A mutant bacterial cell has a defective aminoacyl synthetase that attaches a lys

Question

A mutant bacterial cell has a defective aminoacyl synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine. The consequence of this for the cell will be that A) the cell will compensate for the defect by attaching phenylalanine to tRNAs with lysine-specifying anticodons. B) none of the options will occur: the cell will recognize the error and destroy the tRNA. C) none of the proteins in the cell will contain phenylalanine. D) proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU. E) the ribosome will skip a codon every time a UUU is encountered. In eukaryotic cells, transcription cannot begin until. A) the 5' caps are removed from the mRNA. B) several transcription factors have bound to the promoter. C) DNA nucleases have isolated the transcription unit. D) the DNA introns are removed from the template. E) the two DNA strands have completely separated and exposed the promoter.

Explanation / Answer

Answer:

11). D). proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU.

12). B. Sevaral transcription factors have bound to the promoter

Explanation:

Transcription factors are proteins involved in the process of converting or transcribing DNA into RNA. They include a wide number of proteins, excluding RNA polymerase, that initiate and regulate the transcription of genes.

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