Exam 1 2007

Exam 1 2007 - Name _ Student number_ Bio 50 Cell and...

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Name ___________________________ Student number___________________________ Bio 50 Cell and Molecular Biology Exam I February 21, 2007 1. Put your name on the front page and your student number on all pages. 2. Write all your answers in the space provided. Do not use the back of pages. 3. Make sure you have all 10 pages and 10 questions . 4. Be concise and direct. Complete sentences are not necessary. 5. Diagrams are encouraged. 6. You have 3 hours to complete this exam. 7. Good luck to you! Did you take your aminos today? Answer each of the questions succinctly. Put DQ (for dumb question) next to those questions that, well, are just dumb ( i.e the process described doesn’t really happen). (10 points total) Which amino acid(s) normally form disulfide bonds in the cell? What is the consequence on peptide chain(s) of forming disulfide bonds? List the names of two amino acids that are often phosphorylated in a cell. What specific chemical property of these amino acids enables them to be phosphorylated? Give the name of the amino acid that begins each polypeptide chain. How many different codons does this amino acid have? Give the name of the amino acid that ends each polymer. The large and small subunits of the ribosome come together and create three important, functional regions involved in translating the mRNA. List these three regions, and define the important process that occurs in each. 1.
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Student number___________________________ 2 What is the function of each of the following? Describe succinctly in the space provided. Make sure you document where in a cell you expect to find this term doing its important function. (2 points each, 10 points total) TBP: Calvin Cycle: snRNPs Amyloplast: TFIIH 2.
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Student number___________________________ 3 aMazing Membranes: Not coded directly by the genome, membrane constituents are harder to study in many ways than proteins. Yet, they form essential structures of any cell. They form barriers to diffusion, have significant differences in composition, and are constantly in flux. Answer the following questions on these amazing structures. (18 points total) a) Circle the following molecules that can diffuse freely across a lipid bilayer? (4 points total) Methionine, ATP, Ethanol, tRNAs, oxygen, phosphatidylethanolamine, pyruvate, homeodomain containing protein b) Name and draw the chemical structure of a lipid below. Describe the function of its key structural elements. Which part of the molecule functions as the great insulator of molecular permeability? (4 points) c) All membranes are not the same, and all regions of the same membrane are not even the same. What
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This note was uploaded on 04/07/2008 for the course BIOL 50 taught by Professor Wiesel during the Spring '08 term at Brown.

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Exam 1 2007 - Name _ Student number_ Bio 50 Cell and...

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