Steven detrie protein synthesis model
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The document describes the process of protein synthesis, which occurs in two steps: transcription and translation. In transcription, DNA is unwound and an mRNA strand is created using nucleotides. In translation, the mRNA strand is sent to the cytoplasm where it binds to a ribosome. tRNA molecules then bind to the ribosome and add amino acids specified by the mRNA code, forming a peptide bond between amino acids and creating a protein chain.
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1) In the nucleus, RNA polymerase unzips DNA and copies its sequence into a messenger RNA (mRNA) strand.
2) The mRNA exits the nucleus through the nuclear pore and enters the cytoplasm.
3) In the cytoplasm, the mRNA binds to a ribosome which reads its sequence in groups of three bases (codons).
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The document depicts the process of transcription in which RNA polymerase binds to the promoter region of DNA and uses the DNA as a template to synthesize messenger RNA (mRNA) by adding complementary nucleotides. The mRNA contains the start codon and stop codon and is created through the pairing of adenine-thymine, cytosine-guanine, phosphate and sugar nucleotides added by RNA polymerase.Steven detrie protein synthesis model
- 1. Protein Synthesis By Steven Detrie
- 38. Summary The first step is transcription. The first step in transcription is the unwinding of the DNA molecule so that some DNA that codes for the needed protein can be transcribed. After the DNA molecule unwinds, the enzyme, RNA polymerase lines up nucleotides to create a strand of mRNA. After transcription, the new RNA strand is released and the two unzipped DNA strands bind together again. Since after this occurs the DNA strand is back to normal this step can repeat.
- 39. Summary The next step is Translation. In this, mRNA is sent to the cytoplasm, where it binds to the RNA. Once the mRNA is in place, tRNA molecules bind to the ribosome defined by the mRNA code. At its tail end, tRNA has a stem that attaches to a specific amino acid. At its head, it has three nucleotides that make up an anticodon. Translation begins with the binding of the mRNA chain to the ribosome. The tRNA molecule forms a base pair with the mRNA. A peptide bond is formed between the amino acid attached to the tRNA.