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Your praxis Biology test prep center
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An anticodon is made primarily of what?

Posted By: Admin on January 8, 2010 in Actual Praxis Biology Question, Biology Lecture- Review - Comments: 1 Comment »

An anticodon is made primarily ofAn anticodon is the three nucleotide sequence on transfer RNA (tRNA) that complements mRNA. It is used to translate mRNA into protein. what?

Definition: An anticodon is a unit made up of three nucleotides which play an important role in various DNA cycles, including RNA translation .

An RNA strand has an anticodon. Is it tRNA or mRNA?

Roles of 3 types of RNA – 1. mRNA mRNA (messenger RNA) – Function: carries information from genes to cytoplasm to be translated Many types of mRNA (many different genes) mRNA is fairly large (103-104 nucleotides depending on size of protein mRNA is short lived – turned over rapidly 2. tRNA (transfer RNA) Function: Allow amino acids to recognize the genetic code in mRNA Relatively small RNA – 80 nucleotides Are long lived – can be used over many times ~45 different types that are similar in structure Contain 2 critical sites amino acid attachment site – pair of nucleotides on one end anticodon site – 3 base sequence that is complementary to a codon tRNA attaches to specific amino acid and allows it to recognize the codon in mRNA through its anticodon tRNA – Critical step in translation Adding the right amino acid to the corresponding tRNA Accomplished by specific enzymes – aminoacyl-tRNA synthetases Amino acids must first be activated aa + ATP AMP-aa + PPi AMP-aa + tRNA aa-tRNA + AMP sy 

 

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