Multiple Choice
A glucose molecule is to starch as __________.
4. Biomolecules
Nucleic Acids
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Which of the following are pyrimidines found in the nucleic acid DNA?
A
Adenine and guanine
B
Thymine and adenine
C
Uracil and guanine
D
Guanine and cytosine
E
Thymine and cytosine
Verified step by step guidance1
Understand the structure of nucleic acids: DNA is composed of four types of nitrogenous bases, which are divided into two categories: purines and pyrimidines.
Identify the purines: In DNA, the purines are adenine (A) and guanine (G). These have a two-ring structure.
Identify the pyrimidines: In DNA, the pyrimidines are thymine (T) and cytosine (C). These have a single-ring structure.
Recognize the difference between DNA and RNA: While DNA contains thymine, RNA contains uracil instead of thymine.
Apply this knowledge to the options given: Thymine and cytosine are the pyrimidines found in DNA, as they both have a single-ring structure.
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