Thursday, March 4, 2010

chapter 17. From Gene to protein

Q. what is the name of the process that make RNA from DNA?
Transcription

Q. what is the name of the process that make protein from RNA?
Translation
Q. Where does it happen during transcription?
in nucleus

the five facts
1.DNA is a huge information database that carries the complete set of instructions for making all the proteins a cell will ever need
2.there are only four different bases in DNA (A, C, G and T), the order in which the bases occur determines the information to make a protein
3.A nucleic acid very similar to DNA, called mRNA or messenger RNA, is a copy of a gene, and serves this function the "bridge" between DNA and protein
4.The sugar in DNA is deoxyribose; in RNA it is ribose
5.DNA is "transcribed" or re-written into RNA in a very complicated process called transcrption.

diagram
Transcription : in the nucleus, the cell's machinery copies the gene sequence into mRNA, a molecule that is similar to DNA

Translation : the protein- making machinery, called the ribosome, reads the mRNA sequence and translates it into the amino acid sequence of the protein














video
http://www.youtube.com/watch?v=983lhh20rGY&feature=related

summary
The DNA that makes up the human genome can be subdivided into information bytes called genes. Each gene encodes a unique protein that performs a specialized function in the cell.Cells use the two-step process of transcription and translation to read each gene and produce the string of amino acids that makes up a protein.

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