Exam%20III%202008%20KEY

Exam%20III%202008%20KEY - / PRINCIPLES OF GENETICS...

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_ / Instructions: 1. 2. 3. 4. PRINCIPLES OF GENETICS (BSCI222) Spring Semester, 2008 EXAMINATION III Name _ UID _ Lab Section Put your name on each page of the exam. Read each question carefully. Place aIl answers in the space provided. You have 50 minutes for this exam. GOODLUCKl Questions _ Bonus points _ Total Pts.
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------ Name . __ __ CIRCLE SINGLE BEST ANSWER ON LETTERS TO THE LEFT OF EACH QUES- TION! Each question is worth 4 points. ABC 1. When is the lactose operon likely to be transcribed? When: A. There is more glucose in the cell than lactose. B. There is more lactose in the cell than glucose. C. There is lactose but no glucose in the cell. D. The cyclic AMP levels are high within the cell. E. Both C and D are correct. 2. Imagine you've isolated a yeast mutant that contains histones resistant to acetylation. What phenotype do you predict for this mutant? A. The mutant will grow rapidly. B. The mutant will require extra acetyl groups for growth. C. The mutant will show reduced levels of gene expression. D. The mutant will show generally high levels of gene expression. E. The mutant will show increased levels of gene expression for only a few select genes. A E 3. Which of the following is crucial to production of human growth hormone in E. coli: A. E. coli has a rapid growth rate. B. E. coli is a prokaryote rather than a eukaryote C. The genetic code is universal. D . Human growth hormone is a small protein . E. Human growth hormone is similar in structure to E. coli proteins. D E 4. A particular triplet of bases in the templare sequence of DNA is 5'- TCA-3'. The anticodon component of the tRNA that binds to the rnRNA codon from this DNA is which of the following? Note: By convention, the 3' end of each anticodon is written on the left, 5' to the right. A. AGT. B. ACU. C. ACT. D. UGA. E. Either UGA or ACT, depending on wobble in the first base. 2
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A B D E AB C D E 5 . DNA methylation : A. Produces epistasis. B. Usually involves addition of methyl groups to thymine. e. causes DNA to unwind from histones. D. could change the way you respond to stress. E. affects a comparatively small number of cells in humans. 6. If aIl E. coli cells treated with plasmid DNA became transformed, what aspect of the standard cloning procedure would no longer be necessary? A. cDNAs would no longer be necessary B. Reverse transcriptase would no longer be needed for cDNA synthesis. C.
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This note was uploaded on 05/18/2008 for the course BSCI 222 taught by Professor Gdovin during the Spring '08 term at Maryland.

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Exam%20III%202008%20KEY - / PRINCIPLES OF GENETICS...

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