A) Both are double stranded
B) Both have identical sugar molecules
C) Both have identical pyrimidine bases
D) Both are polymers of nucleotides
Correct Answer: D
Solution :
The comparison between DNA and RNA| S. No. | DNA | RNA |
| 1. | DNA is usually double-stranded , (in certain viruses DNA is single stranded, e.g.,\[\phi X\,174\]) | Most cellular RNA is single stranded. (Some viruses e.g., Reovirus have double stranded RNA). |
| 2. | The pentose sugar is deoxyribose. | The pentose sugar is ribose. |
| 3. | The common organic bases are adenine, guanine, cytosine and thymine. | The common organic bases are adenine, guanine, cytosine and uracil. |
| 4. | Base pairing adenine pairs with thymine and guanine with cytosine. | Adenine pairs with uracil and guanine with cytosine. |
| 5. | DNA on replication forms DNA and on transcription froms RNA. | Usually RNA does not replicate or transcribe. (In certain vieruses RNA can synthesize an RNA chain). |
| 6. | Genetic messages are usually encoded in DNA. | The usual function of RNA is translating messages encoded in DNA into proteins. |
| 7. | DNA consists of a large number of nucleotides, up to 4.3 million. | RNA consists of fewer nucleotides, up to 12,000. |
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