Question
Differentiate between DNA and RNA.
✓
Answer
Differences between DNA and RNA :
| DNA | RNA |
| 1. It usually occurs inside nucleus and some cell organelles. | Very little RNA occur inside nucleus. Most of it is found in the cytoplasm. |
| 2. It is a genetic material. | It is not the genetic material except in certain viruses. e.g., Rheovirus. |
| 3. It has deoxyribose sugar. | It has ribose sugar. |
| 4. It is usually double stranded except in certain viruses e.g., $\phi \times 174$. | It is single stranded except in certain viruses e.g. Rheovirus. |
| 5. It has thymine as one of the nitrogenous bases. | Thymine is replaced by uracil in RNA. |
| 6. DNA contains over a million nucleotides. | Depending upon the type, RNA contains 7012000 nucleotides. |
| 7. It replicates to form new DNA molecule. | It normally cannot replicate itself. |
| 8. DNA transcribe genetic information to RNA. | It translates the transcribed message for formating polypeptide. |
| 9. Renaturation after melting is slow. | Renaturation after. melting is quite fast. |
| 10. Its quantity is fixed for cell. | The quantity of RNA of a cell is variable. |
| 11. Purine and pyrimidine bases are in equal number. | Purine and pyrimidine number are not in equal proportion. |
| 12. DNA is fuelgen positive. | RNA is fuelgen negative. |
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