RNA Protein synthesis

RNA (RNA = ribonucleic acid)
• Three different types of RNA, (messenger (mRNA), transfer (tRNA) ribosomal (rRNA))
• All are made in the nucleus (transcription)

• ribosomes are synthesised in the nucleolus;
• mRNA prepared there too – introns removed

• All types of RNA are involved in protein synthesis:

• mRNA: copies the information from the DNA.
• tRNA: carries the specific amino acid to the mRNA in contact with the ribosome.
• rRNA: makes up 55% of ribosomes (the other 45% = protein).