Phosphatidic acid upon combining with a nitrogenous base gives rise to:
Correct answer: B. Phosphatidylcholine
- A. Phosphatidic acid
- B. Phosphatidylcholine
- C. Phospholipid
- D. Lecithin
Explanation
The correct answer is Phosphatidylcholine. When phosphatidic acid combines with a nitrogenous base like choline, it forms phosphatidylcholine, a specific type of phospholipid that is abundant in cell membranes. Phosphatidic acid is incorrect because it does not itself combine with a nitrogenous base; it is a precursor. Phospholipid is too broad of an answer, as it refers to the general class of molecules formed, not the specific one created by this reaction. Lecithin is a mixture of phospholipids.
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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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