Which one of the following organic compounds is correctly identified along with its related function?
Correct answer: A. Lecithin - A component of cell membranes
- A. Lecithin - A component of cell membranes
- B. Adenine - A nucleotide that makes up nucleic acids
- C. Triglyceride - Major source of energy
- D. Uracil - A component of DNA
Explanation
The correct answer is A: Lecithin. Lecithin is a phospholipid that is essential for the structure and functionality of cell membranes, allowing cells to maintain their integrity and facilitate communication. Option B is incorrect because adenine, while a component of nucleotides in nucleic acids, is not a nucleotide by itself. Option C, while referring to triglycerides correctly as a source of energy, is vague and misleading since it does not specify the entire structure of triglycerides. Option D is incorrect because uracil is not a component of DNA; it is found in RNA instead, where it replaces thymine.
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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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