All of the following are subunits of DNA except:
Correct answer: D. Choline
- A. Deoxyribose sugar
- B. Phosphate group
- C. Nitrogenous base
- D. Choline
Explanation
The correct answer is Choline. DNA is composed of nucleotides, which include a deoxyribose sugar, a phosphate group, and a nitrogenous base. These components form the structural framework of DNA. Choline, on the other hand, is not a component of DNA; it is a component of phospholipids in cell membranes. Therefore, choline is the correct choice as it is not a subunit of DNA.
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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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