The central dogma of molecular biology states that DNA is into mRNA, which is then translated into polypeptides. Eukaryotic ribosomes exist freely floating in the and membrane-bound. In peptide synthesis, after an amino acid has been added to the polypeptide chain, the empty exits the ribosome. Respond to the following based on your reading. Where is the ribosome located in the cell? What is the essential role of the ribosome in gene expression? In which crucial step of gene expression does the ribosome play a major role: transcription or translation? How does the ribosome differ in eukaryotes and prokaryotes? Why is transfer RNA, or tRNA, necessary for protein synthesis? What is the role of ribosomal RNA in the ribosome? What happens if there are no ribosomes present in the cell, or if the ribosomes do not function properly?