Book : Botany
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Posted by: CHELSEA
posted by
Writer CHELSEA

RNA

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RNA: RiboNucleic Acid. Used to transfer the genetic code from the nucleus to the ribosomes to make proteins. RNA is used to transmit genetic information in some organisms and may have been the molecule used to store genetic blueprints in primitive organisms. RNA usually is a single-strand helix consisting of shorter chains of nucleotides. Composition of ribose sugarphosphate backbone adenine, guanine, cytosine, uracil bases. RNA is synthesized from DNA on an as-needed basis. The O-H bond in the ribose of RNA makes the molecule more reactive, compared with DNA. 

RNA is not stable under alkaline conditions, plus the large grooves in the molecule make it susceptible to enzyme attack. RNA is constantly produced, used, degraded, and recycled. Compared with DNA, RNA is relatively resistant to UV damage. Depending on the type of RNA, this molecule is found in a cells nucleus, its cytoplasm, and its ribosome. Adenine links to uracil (A-U) and cytosine links to guanine (C-G). Helps carry out DNA\'s blueprint guidelines. Transfers genetic code needed for the creation of proteins from the nucleus to the ribosome. The helix geometry of DNA is of A-Form. RNA strands are continually made, broken down and reused.Purine and Pyrimidine bases are in unequal in number. The strand may get folded at places to produce a secondary helix or pseudohelix. Some RNAs are very short lived while other have somewhat longer life.


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