Exam 2 Key 2008

Exam 2 Key 2008 - Purdue ID KEY Biol 241 - Spring 2008...

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Unformatted text preview: Purdue ID KEY Biol 241 - Spring 2008 Midterm II 3/20/2008 Question 1 (10 points) Question 2 (10 points) Question 3 (10 points) Question 4 (10 points) Question 5 (8 points) Question 6 (10 points) Question 7 (10 points) Question 8 (12 points) Question 9 (6 points) Question 10 (4 points) Question 11 (10 points) Extra credit (10 points) Total Biol 241, Spring 2008 Midterm Exam II Purdue ID: 1 Question 1. Please draw the structures of these nitrogen bases (10 points) Adenine (2 points) Guanine (2 points) Thymine (2 points) Cytosine (2 points) Uracil (2 points) Biol 241, Spring 2008 Midterm Exam II Purdue ID: 2 Question 2. (10 points total, 1 point each) 1) Which of the following is likely to cause a decrease in gene expression A) The modification of histones by histone acetyltransferases (HATs). B) The binding of transcription factors to upstream enhancer elements. C) The modification of histones by histone deacetylases (HDACs). D) The phosphorylation of the carboxyl terminal domain of RNA polymerase II by TFIIH. 2) Consider the following reassociation kinectics curves, Which of the following statements is most likely incorrect A) The genome of A does not contain some highly repetitive DNA B) The genomes of A and B are both larger than the genome of E. coli C) The genome of A is larger than the genome of B D) The genome of B contains mostly unique sequences 3) Which of the following best describes the regulation of trp operon by trpR? A) Inducible; Negative control B) Inducible; Positive control C) Repressible; Negative control D) Repressible; Positive control 4) When a petite mutant mates with a normal yeast, the resulting diploid zygote exhibits the petite phenotype. After sporulation (meiosis), the haploid progeny are all petite. This pattern of inheritance describes A) Segregational petite B) Neutral petite C) Suppressive petite D) Dominant negative Biol 241, Spring 2008 Midterm Exam II Purdue ID: 3 5) The autonomous replicating sequences (ARS) are A) Localized to the chromosome ends to assist telomerase functions B) Recognized by origin recognition complex C) Located at the centromeres to assist spindle fibers capturing kinectochores D) Transposon-like micro-satellites 6) Which of the following is an example of base analog? A) Acridine orange B) Ethylmethane sulfonate C) 5-bromouracil D) Ethudium Bromide 7) The direct repeats found at both ends of transposons are A) Parts of the transposable elements B) Generated by staggered cuts of the target sequences during transposition C) Caused by slippage during DNA replication D) Responsible for the phenomenon of genetic anticipation 8) In Maize, the Ds element cannot mobilize in the absence of Ac element because A) The Ds element utilizes replicative (copy-and-paste) transposition B) The Ds element utilizes non-replicative (cut-and-paste) transposition C) The Ds element does not contain a functional transposase D) The Ds element uses RNA intermediate during transposition 9) The shell coiling of snail...
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Exam 2 Key 2008 - Purdue ID KEY Biol 241 - Spring 2008...

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