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Multiple Choice
Which of the following is not a part of the structure of nucleotides?
A
Pentose sugar
B
Phosphate group
C
Carboxyl group
D
Nitrogenous base
Verified step by step guidance
1
Understand the basic structure of a nucleotide, which consists of three main components: a pentose sugar, a phosphate group, and a nitrogenous base.
Recognize that the pentose sugar in nucleotides can be either ribose (in RNA) or deoxyribose (in DNA). This sugar forms the backbone of the nucleotide structure.
Identify the phosphate group, which is attached to the 5' carbon of the pentose sugar. This group is crucial for forming the backbone of nucleic acids through phosphodiester bonds.
Recognize the nitrogenous base, which is attached to the 1' carbon of the pentose sugar. The base can be a purine (adenine or guanine) or a pyrimidine (cytosine, thymine, or uracil).
Understand that a carboxyl group is not part of the nucleotide structure. Carboxyl groups are typically found in amino acids and fatty acids, not nucleotides.