4th Exam, Bacteriology, 2017 Spring ID Name MULTIPLE CHOICE. Choose the one alte

Question

4th Exam, Bacteriology, 2017 Spring ID Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers 1) Which statement is NOT true about bacterial transcription? A) The chain growth by RNA polymerane is 3 to, which is opposie to that of DNA polymerase polymerase core enzyme does not include sigma factor C) RNA polymerase does not require a primer to initiate transcription D) The strand of DNA read by the RNA polymerase is sometimes called the non-coding strand E) Nucleotide substrates for transcription ane ribonucleoside triphosphates. 2) During which stage of bacterial transcription is the o (sigma) subunit of the RNA polymerase involved? A) conjugation B) elongation termination D) initiation E) splicing 3) Which of the following is the name of the three-base sequence in the mRNA that binds to a tRNA molecule? A) P site B) codon C) anticodon D) AUG binding site E) A site ) Which of the following is the amino acid that appears at the N-terminus of all newly translated prokaryotic polypeptides? A) tryptophan B) methionine C) selenocysteine D) glycine E) alanine 5) Which is found only in prokaryotes? A) coupled transcription and translation. B) polysomes C) ribosomes D) RNA polymerase E) silent mutations

Explanation / Answer

1. RNA polymerase are can only add Ribonucleisides in 5'-3' direction. Option A is false.

2. Sigma subunit is only required for intiation of transcription and after that it is deattached and enzyme is processed for elongation. Option D is correct.

3. mRNA have sequences called Codons and tRNA have complimentry sequences called anticodons. Option B is correct.

4. Methionine is the first aminoacid on the N terminus always. Option B is correct.

5. In prokaryotic organisms transcription and translation are coupled because mRNA is free of introns and not require processing. Option A is correct.

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