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bio057 - ular region of a chromosome and determine that 20...

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Unformatted text preview: ' ular region of a chromosome and determine that 20% 22. Ifyou weretochemically analyze ' finbasesinthissameregionwouldbecytosine. ofitsbaseswereadenine,flten a. 20% b. 40% . e.80% 23. In the first part of the Meselson—Stahl experiment, E.colt' cells that had been grown for many generations on "N medium were transferred to “N medium for one generation. The DNA was then extracted, and the resulting cesium chloride density gradient analysis for this part of their work disproved: a. the semiconservative model of DNA replication b. the conservative model of DNA replication c. the dispersive model of DNA replication d. both the semiconservative and conservative models of DNA replication _ both the dispersive and conservative models of DNA replication * 3%; . 2.3 .5? '24. In DNA replication, joins Okazaki fragments into a continuous strand. :1. DNA helicase ——- r® DNA ligasealt— c. DNA polymerase d. DNA primase e. DNA topoisomerase 25. Which "of the following statements concerning mutations is correct? a. forward mutations and reverse mutations occur at roughly the same rate ”kg forward mutations occur more frequently than reverse mutationsfik c. forward mutations occur less frequently than reverse mutations d. reverse mutations do not occur e. none of the above 26. The experiments of Crick and Brenner. using the mntagen proflavin, helped to establish what important principle? : a. the genetic code is degenerate r — b. the genetic code is almost, but not quite, universal c. introns are regions Spliced out of primary transcripts d. resistance arises from random mutation a codon is composed of three nucleotides}? a. one single base insertion b. one single base deletion c. a and b equally (1. one single base deletion and two single base insertions two single base deletions and two single base insertions x- Page 6 of 22 ...
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