Milady Cosmetology Practice Exam

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Which type of bond is a weak, temporary side bond between adjacent polypeptide chains?

Covalent Bond
Hydrogen Bond
Salt Bond
Disulfide Bond

The correct answer is: Salt Bond

The correct answer identifies a hydrogen bond as the weak, temporary side bond between adjacent polypeptide chains. Hydrogen bonds are formed due to the attraction between a hydrogen atom that is covalently bonded to a more electronegative atom (like oxygen or nitrogen) and another electronegative atom. In the context of polypeptide chains, these interactions are crucial for creating the secondary structure of proteins, such as alpha-helices and beta-pleated sheets. While covalent bonds and disulfide bonds are much stronger and more stable forms of interaction within the protein structure, they do not fit the description of weak, temporary bonds. Salt bonds, also known as ionic bonds, are stronger than hydrogen bonds but still do not exhibit the same temporary nature. Understanding the role of hydrogen bonds in proteins can help in various applications, such as predicting protein behavior and stability in different environments.