Exam 3, 03 - <"r_,. ~, BI0321 Exam 3 Fall 2003 Page 1 of 4...

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<"r_,. .. ~, BI0321 Exam 3 Fall 2003 Page 1 of 4 \".J I.Which of the following classes of molecule that form the cytoskeleton produce the strongest filaments? ~A.actin filaments B.microtubules C intcL1l"::Hliat«! [.i.lCllH(;.fits- 2.At wha't stage of mitosisare seen to start to condense? A.Anaphase B.Telophase <C)Prophase D.S phase 3.There are 5 types of histone proteins, called HI, H2, H3, H4 and H5 A.True "'B.False chromosomes ]PrY1AP 4.In eucaryotes, all genome is required expression A.True -B. False of the DNA in the for normal gene \ J 5.General transcription factors activate transcription in both procaryotes and eucaryotes ..A. True B.False gene -6.How many levels of chromatin there in eucaryotes? A.I B.2 -c.3 D.more than 3 packing are -7.RNA processing is a form of gene control ..A. True B.False ~8.Gender in Drosophilia embryos is defined by the genes sex-lethal, transformed and double-sex. Interplay between these gene products result in the formation of the same type of protein. How can this same type of protein define both sexes? -A.it depends on the amount of protein produced B.the protein is the product of regulated alternative splicing ~.the protein binds to other variable factors in cells of the germ line 9.Checkpoints controlled cyclin-cdk A.True ..B. False in the cell cycle are by binding of proteins to complexes \..J' -10.Which of the following classes of molecule that form the cytoskeleton has a cylindrical structure? A.actin filaments B.microtubules C.intermediate filaments -i1.Why does cyclin concentration rise and fall with the cell cycle but cdks do not? A.cyclins are degraded after the cyclin- cdk compl~x becomes active B.the production of cyclin mRNA is switched oh and off at different times in the celt cycle C.cyclins,but ~ot cdks, are inhibited by CAK . D.cdks,but not 2yclins,are inhibited by CAK \ 12.What role does the ARP complex play in cell movement? A.the c~plex ~cts ~ a ~ cleatiop si1e for ~bul~~mono ers in \he l~adi~g edge of t~e cell cort x -B.the complex acts as a nucleation site for actin monomers i~ the leading edge of the cell cortex C.the cO ~ lex.ac ; as a ~ ~clea'ion ~f~e for t ulln m nomer In the\tral~ng edge 0 the ce I cor~ x D.the complex acts as a nucleation site for actin monomers in the trailing edge of the cell cortex --I3.What is the connection between profilin and thymosin? -A.they regulate the polymerization of
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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 3, 03 - <"r_,. ~, BI0321 Exam 3 Fall 2003 Page 1 of 4...

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