Multiple Choice
Which nitrogenous base is not found in RNA?
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7. DNA and Chromosome Structure
RNA
Multiple Choice
Which of the following could be a nucleotide of RNA?
A
Thymidine monophosphate (TMP): thymine + deoxyribose + phosphate
B
Uracil + deoxyribose + phosphate
C
Uridine monophosphate (UMP): uracil + ribose + phosphate
D
Adenine + ribose (a nucleoside with no phosphate group)
Verified step by step guidance1
Step 1: Understand the components of a nucleotide. A nucleotide consists of three parts: a nitrogenous base, a sugar (either ribose or deoxyribose), and one or more phosphate groups.
Step 2: Recall the difference between RNA and DNA sugars. RNA nucleotides contain ribose sugar, while DNA nucleotides contain deoxyribose sugar (which lacks one oxygen atom compared to ribose).
Step 3: Identify the nitrogenous bases specific to RNA and DNA. RNA contains adenine (A), guanine (G), cytosine (C), and uracil (U), whereas DNA contains adenine, guanine, cytosine, and thymine (T).
Step 4: Analyze each option by checking if it has the correct sugar (ribose for RNA) and the correct base (uracil instead of thymine) along with a phosphate group to qualify as a nucleotide.
Step 5: Conclude that the correct RNA nucleotide must have uracil as the base, ribose as the sugar, and at least one phosphate group, which matches the description of Uridine monophosphate (UMP).
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