Which of the following statements about functional tRNAs are correct? Circle all

Question

Which of the following statements about functional tRNAs are correct? Circle all that apply They contain many modified nucleosides About half their nucleosides are in base-paired helical regions They contain fewer than 100 rib nucleotides Their anticodons and amino acid accepting regions are within 5Aof each other They consist of two helical stems that are joined by loops to form a U-shaped structure They have a terminal AAC sequence at their amino acid accepting end Explain why tRNA molecules must have both unique and common structural features How many errors would be expected to occur In a 1000-amino acid protein given an error frequency of 10^-3? In an experiment, it was found that Cys-tRNA^Cys can be converted to Ala-tRNA^Cys and used in an in vitro system that is capable of synthesizing proteins. If the Ala-tRNA^Cys were labeled with^14C in the amino acid, would the labeled Ala be incorporated in the protein in the places where Ala residues are expected to occur? Explain

Explanation / Answer

True, yes they contain the most number of modified nucleosides besides the Four in other RNAs True, because the base paired helical region i.e. sterm loop are 3 in tRNA. True, they are generally made of 80 to 90 nucleotides. False, generally both are within 10 bp region so they have minimum size of 10 angstrom. False, tRNA is L shaped and there is three loop stems. False, they have terminal CCA 3’ sequence.

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