14. The 5-cap on a processed mRNA consists of phosphate (C) 8-oxoguanosine di (A

Question

14. The 5-cap on a processed mRNA consists of phosphate (C) 8-oxoguanosine di (A) N-formyl methionine (B) several adenosine nucleotides (D) 7-methyl-guanosine triphosphate (E) 5-methyl-adenosine-triphosphate 15. The E coli RNA polymeraseis involved in transcription initiation; whereas the of RNA polymerase is involved in elongation (B) core enzyme; holoenzyme (D) core enzyme; core enzyme (A) holoenzyme; core enzyme (C) holoenzyme; holoenzyme 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 (D) introns (A) transposons (B) inverted repeats (C) direct repeats (E) exons 17. The 3->5' exonuclease activity of DNA polymerase I in E. coli is responsible for (B) removal of nucleotides with mismatched bases (B) formation of a final phosphodiester bond between two DNA fragments (C) removal of introns (A) removal of the primer (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 l'o'z/TO'Z would (A) repress B-galactosidase synthesis upon the addition of lactose (B) constitutively synthesize B-galactosidase (C) be unable to synthesize B-galactosidase (D) only induce B-galactosidase synthesis upon the addition of lactose (E) none of the above 20, In the formation of an aminoacyl tRNA (A) the amino terminus of the amino acid is directly attached to the S' end of the tRNA (B) the carboxyl terminus of the amino acid is directly attached to the 5' end of the tRNA (C) the amino terminus of the amino acid is directly attached to the 3' end of the tRNA (D) the carboxyl terminus of the amino acid is directly attached to the 3' end of the tRNA (E) the side chain group of the amino acid is directly attached to the anticodon loop of the tRNA

Explanation / Answer

14 - The correct answer is option D that is 5'cap has 7-methylguanosine triphosphate.

15 - The Correct answer is option A that is initiation is done by holoenzyme and elongation is done by core enzyme because holoenzyme is involved in promoter recognition that is specific recognition and core enzyme binds to random sequence that will help in elongation.

16 - The correct answer is option A that is transposons.

17 - The correct answer is option B that is removal of nucleotide with mismatched base pairs because 3 to 5 activity is of proofreading activity.

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