Friday, September 25, 2009

RNA (RIBONUCLEIC ACID) (Short Note)

RNA occurs in Nucleoli, chromosomes and cytoplasm (about 90% of the cells RNA occurs in the cytoplasm). RNA chemically consists of 5 carbon ribose sugar. RNA is single stranded molecule/ RNA is chemical messenger and plays a key role in the process of Protein synthesis,

RNA consists of sugars, bases and Phosphoric acid. Sugar is ribose against Deoxyribose in DNA. In RNA the bases are adenine, guanine, uracil and cytosine i.e. they mine of DNA is replaced by uracil. Various types of RNA are found in plant cells. These are (a) messenger RNA (mRNA) which carries the information contained in DNA (b) transfer RNA (t RNA) also known as soluble RNA which work as adaptor molecules for carrying amino acids to the site of Protein synthesis (c) ribosomal RNA (r RNA) which is associated with ribosome. All these three types are monogenetic RNA.

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