ex3 vers1 biol61

ex3 vers1 biol61 - Biol 61 section 1 Midterm 3 Name ID d e...

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Biol 61 section 1 Midterm 3 4/8/05 Name__________________________________ ID#_______________________________ Multiple Choice Section: Read each question carefully and choose the best answer. 1. Translation would be possible in a cell lacking a. Ribosomes b. rRNA c. mRNA d. tRNA e. all of the above are required for translation 2. A eukaryotic mRNA is being translated. How was the translational initiation site selected? a. It is the only AUG b. It is the first codon in the mRNA (at the 3’ end) c. It is the first AUG from the 5’ end d. It is the first codon in the mRNA at the 5’ end e. None of the above/its not always the same 3. A mRNA has lost its polyA tail a. It will be transcribed, but less efficiently b. It will be translated, but less efficiently c. It will not be translated at all d. It will be repaired e. None of the above 4. You are given 2 mRNAs. One is 1200 bases long, the other is 900 bases long. You could conclude that a. The first codes for a protein of exactly 400 amino acids, the second for a protein of 300 amino acids b. The larger mRNA must code for a larger protein than that coded for by the smaller mRNA c. There is no way that these mRNAs are from the same gene d. The mRNAs will be translated the same amount and the cell will have equal amounts of the 2 encoded proteins e. None of the above are valid conclusions 5. The anticodon 5’GUC3’ a. Is on the mRNA b. Is on the DNA c. Is on the tRNA d. Will base pair with the rRNA e. More than one of the above 6. The anticodon 5’GUC3’ a. Will base pair with the codon 5’CAG3’ b. Will base pair with the codon 5’GUC3’ c. Will base pair with the codon 5’GAC3’ d. Will base pair with the codon 5’CUG3’ e. Is not used by cells 7. Cells have less than 40 distinct tRNAs, yet there are 61 possible codons. This is because a. Many codons are unused by cells and tRNAs are not needed for these b. Wobble allows tRNAs to bind to mismatched partners c. Many codons are used as stop codons and this alone explains why there are so few tRNAs d. Cells can alter tRNAs during the translation process so that they temporarily recognize rare codons e. None of the above are correct 8. In order to build an initiation complex for translation, you would need a. Both subunits of the ribosome b. All of the tRNAs c. Elongation factors d. GTP e. More than one of the above 9. The last thing that joins the translation complex before translation begins is a. An initiation factor b. ATP c. The small subunit of the ribosome d. The large subunit of the ribosome e. A free amino acid 10. A protein is being translated that must ultimately be inside the Golgi complex a. The mRNA will enter the Golgi and be translated there b. The protein will be made in the cytoplasm and moved into the Golgi after the protein is completed c. The mRNA will enter the rough Endoplasmic Reticulum and be translated by ribosomes there d. The growing polypeptide will be fed into a pore in the Golgi membrane, but will be made by a cytoplasmic
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This note was uploaded on 01/15/2011 for the course BIOL 61 taught by Professor Vierra during the Spring '08 term at Pacific.

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ex3 vers1 biol61 - Biol 61 section 1 Midterm 3 Name ID d e...

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