GENETIC –NUCLEIC ACID

The Structure Of An RNA Molecules RNA is ma up of : Ribose sugar Phosphate A nitrogenous base , e.g. Purine (adenine and guanine ) and pyrimidines (cytosine and uracil )•RNA exists largely as single nucleotide chains in living The RNA strand is made up of alternating molecules of ribose sugar and phosphateA sugar, a nitrogenous base and a phosphate together form a ribonucleotideAn RNA molecule is a polymer of ribonucleaotides

RNA structure elements

THE DIFFERENCES BETWEEN DNA AND RNA

TYPES AND LOCATION OF RNA mRNA ( MESSENGER RNA) t RNA ( TRANSFER RNA ) r RNA (RIBOSOMAL RNA) c RNA ( CATALYTIC RNA ) sn RNA ( SMALL NUCLEAR RNA ) sno RNA ( SMALL NUCLEOLAR RNA)

mRNA

Single strand RNA nucleotides A poly nucleotide strand synthesized according to the code of the DNA It carries the code in base triplet (codon)form , from the DNA to the ribosome Found in the nucleus of the cell.

t RNA STRUCTURE A SINGLE RNA FOLDED IN THE SHAPE OF A CLOVER LEAF

IT CARRRIES A SPECIFIC AMINO ACID ON ONE END AND TRANSFER IT TO THE RIBOSOMES

HAS ANTICODON ON THE OTHER, THE ANTICODON BASE – PAIRS WITH A COMPLEMENTARY CODON ON m RNA

RIBOSOMAL RNA

RIBOSOMAL RNA

The two ribosomal subunits (large and small ) are made of protein and ribosomal RNA (r RNA)The single –stranded molecule of r RNA is variously folded and twisted upon itself in certain region forming a secondary structure .Found in the ribosome in the cytoplasm of the cell