bs161 final Exam Practice Questions and Answers

bs161 final Exam Practice Questions and Answers In messenger RNA, the protein-coding sequence is present in: Question options: exons. introns. exons and the poly(A) sequence. introns and the poly(A) sequence. - Correct Answer️️ -exons. Which process produces multiple proteins from the same primary transcript in the same cell? Question options: chromatin remodeling histone modification alternative splicing combinatorial control - Correct Answer️️ -alternative splicing Alternative splicing allows for: Question options: two or more different proteins to be made from a single processed mRNA. different polypeptides to be made from a single gene. multiple genes to be used to code for a single polypeptide chain. enhanced recognition of an mRNA by a ribosome. increased stability of a mature mRNA. - Correct Answer️️ -different polypeptides to be made from a single gene. RNA splicing provides an opportunity for regulating gene expression because: Question options: the same exons may be spliced together in different sequences to produce different proteins from the same primary transcript. methylation of the poly(A) tail controls how rapidly the primary transcript can be broken up and spliced back together again. the same introns may be spliced together in different sequences to produce different proteins from the same primary transcript. methylation of spliceosomes controls how rapidly primary transcripts are processed and sent to the cytoplasm. - Correct Answer️️ -the same exons may be spliced together in different sequences to produce different proteins from the same primary transcript. In both prokaryotic and eukaryotic gene expression, Question options: Introns are removed from genes before translation RNA must be transported out of the nucleus for translation One type of RNA corresponds to only one type of protein Transcription requires RNA polymerase binding to promoter regions - Correct Answer️️ -Transcription requires RNA polymerase binding to promoter regions In prokaryotes: (Select all correct answers.) Question options: translation of an mRNA cannot begin until transcription is completed. the primary RNA transcript needs a "cap" at the 5' end for the initiation of translation. the translation of mRNA can begin even before transcription is completed. the DNA is packaged into nucleoid. - Correct Answer️️ -the translation of mRNA can begin even before transcription is completed. the DNA is packaged into nucleoid. In prokaryotes, the AUG codon that starts translation is: Question options: the AUG nearest the 5' cap on the mRNA. adjacent to the 5' cap on the mRNA. at the 5' end of the mRNA. adjacent to a Shine-Dalgarno sequence. - Correct Answer️️ -adjacent to a Shine- Dalgarno sequence. What occurs in positive transcriptional regulation to result in transcription? (Hint: Is there a difference between a promoter and the activator binding site? See text book and notes if you are not sure.) Question options: The activator protein binds to the activator binding site The repressor protein binds to the activator binding site The repressor protein binds to the promoter region The activator protein binds to the promoter region - Correct Answer️️ -The activator protein binds to the activator binding sit