RNA stands for Ribose Nucleic Acid .
RNA is present in all the living cells .
It is present in cytoplasm and nucleus .
It directs protein synthesis .
It is genetic material in few viruses .
Example - TMV
Based on sorving as genetic material .RNA is of two types
A- Genetic RNA
In viruses bacterial phages RNA is genetic material instead of DNA .
Example - TMV pea viruses
B- Non-genetic RNA
There are organisms .Where DNA acts as genetic material .
On that case RNA is non-genetic .It is synthesized on DNA template .
Non- genetic RNA is of three types
a- Messenger RNA or m-RNA
b- Transfer RNA or t-RNA
c- Ribosomal RNA or r- RNA
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