RNA

Structure - Messanger RNA is a long single stranded molecule formed into a helix 

Function - It is manufactered in the nucleus and carries the gentic code from the DNA in the nucleus to the ribosome in the cytoplasm

Structure - Ribosomal RNA is a long large complex molecule made up of both double and single helices 

Function - To combine with protiens to make ribosomes 

Structure - Transfer RNA is a small single stranded molecule which forms a clover leaf shape. One end contains the bases CCA - where the amino acids are attached. At the end of the molecule is a series of 3 bases called the anticodon

Function - tRNA molecules bring amino acids to the ribosomes so that proteins can be synthesised