Exam_2_Answers - BIOS 41: Bio Core I EXAM TWO 2Mar2011 NAME...

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BIOS 41: Bio Core I EXAM TWO – 2Mar2011 NAME _____________________________ There are 50 questions on the test, worth a total of 100 points. You should mark your answers on the test first and then transfer them to the scantron sheet (this minimizes erasures on the scantron sheet). Read each question carefully and mark answers using a No. 2 pencil. Please write the letter of this test version (right) on your answer sheet. 1. Assume that the piece of RNA below includes the site for the initiation of translation. Which amino acid will be on the tRNA that is the first to bind to the A-site of the ribosome? 5 -GCAUUGAUGUGGUUUGCG-3 (a) methionine (b) alanine (c) phenylalanine (d) lysine (e) tryptophan 2. Assume that the piece of RNA below includes the site for the initiation of translation. Which amino acid will be on the tRNA that is the second to bind to the A-site of the ribosome? 5 -GCAUUGAUGUGGUUUGCG-3 (a) methionine (b) alanine (c) phenylalanine (d) lysine (e) tryptophan 3. Assume that the piece of RNA below includes the site for the initiation of translation. Which amino acid will be on the tRNA that is the first to bind to the P-site of the ribosome? 5 -GCAUUGAUGUGGUUUGCG-3 (a) methionine (b) alanine (c) phenylalanine (d) lysine (e) tryptophan 4. Which of the following is an anticodon sequence (5’ to 3’) for tryptophanyl-tRNA? (a) 5’ C C A 3’ (b) 5’ A A A 3’ (c) 5’ U U A 3’ (d) 5’ A C C 3’ (e) 5’ A U U 3’ 5. Below is the sequence from the 3 end of an mRNA, including the stop codon. What is the anticodon on the tRNA in the P-site of the ribosome when release factor binds? 5 -UUUUGGUAAUUUCGGAAAAAAAAAAAA-3 (a) 5 -CCA-3 (b) 5 -CCG-3 (c) 5 -UGG-3 (d) 5 -UUU-3 (e) 5’-AAA-3’ VERSION A
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6. How many distinct aminoacyl-tRNA synthetases are there in most organisms? (a) four (b) twenty (c) thirty two (d) sixty one (e) sixty four 7. In eucaryotes, ribosomes find the start site of translation by ____________. (a) binding directly to a ribosome-binding site preceding the initiation codon (b) scanning along the mRNA from the 5 ′ end (c) directly recognizing an initiation codon as the start of translation (d) binding to an uncharged initiator tRNA (e) identifying the beginning of the first intron 8. Which of the following correctly describes the enzyme which forms peptide bonds? (a) it is a cytosolic protein with high affinity for ribosomes (b) it is a membrane protein with its active site protruding into the cytoplasm (c) it is a part of the large ribosomal subunit (d) it binds efficiently to the small ribosomal subunit (e) it is a cytosolic protein with a high affinity for charged tRNAs 9. Which one or more of the following lipids has a net negative charge? (a)
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This note was uploaded on 10/03/2011 for the course BIOS 41 taught by Professor Sands during the Spring '08 term at Lehigh University .

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Exam_2_Answers - BIOS 41: Bio Core I EXAM TWO 2Mar2011 NAME...

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