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Final2004_AnswerKEY

Final2004_AnswerKEY - Last Name First Name Student Number...

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1 Last Name: ______________________________________ First Name: ____________________________ Student Number: _____________________ Biology 200 Final Exam Section 104, Instructor: Dr. Panté Dec. 10, 2004 1. Write all answers on the exam in PEN. Do not use pencil or red pen. 2. Write your name and student registration number on this exam AND on the Examination booklet. 3. You will have 2.5 hours to take this exam. This exam is worth 50% of the total term grade. 4. Please place your STUDENT CARD on your table. It will be checked during the exam. 5. Please return your ‘cheat sheet’. Question 1 2 3 4 5 6 7 8 9 10 11 12 TOTAL Student Score Max. Score 11 4 7 4 7 10 6 6 6 8 6 25 100 Answer Questions 1 to 5 on the exam. Question 1. Circle the correct answer on the exam. A. Proteins meant to remain resident within the rough endoplasmic reticulum are sometimes transported to the Golgi. They may be retrieved from the Golgi by: ( 2 marks ) a. COP1 - coated vesicles b. COP2 - coated vesicles c. Clathrin + adaptin - coated vesicles d. Medial vesicles e. Receptor mediated endocytosis B. If a kinetochore on one side of a metaphase chromosome is destroyed during metaphase, the chromosome would: ( 2 marks ) a. Stop in place b. Stop in the center of the cell c. Attach to another microtubule d. Move to the opposite pole e. Decondense C. As they emerge from the ribosome, signal sequences are recognized and bound by: ( 2 marks ) a. Signal peptidase b. Signal recognition particle c. tRNA d. Signal recognition particle receptor e. Small nuclear ribonucleoproteins (snRNPs) D. A mutant strain of yeast possesses a mutation in the nda2 gene, resulting in no production of alpha-tubulin. As a result, these cells would most likely: ( 2 marks ) a. Not duplicate their chromosomes b. Not enter G1 phase c. Not enter S phase d. Keep the nuclear membrane intact e. Have little or no spindle formation
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2 E. Below is a diagram of a small portion of a DNA molecule. What is the nucleotide sequence of the chain on the left? ( 3 marks ) a. 5'…GTCG…3' b. 5'…GCTC…3' c. 5'…CAGC…3' d. 5'…CGAC…3' Question 2. ( 4 marks ) Name one mechanism by which each of the following items could be imported into an animal cell. a) A bacterial cell: _________ PHAGOCYTOSIS ___________________________________ b) Glucose: _ PASSIVE TRANSPORT, GLUCOSE-Na+ SYMPORT ________ c) Cholesterol: ___ RECEPTOR MEDIATED ENDOCYTOSIS __________________ d) Na + ions: ____ DIFFUSION THROUGH ION CHANNELS Other possibility for d couple transporter for example with glucose. 1 mark each
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3 Question 3. ( 7 marks ) Chloroplasts, mitochondria, and nuclei are three intracellular organelles that are surrounded by two biological membranes. Although they posses some structural similarities, they have many differences in function and biogenesis. For statements 1 to 7 in the table below, indicate whether it applies to: A. Chloroplasts only B. Mitochondria only C. Nuclei only D. Both chloroplasts and mitochondria, but not nuclei E. All three organelles STATEMENT Fill letter A-E 1) These organelles contain remnant genomes carried on circular chromosomes which reflect their evolutionary origins.
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