Multiple Choice
Which nucleic acid provides the master code for protein synthesis?
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4. Biomolecules
Nucleic Acids
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Which nitrogenous base is found in DNA but not in RNA?
A
Uracil
B
Cytosine
C
Adenine
D
Thymine
Verified step by step guidance1
Step 1: Understand the structure of nucleic acids. DNA and RNA are composed of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base.
Step 2: Learn the nitrogenous bases in DNA. DNA contains four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
Step 3: Learn the nitrogenous bases in RNA. RNA contains adenine (A), guanine (G), cytosine (C), and uracil (U) instead of thymine.
Step 4: Compare the bases in DNA and RNA. Thymine is unique to DNA, while uracil is unique to RNA.
Step 5: Conclude that the nitrogenous base found in DNA but not in RNA is thymine.
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