — Water
9. The Zwitterionic form of an amino acid is: — An amino acid with both a positive and negative charge, making it neutral overall
10. Which amino acid has an imidazole ring in its side chain? — Histidine
11. Which of the following is a polar amino acid with a hydroxyl group in its side chain? — Serine
12. The process by which a protein folds into its functional three-dimensional structure is called: — Protein folding
13. Denaturation of proteins by heavy metal ions like Hg²⁺ or Pb²⁺ often involves: — Displacing essential metal ions or forming bonds with sulfhydryl groups
14. The structure of collagen, a fibrous protein, is characterized by a: — Triple helix
15. What is the most abundant protein in the human body? — Collagen
16. What type of bond is formed between two amino acids during protein synthesis? — Peptide bond
17. Hydrophobic amino acid residues tend to cluster in the interior of a protein in an aqueous environment. This is an example of: — Hydrophobic effect
18. What is the process called when a protein loses its native three-dimensional structure and, consequently, its biological function? — Denaturation
19. The loss of secondary, tertiary, and quaternary structures while retaining the primary structure is characteristic of: — Denaturation
20. Denaturation by strong acids or bases primarily affects which type of interaction in a protein? — Ionic bonds and hydrogen bonds
21. What happens to the primary structure of a protein during denaturation? — It remains intact.
22. Which amino acid side chain is acidic? — Aspartic acid
23. Disulfide bonds are covalent bonds formed between the side chains of which amino acid? — Cysteine
24. If a protein is denatured and then the denaturing agent is removed, can the protein regain its original structure and function? — Sometimes (renaturation is possible for some proteins)
25. What is the term for amino acids that cannot be synthesized by the body and must be obtained from the diet? — Essential amino acids
26. What is the fundamental building block of proteins? — Amino acids
27. What is the name of the bond that links the alpha-carbon to the amino group in an amino acid? — Amide bond
28. Which type of interaction is primarily responsible for maintaining the tertiary structure of a protein? — Various interactions including hydrophobic interactions, ionic bonds, hydrogen bonds, and disulfide bridges between R-groups
29. Which type of bond is most likely to be disrupted by a significant increase in temperature during protein denaturation? — Hydrogen bonds and hydrophobic interactions
30. The alpha-helix is stabilized by what type of bonds? — Hydrogen bonds between backbone atoms
31. Which of the following agents can cause protein denaturation? — All of the above
32. A chain of amino acids linked by peptide bonds is called a: — Polypeptide
33. Hemoglobin, which carries oxygen, is an example of a protein with which level of structure? — Quaternary
34. The folding of a polypeptide chain into an alpha-helix or beta-pleated sheet is characteristic of which protein structure level? — Secondary
35. A protein consisting of only one polypeptide chain will not exhibit which level of structure? — Quaternary
36. What level of protein structure refers to the linear sequence of amino acids? — Primary structure
37. What level of protein structure describes the overall three-dimensional shape of a single polypeptide chain? — Tertiary structure
38. What level of protein structure describes the arrangement of multiple polypeptide subunits in a protein complex? — Quaternary structure
39. The biological activity of a protein is directly dependent on its: — Tertiary or Quaternary structure
40. When an egg is cooked, the proteins in the egg white undergo denaturation. This process is: — Irreversible
41. The statement 'proteins are polymers of amino acids' refers to which level of protein structure? — Primary
42. Which type of protein structure is primarily determined by the sequence of codons in mRNA? — Primary structure
43. Which amino acid has a side chain that can form a covalent disulfide bond? — Cysteine
44. Which amino acid side chain contains a sulfur atom? — Methionine
45. The peptide bond has partial double bond character due to: — Resonance between the carbonyl oxygen and the amide nitrogen
46. The formation of a peptide bond involves the reaction between: — The carboxyl group of one amino acid and the amino group of another
47. The isoelectric point (pI) of an amino acid is the pH at which: — The amino acid carries no net electrical charge (Zwitterionic form predominates)
48. What distinguishes one amino acid from another? — The side chain (R-group)
49. Which amino acid has an indole ring system in its side chain? — Tryptophan
50. Which amino acid side chain is polar and uncharged? — Serine
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