Test2%20Sp07 pcb - PCB3134 Test 2 Spring 2007 YOU WILL BE...

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PCB3134 - Test 2 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. Porins are proteins that (1) regulate the size of the annulus in plasmodesmata. (2) form the channels that cause the outer membrane of the mitochondria to be permeable to most small molecular weight solutes. (3) form the channels through which denatured proteins are transported out of the endoplasmic reticulum to be degraded in proteasomes. (4) create the membrane channel through which proteins are transferred through the membrane of the endoplasmic reticulum as the protein is being synthesized on ribosomes. (5) form the channels in gap junctions between the cytosols of adjacent cells. 2. The concentration of glucose into the epithelial cells of the intestines depends on (1) an ATP-dependent transport of glucose into the extracellular space of the animal body. (2) facilitated diffusion of glucose from the lumen of the intestines into the cell. (3) facilitated diffusion of glucose into the extracellular space of the animal body. (4) an ATP-dependent transport of glucose into the cell. (5) an ATP-dependent sodium/potassium transporter. 3. The primary function of tight junctions is to (1) form sites of attachment between the cells and the basement membrane. (2) provide sites through small molecular weight solutes may be transferred from the cytoplasm of one cell to the cytoplasm of the adjacent cell. (3) form sites of attachment between the cells and the extracellular matrix. (4) seal the extra cellular space between adjacent cells so that solutes cannot pass through the space between the cells. (5) create strong bond between adjacent cells to hold the cells an resist stresses that may separate the cells. 4. As a pair of electrons are transferred through the mitochondrial electron transport pathway, the best measurements indicate that there are 2 protons transferred across the membrane by (1) Complex IV. (2) Complex II. (3) Complex I. (4) Complex III.
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5. Steroid are synthesized in eukaryotic cells in the (1) rough endoplasmic reticulum.
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