* Protein synthesis: RNA carries genetic information from DNA to ribosomes, where proteins are made.
* Regulation of gene expression: RNA molecules can regulate which genes are expressed and to what extent.
* Catalysis: Some RNA molecules have catalytic activity, meaning they can act as enzymes.
Key differences from DNA:
* Sugar: RNA contains ribose sugar, while DNA contains deoxyribose sugar.
* Base: RNA has uracil (U) instead of thymine (T) found in DNA.
* Structure: RNA is typically single-stranded, while DNA is double-stranded.
Types of RNA:
* Messenger RNA (mRNA): Carries genetic information from DNA to ribosomes.
* Transfer RNA (tRNA): Brings amino acids to ribosomes for protein synthesis.
* Ribosomal RNA (rRNA): Forms the structural and catalytic core of ribosomes.
* Small RNA (sRNA): Involved in gene regulation and other cellular processes.
In summary, RNA is a vital molecule in the cell that plays diverse roles in gene expression, protein synthesis, and other essential biological functions. It differs from DNA in its sugar, base, and structure, but shares the important function of carrying genetic information.
