ch 17, 19

ch 17, 19 - 4. The RNA polymerase begins transcription at...

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4. The RNA polymerase begins transcription at the promoter. The promoter is a DNA sequence that determines which DNA strand is used as the template. In eukaryotes the transcription factors must first recognize and bind to the promoter before RNA polymerase II can attach. Bacteria have one type of RNA polymerase, whereas eukaryotes have three kinds. 5. The genetic code is said to be redundant because more than one codon may specify a particular amino acid. In addition, it is considered unambiguous because no codon specifies two different amino acids. 6. The single-stranded, short RNA molecules are arranged into a clover-leaf shape by hydrogen bonding. The anticodon, which base pairs with a complementary codon on mRNA, is at one end and the 3’ end is the attachment site for its amino acid. Wobble enables the third nucleotide of some tRNA anticodons to pair with more than one kind of base in the codon. 7. Each amino acid has a specific aminoacyl-tRNA synthetase that attaches it to
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This note was uploaded on 09/27/2011 for the course BIOL 101 taught by Professor Fevzidaldal during the Fall '08 term at UPenn.

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ch 17, 19 - 4. The RNA polymerase begins transcription at...

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