Sec101mt08 - Biology 200 Section 101 Dr Chowrira Midterm Exam Total time 45 min 22 of Course Grade Last Name First Name Student(please print Answer

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Biology 200 Section 101 – Dr. Chowrira Midterm Exam – October 15, 2008 Total time: 45 min. 22% of Course Grade Last Name: ________________ First Name: ______________ Student #: _________ (please print) ______________________________________________________________________ Answer all questions on this exam paper . Use black or blue PEN only. You have 45 minutes to complete this exam. ________________________________________________________________________ Genetic Code U C second A position G U UUU--Phe UUC--Phe UUA--Leu UUG--Leu UCU--Ser UCC--Ser UCA--Ser UCG--Ser UAU--Tyr UAC--Tyr UAA--stop UAG--stop UGU--Cys UGC--Cys UGA--stop UGG--Trp U C A G 1 s t C CUU--Leu CUC--Leu CUA--Leu CUG--Leu CCU--Pro CCC--Pro CCA--Pro CCG--Pro CAU--His CAC--His CAA--Gln CAG--Gln CGU--Arg CGC--Arg CGA--Arg CGG--Arg U C A G 3 r d P o s i A AUU--Ile AUC--Ile AUA--Ile AUG--Met ACU--Thr ACC--Thr ACA--Thr ACU--Thr AAU--Asn AAC--Asn AAA--Lys AAG--Lys AGU--Ser AGC--Ser AGA--Arg AGG--Arg U C A G P o s i t i o n G GUU--Val GUC--Val GUA--Val GUG--Val GCU--Ala GCC--Ala GCA--Ala GCG--Ala GAU--Asp GAC--Asp GAA--Glu GAG--Glu GGU--Gly GGC--Gly GGA--Gly GGG--Gly U C A G t i o n Question 1 2 3 4 5 6 TOTAL Student Score Maximum Score 4 4 3 7 10 15 43
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Question 1 (4 points – 4 minutes) Name the type of microscope and the microscopy technique used/best suited for visualizing the following. For full credit justify your choice . ( answer in the space provided ):i) A cell in the process of mitosis (as shown below) _____ LM ______( 0.5 pts .) time = 0 min time = 79 min time = 250 min time = 279 min The same cell photographed at different times during mitosis Live cells (there by the process of mitosis) can only be visualized by LM. (1pt) The LM technique used is DIC – can tell because of the 3-D effect created (better contrast) (1pt.) ii) Integral membrane proteins Freeze Fracture/Freeze etch TEM ( 1 pt .) While membranes can be visualized by thin-section TEM, membrane proteins can only visulalized by achieving bilayer split using freeze fracture techniques. The integral proteins appear as bumps on the smooth leaflet of lipids. (1pt.) Question 2 (4 points – 5 minutes) a. Which one of the following organisms would you predict will have the highest proportion of unsaturated fatty acids in their membranes? (1pt.) a) bacteria from thermal hot springs b) cactus from New Mexico c) scorpions from Sahar desert d) fish from Antarctica e) humans
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b. The diagram below shows passive transport. i. How can you tell? (1 pt.) ii. What changes would you make to the diagram so that it illustrates active transport? (1pt.)
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This note was uploaded on 12/13/2011 for the course BIOLOGY 300 taught by Professor Asdf during the Spring '08 term at The University of British Columbia.

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Sec101mt08 - Biology 200 Section 101 Dr Chowrira Midterm Exam Total time 45 min 22 of Course Grade Last Name First Name Student(please print Answer

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