Which of the following bases is absent in DNA?
Correct answer: A. Uracil
- A. Uracil
- B. Thymine
- C. Cytosine
- D. Adenine
Explanation
Adenine, guanine, and cytosine are the N2 containing bases present in both DNA and RNA. Uracil is present in RNA and absent in DNA while thymine is present in DNA, and absent in RNA.
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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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