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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance5 Marks
Question
DNA and RNA
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Answer

DNARNA
1. DNA is deoxyribonucleic acid.1. RNA is ribonucleic acid.
2. DNA is double stranded, helical molecule.2. RNA is single stranded molecule.
3. In DNA, there is deoxyribose sugar.3. In RNA, there is ribose sugar.
4. The pyrimidine nitrogen bases are cytosine and thymine.4. The pyrimidine nitrogen bases are cytosine and uracil.
5. DNA is the genetic material in all types of organisms.5. RNA is genetic material in few viruses only.
6. In eukaryotic cells, DNA is present in nucleus.6. In eukaryotic cells, RNA is present in nucleus as well as cytoplasm.
7. The number of purine : pyrimidine ratio is always 1 : 1 in DNA molecule.7. The number of purine : pyrimidine ratio may not be 1 : 1 in RNA molecule.
8. DNA sends the codon for the synthesis of proteins, but otherwise it does not participate in the protein synthesis.8. RNA takes part in the protein synthesis through transcription and translation.

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