Multiple Choice
Which of the following would be an example of pH-based protein denaturation?
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18. Amino Acids and Proteins
Protein Denaturation
Multiple Choice
Which of the following statements about protein denaturation is true?
A
The amino acid sequence remains intact during and after denaturation.
B
Temperatures above 50ºC are enough to break peptide bonds.
C
All proteins will reform their shape after heat is removed.
D
Covalent bonds within the tertiary structure are strengthened.
Verified step by step guidance1
Understand that protein denaturation involves the disruption of a protein's secondary, tertiary, or quaternary structure without breaking the primary structure, which is the amino acid sequence.
Recall that peptide bonds, which link amino acids in the primary structure, are strong covalent bonds and are not broken by moderate heat such as temperatures above 50ºC; breaking these bonds requires much harsher conditions.
Recognize that denaturation often causes proteins to lose their functional three-dimensional shape, and not all proteins can refold back to their original structure once the denaturing agent (like heat) is removed.
Know that during denaturation, covalent bonds within the tertiary structure (such as disulfide bridges) are generally not strengthened; instead, non-covalent interactions like hydrogen bonds and hydrophobic interactions are disrupted.
Conclude that the true statement is that the amino acid sequence remains intact during and after denaturation, as denaturation affects only the higher-level structures, not the primary sequence.
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