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5 answers

IN THE NUCLEUS: "Transcription"
1) DNA separates at site of protein making sequence of nucleotides.
2) mRNA specific nucleotides pair up to the exposed side of DNA forming mRNA.
3) mRNA peels off DNA and DNA closes back up.
4) mRNA leaves nucleus, enters the endoplasmic reticulum, travels to the site of a ribosome where the next phase of protein synthesis begins.

IN THE CYTOPLASM: "Translation"
1) mRNA enters the ribosome where tRNA links up anticodon to codon. tRNA carries specific amino acids.
2) Once the amino acis are lined up correctly, dehydration synthesis takes place between them, forming the polypeptide (protein).
3) The tRNA's break free and reenter the cytoplasm where they pick up another amino acid.
4) The protein exits the ribosome, travels down the ER and is packaged for export by the Golgi Apparatus.
5) The mRNA exits the ribosome, travels to the site of another ribosome and repeats transcription again to form another protein.

BIOLOGY TEACHER

2007-03-13 15:51:53 · answer #1 · answered by CAROL P 4 · 0 0

Do you want the long or short answer? Well... let's go for the long one of things I can remember. The DNA splits apart and RNA then forms by matching up the chemical bonds between ATG and C (initials standing for long chemical names that no one uses) on the DNA and AUG and C on mRNA (messenger RNA). This is then taken to the endoplasmic reticulum and the tRNA (transfer RNA) uses the coding of the mRNA to attach amino acids based upon each grouping of three AUG or C chemicals. There is a start command of three chemicals and a stop command. These amino acids then form bonds within the chain and ta-da a protein. The really interesting part is how different cells use different parts of the same DNA. In other words what causes a muscle cell to only use the DNA it needs for being a muscle cell and not the portion of DNA used for a brain cell. Which is why stem cells are so big and very cool. None of their DNA has been "turned off" so they can become any cell. Also interesting is the fact that mitochondria have their own DNA. Mitochondria are little organs (organelles to be precise) that reside in each cell and make energy for that cell. Ok... I've strayed. Sorry.

2007-03-13 23:02:42 · answer #2 · answered by chibimoonsong 1 · 0 0

DNA-mRNA-tRNA-protein. the mRNA transcribes the DNA and goes outside the nucleus to the ribosomes. tRNA carry specific amino acids and join with the mRNA at the ribosome while the amino acids become polymerized.

2007-03-13 22:50:50 · answer #3 · answered by Anonymous · 0 0

hydrogen bonds are broken, mrna comes in and copies the DNA, carries the info to a protein

2007-03-13 22:48:07 · answer #4 · answered by dirka 3 · 0 1

DNA- tRNA-mRNA-protein. That is the story of molecular biology.

2007-03-13 22:47:45 · answer #5 · answered by pdragon7 3 · 0 1

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