14. The S-cap on a processed mRNA consists of (A) N-formyl methionine (B) severa
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14. The S-cap on a processed mRNA consists of (A) N-formyl methionine (B) several adenosine nucleotides(C) 8-oxoguanosine diphosphate (D) 7-methyl-guanosine triphosphate (E) 5-methyl-adenosine-triphosphate of RNA polymerase is 15. The E coli RNA polymerase is involved in transcription initiation; whereas the involved in elongation. (A) holoenzyme; core enzyme (C) holoenzyme; holoenzyme (B) core enzyme; holoenzyme (D) core enzyme; core enzyme 16. In 1940, Nobel Laureate Barbara McClintock discovered sequences of DNA that can move around to different positions within the maize genome and cause mutations. These sequences are called (A) transposons (B) inverted repeats (C) direct repeats (D) introns (E) exons 17. The 3>5' exonuclease activity of DNA polymerase I in E. coli is responsible for (A) removal of the primer (B) removal of nucleotides with mismatched bases (E) formation of a final phosphodiester bond between two DNA fragments (C) removal of introns (D) addition of new nucleotides 18. An allosteric protein is (A) a protein that binds to DNA (B) a protein that changes shape when it binds a small molecule (C) a protein that cannot carry out an enzyme reaction (D) a protein that generates a colored product that can be easily measured (E) a protein that carries nutrient molecules across membranes 19. An E. coli cell that has the genotype r'o z/ro z' would (A) repress B-galactosidase synthesis upon the addition of lactose (B) constitutively synthesize p-galactosidase (C) be unable to synthesize B-galactosidase (D) only induce B-galactosidase synthesis upon the addition of lactose (E) none of the aboveExplanation / Answer
14) The 5' cap of processed mRNA consist of 7 methyl guanosine triphosphate.
15) The rna polymerase is consist of 5 subunit which together is called holoenzyme.The holoenzyme helps in the initiation of transcription. Once the transcriprion is initiated the alpha subunit gets dissociated from the holoenzyme. The rna polymerase with 4 subunits called core enzyme continues the elongation of transcription. Hence the correct answer here is (a).
16)Barbara mcclintock discovered transposons.
17)the exonuclease activity of DNA polymerase1 in E.coli is to remove the nucleotide with mismatch bases.
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