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What are different types of RNA which are found in cell? |
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Answer» RNA molecules are classified according to their structure and function into three major types. 1. Ribosomal RNA (r – RNA) 2. Messenger RNA (m – RNA) 3. Transfer RNA (t – RNA) r-RNA: rRNA is mainly found in cytoplasm and in ribosomes, which contain 60% RNA and 40% protein. Ribosomes are the sites at which protein synthesis takes place. t – RNA: tRNA molecules have lowest molecular weight of all nucleic acids. They consist of 73 – 94 nucleotides in a single chain. The function of tRNA is to carry amino acids to the sites of protein synthesis on ribosomes. m – RNA: mRNA is present in small quantity and very short lived. They are single stranded, and their synthesis takes place on DNA. The synthesis of mRNA from DNA strand is called transcription. mRNA carries genetic information from DNA to the ribosomes for protein synthesis. |
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