How is mRNA produced in the nucleus of a cell?
Genes in DNA encode protein molecules. The first step of expressing a gene is transferring the information in DNA to a messenger RNA (mRNA) molecule, by a process called transcription. DNA Helicase unwinds the DNA double helix by breaking the hydrogen bonds down the centre of the strand. One strand of the DNA acts a template for complementary base-pairing. RNA nucleotides are attracted to the exposed bases and they are joined together by RNA polymerase. The resulting pre-mRNA molecule is then spliced to remove introns, and the resulting single stranded mRNA can then be used for translation into a protein molecule.
JT
Related Biology A Level answers
All answers ▸Describe the part played by each of the organelles involved in the production and secretion of the enzymes. (10)
Describe the process of Oxidative Phosphorylation in the light dependent stage of photosynthesis
Describe the process of glycolysis
Explain how changing one base in a DNA sequence may result in a non-functional protein being produced.