The polypeptide chains in a protein molecule usually do not _.
Correct answer: B. Lie flat
- A. Remain stable
- B. Lie flat
- C. Acquire coiling
- D. Acquire folding
Explanation
Most of the primary proteins are folded, refolded and aggregated to acquire secondary, tertiary and quaternary structural levels, respectively.The reason why polypeptide chains do not lie flat is because of the properties of the amino acids that make up the chains. Amino acids have both polar and nonpolar groups, and these groups interact with each other in a specific way. The polar groups are attracted to water, while the nonpolar groups are repelled by water. This means that the polypeptide chain will coil and fold in a way that minimizes the contact between the nonpolar groups and water.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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