The enzyme involved in the of a DNA strand is ___ and it elongates DNA in the __

Question

The enzyme involved in the of a DNA strand is ___ and it elongates DNA in the ___ direction? A. DNA polymerase III and 3-5' and 5-3' B. DNA ligase and 5-3' C. DNA polymerase III and 5-3' D. topoisomerase arid 5-3' E. Helicase and 3-5' The enzyme ___ solves the problem of replication at the ends of linear chromosome which method? A. centromere by adding a single 5' cap structure that resists degradation by nucleases B. telomerase by causing specific double strand DNA to break into blunt ends on both strands C. toposimerase causing linear ends of the newly replicated DNA to circularize D. helicase adding numbers short DNA sequences such as TTAGGG, which form a hairpin turn E. telomerase by adding numerous GC pairs that maintain chromosome integrity The enzyme polynucleotide phosphoylase randomly assembles nucleotides into a polynucleotide polymer. You add polynucleotide phosphorylase to a solution of ATP and GTP. How many artificial mRNA codons be possible? A. 3 B. 4 C. 8 D. 16 E. 64 A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be In eukaryotes, there are three different types of RNA polymerase. Which type is involved in transcription of mRNA for a globin protein? A. ligase B. RNA polymerase I C. RNA polymerase II D. RNA polymerase III E. primase A. the two DNA strands have completely separated and expose the promoter. B. several transcription factors must be bound to the promoter. C. the 5' caps are removed from the mRNA. D. the DNA introns are removed from the template. E. DNA nucleases have isolated the transcription unit In an experimental situation, a student researcher inserts an mRNA molecule into an EUKARYOTIC CELL after he has removed its 5' cap and poly (A) tail. Which of the following would you expect him to find? A. The mRNA could not exit the nucleus to be translated. B. The cell recognizes the absence of the tall and polyadenylates the mRNA. C. The molecule is digested by restriction enzymes in the nucleus. D. The molecule is digested by exonucleases since it is no longer protected at the 5' end. E. The molecule attaches to a ribosome and is translated, but more slowly. A particular tripet of bases in the coding sequence of DNA is ATG. The anticodon on the tRNA that binds the mRNA codon is A mutant bacterial cell has defection aminoacyl synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of a phenylalanine. The consequence of this for the cell will be that A. none of the protein in the cell will contain phenylalanine. B. proteins in the cell will include instead of at positions specified by the codon UUU C. the cell will compensate for the defect by attaching phenylalanine to tRNAs with anticodons. D. the will skip a codon every time a UUU is encountered. E. None of the above will occur, the cell will recognize the error and destroy the tRNA.

Explanation / Answer

1) DNA polymerase III , 5-3-c

2) E is the correct answer

3) C is the correct answer

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