Test3%20Sp07 pcb - PCB3134 - Test 3 Spring, 2007 YOU WILL...

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PCB3134 - Test 3 Spring, 2007 YOU WILL BE AWARDED 2 BONUS POINTS ON THE EXAM IF YOU FOLLOW THESE DIRECTIONS DIRECTIONS 1. Enter your name and UFID number on your answer sheet, BOTH PRINTED & FILL IN THE BUBBLES. 2. Enter the five-digit test code number in slots 76-80 of your answer sheet. The test code can be found at the bottom of each page on your test. IT IS IMPORTANT THAT THIS IS DONE CORRECTLY OR YOUR TEST CANNOT BE GRADED !!! 3. Answer each question with the ONE BEST answer. 4. Turn in your answer sheet when you have finished. 5. KEEP YOUR TEST SO THAT YOU WILL HAVE THE TEST CODE NUMBER. Grades will be posted by test code numbers. --------------------------------------------------------------------------------------------------------------------------------- READ EACH QUESTION CAREFULLY . Select the BEST ANSWER. If you do not understand the question, you may ask the instructor for clarification. --------------------------------------------------------------------------------------------------------------------------------- 1. When striated muscle is relaxed, myosin can not bind to the actin filaments because (1) troponin binds to myosin to block its binding to the actin filaments. (2) the phosphorylation of myosin is blocked in the absence of calcium by ATP bound to the small regulatory subunit of myosin. (3) calcium is bound to the myosin which prevents the myosin binding to that actin filaments. (4) calcium is bound to the myosin binding site on the actin filaments which blocks the binding of myosin. (5) tropomyosin covers the myosin binding site on the actin filaments. 2. Which of the following statements is INCORRECT for the processing of messenger RNA precursors in eukaryotes? (1) The 3' end of the mRNA precursor is usually cleaved from the precursor and then degraded. (2) The 5' end of the mRNA precursor is usually cleaved from the precursor and then degraded. (3) Many types of mRNAs are modified by methylation at the 2'-position of the ribose of the nucleotide at the 5'-end of the mRNA. (4) Most mRNA precursors are spliced to remove internal sequences of nucleotides from the precursors. 3. The return of rough endoplasmic reticulum proteins from the Golgi back to the rough endoplasmic reticulum depends on (1) the covalent attachment of the RER proteins to ubiquitin before transfer back to the RER. (2) the presence of mannose-6-phosphate receptors in the Golgi. (3) the formation of COPII (coat protein II) coated recycling vesicles in the Golgi. (4) the presence of a KDEL (lys-asp-glu-leu) amino acid sequence in the RER protein. (5) the binding of clathrin to Golgi membrane receptors to which RER proteins are bound. 4. Polymerization of microtubules begins in the centrosome (1) by formation of a ring of 9 tubulin heterodimers with the α -tubulins all oriented in the direction of elongation of the microtubule. (2) by binding the
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This test prep was uploaded on 04/20/2008 for the course PCB 3134 taught by Professor Multiple during the Spring '08 term at University of Florida.

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Test3%20Sp07 pcb - PCB3134 - Test 3 Spring, 2007 YOU WILL...

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