Exam 2 version B Answer Key

Exam 2 version B Answer Key - Biol 302 Exam 2 Version B...

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Biol 302 Exam 2 Version B Answer Key Name ________________________ March 20, 2008 Last five digits of SSN ___________ Multiple choice (2 pts each) Questions 1-5 focus on gene expression in eukaryotic cells. Choose the correct answer for the next five questions from the list below. You may use an answer more than once. a. transcription b. translation c. export from the nucleus d. mRNA processing e. none of the above 1. This process occurs after transcription but prior to export from the nucleus. ___D_____ 2. Splicing and polyadenylation are both types of _____D_______. 3. This process requires poly A binding protein and the cap binding complex. ___C____ 4. Charged tRNAs, ribosomes and a mature mRNA transcript are required for ___B____. 5. Which process occurs exclusively in the cytosol? ____B_____ 6. Sigma factor is important for: a. splicing b. translation in eukaryotes c. translation in prokaryotes d. transcription initiation in eukaryotes e. transcription initiaion in prokaryotes 7. Alternative splicing refers to: a. a process that occurs occasionally in bacterial cells, whereby certain sequences of DNA are removed from the chromosome b. removal of amino acids from the N terminal end of a protein c. removal of amino acids from the middle of a protein d. the production of different proteins from the same RNA transcript by splicing of the transcript in different ways. e. none of the above 8. T or F. Select A for true and B for false: In eukaryotic cells, the 5’cap may be added to the transcript before transcription of the molecule is complete. __ true _____ 1
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9. Which of the following sequences is NOT important for splicing? a. sequences at the junction of exon1 and intron 1 b. sequences at the junction of intron 1 and exon 2 c. branch point A found in the intron d. none of the above 10. Please choose the correct sequence of events involved in the splicing of a transcript in eukaryotic cells: a. branch point A attacks the 5’ splice site the 3’ end of exon1 reacts with the 5’ end of exon 2 lariat is formed b. branch point A attacks the 5’splice site lariat is formed the 3’ end of exon1 reacts with the 5’ end of exon 2 and the 2 exons are joined together c. the 3’ end of exon1 reacts with the 5’ end of exon 2 lariat is formed the two exons are joined together d. none of the above 11. Which of the following correctly lists the sequence of events involved in translation initiation in eukaryotes: a. initiator tRNA binds to the small subunit small subunit of ribosome with the initiator tRNA binds at the 5’end of the mRNA and moves along mRNA until encounters the start codon large ribosomal subunit binds b. initiator tRNA binds to the large subunit large subunit of ribosome with the initiator tRNA binds to the start codon small ribosomal subunit binds c. small ribosomal subunit binds to AUG initiator tRNA binds to small subunit large ribosomal subunit binds d. initiator tRNA binds to the small subunit
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This note was uploaded on 04/17/2008 for the course BIOL 302 taught by Professor Connollyandkrizek during the Spring '08 term at South Carolina.

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Exam 2 version B Answer Key - Biol 302 Exam 2 Version B...

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