BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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RNA contains pyrimidines while DNA contains purines.
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The sugar in DNA contains one less oxygen than the sugar in RNA.
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DNA forms a double helix while RNA is able to fold in on itself.
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RNA is thought to have evolved before DNA.
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Detailed explanation-1: -Answer and Explanation: The correct answer is: (c) DNA contains alternating sugar-phosphate molecules whereas RNA does not contain sugars.
Detailed explanation-2: -The purines in DNA are adenine and guanine, the same as in RNA. The pyrimidines in DNA are cytosine and thymine; in RNA, they are cytosine and uracil. Purines are larger than pyrimidines because they have a two-ring structure while pyrimidines only have a single ring.
Detailed explanation-3: -Thus, the major difference between DNA and RNA is that DNA is double-stranded and RNA is single-stranded. DNA is responsible for genetic information transmission, whereas RNA transmits genetic codes that are necessary for protein creation.
Detailed explanation-4: -Purines. Adenine and guanine are found in both DNA and RNA.