Lecture 33-Gene Structure and Function

Lecture 33-Gene Structure and Function - Lecture 33- Gene...

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Lecture 33- Gene Structure and Function tRNA -Comes from transcription (similarly, all RNA comes from transcribed DNA) -Consists of many Hydrogen bonds; pairs with itself. Picture on right is of one linear piece of DNA that has folded up Ribosomes -Made of RNA and a bit of protein -Ribosome contains tRNA in the middle, with RNA and protein surrounding Gene Expression -In the above diagram, the chromosome is split into two and the DNA template strand is transcripted by the mRNA. During translation, the mRNA produces a polypeptide, made of multiple amino acids (the protein). Promoters -Specify where in the DNA transcription begins -In prokaryotes and eukaryotes, the promoter is immediately upstream of the site where transcription initiates; eukaryotic promoters more complex -AT pairs very common in promoters (fewer H bonds) -Promoters have polarity, they point in one direction or the other -RNA polymerase understands and recognizes promoters (reads 3’-5’); the only promoter with information will be read 3’-5’, it just depends on which way the promoter is pointing
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Lecture 33-Gene Structure and Function - Lecture 33- Gene...

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