1. Messenger RNA (mRNA), single, uncoiled strand which brings instructions from DNA in the nucleus to the site of protein synthesis.
2. Ribosomal RNA (rRNA), globular form, makes up the ribosome –the construction site of proteins binds ( site of protein synthesis); binds to the mRNA and uses the instructions to assemble the amino acids in the correct order.
3. Transfer RNA (tRNA) single, folded strand that delivers the proper amino acid to the site at the right time
Protein Synthesis: 2 step process 1. Transcription 2. translation
Transcription: DNA -> mRNA
In the nucleus, enzymes make an RNA copy of a portion of a DNA strand in a process called transcription .
The main difference between transcription and DNA replication is that transcription results in the formation of one single-stranded RNA molecule rather than a double-stranded DNA molecule.