The following statements describe the structure of a certain protein molecule.1-The molecule consists of two polypeptide chains which are folded around each other.2-In each chain, the amino acids are held in a helix by hydrogen bonds.Which orders of structure are described by these statements?
Correct answer: D. Secondary and Quaternary
- A. Primary and Secondary
- B. Secondary and Tertiary
- C. Primary and Quaternary
- D. Secondary and Quaternary
Explanation
The correct answer is D) Secondary and Quaternary. The statements describe features of both the secondary and quaternary structures of proteins. The secondary structure involves the formation of helices in each chain due to hydrogen bonding, which is clearly mentioned. The quaternary structure involves the interaction and arrangement of multiple polypeptide chains, as indicated by the description of two chains folded around each other.Options A and C are incorrect because they do not account for the quaternary structure. Option B is incorrect because it doesn't fully address the quaternary structure, which involves multiple polypeptide chains interacting.
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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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