Exam III fall 05 - BI0321 Exam 3 Fall 2005 1. One reason...

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BI0321 Exam 3 Fall 2005 1. One reason that prokaryotic genes do not contain introns is that A. as prokaryotes do not have a nucleus, translation sometimes begins before transcription has been completed. B. integrated viral DNA is not recognized for transcription. C. the introns are cut out during binary fission. D. bacterial proteins are very short and not subject to mutation. E. due to the short time the bacterium is around as a single organism, a 5' cap and poly A tail are added immediately for translation to take place. . 2. Elongation of the microtubule occurs by the A. addition of G-actin subunits to the (+) end. B. addition of tubulin subunits to each end. C. addition of tubulin subunits to the (+) end. D. addition of the tubulin subunits to the (+) end, but removal from the (-) end. B. deletion of G-actin subunits from the (+) end. 3. During the G2 checkpoint in eukaryotic cells, the cell is assessed with regard to A. nutrients. B. chromosome attachment to the spindle. C. presence of growth factors. D. DNA damage. B. DNA replication. 4. Which of the following is NOT true of the main structural forms of actin? A. Actin filaments are severed to form filament bundles. B. Actin filaments may form a filament network (gel). C. Capped filaments are made from actin filaments. D. Actin filaments form filament bundles. B. Actin monomers may form actin filaments or G-actin protein complexes. 5. Kinesin is a motor molecule that is characterized by A. activation of sliding in flagellar microtubules. B. motion toward the "minus" end of the microtubule. C. sliding along actin in sarcomere. D. motion toward the "plus" end of the microtubule. B.motionalongactinfilaments. . 6. Which of the following is NOT a reason for the importance of mRNA processing in eukaryotes? A. turnover in the cytoplasm B. presence of a nuclear membrane C. removal of introns D. coupling of transcription and translation B. longevity in the cytoplasm 7. Amutationinwhichof thefollowingpartsof a geneis likelytobe mostdamagingtoa cell? A. 5'UTR . B. intron C. exon D. 3'UTR B. All would be equally damaging. 8. During splicing, which molecular component of the spliceosome catalyzes the excision reaction? A.protein B.sugar C.DNA D.RNA E.lipid 1
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BIO321 Exam 3 Fall 2006 9. The phase of the cell cycle associated with the doubling of the amount of DNA in the cell is A.02. B.S. -C. M. D.O1. E.oo. 10. The microtubule-organizing center (MTOC) A. serves as a site for microtubule and microfilament assembly. B. acts as an anchor for both ends of the microtubule. C. is positioned near the cell membrane. - D. is called a centrosome during interphase. E. is associated with two centrioles in plant cells. II. The nuclear membrane's role in the regulation of gene expression involves
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This note was uploaded on 02/05/2012 for the course BIOLOGY BIO 320/32 taught by Professor Dr.c during the Spring '11 term at Murray State KY.

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Exam III fall 05 - BI0321 Exam 3 Fall 2005 1. One reason...

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