Bio200QandA - Bio200 Exam Instructor version 154 14.20...

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Unformatted text preview: Bio200 Exam Instructor version 154 14.20 Practice exam Questions for fun 1. If you know that a region of double-stranded DNA has a content of 60% G/C base pairs and 40% A/T base pairs, then what is the ratio of purines to pyrimidines in the DNA? a. 60:40 b. 40:60 c. 50:50 d. 20:80 e. cannot be determined from the above information 2. Interphase is a. the interval between lag phase and log phase b. the combination of G 1 , S, and G 2 c. the time that RNA polymerase terminates transcription d. the stage between prophase and metaphase e. the joining of the large and small ribosomal subunits 3. In a diploid cell in the metaphase of mitosis there are 100 chromatids. The haploid number of chromosomes for this organism would be: a. 200 b. 100 c. 50 d. 25 e. cannot accurately decide based on data given 4. Which of the following mutations would you expect to have the most disastrous effect on the roduct of a protein coding gene? a. A deletion of one base pair near the middle of the coding sequence b. A change of one A-T base pair near the end of the gene to a G-C base pair c. A deletion of three base pairs near the beginning of the gene d. A change of one G-C base pair near the beginning of the gene to an A-T base pair e. They would all be expected to have a similar effect. Bio200 Exam Instructor version 155 5. Which of the following double-stranded DNA molecules would require the most energy to be separated into single strands (assume all the DNAs have the same overall number of base pairs): a. one which contained 50% G-C base pairs b. one which contained 25% A-T base pairs c. one which contained all A on one strand and all T on the other strand d. one which contained all G on one strand and all C on the other strand e. all of the above would require the same amount of energy to be separated into single strands 6. Which is not an example of protein modification in eukaryotes? a. addition of a phosphate b. addition of a poly(A) tail c. addition of an iron atom d. removal of a signal peptide e. addition of an oligosaccharide 7. A mutation in the tumor suppressor gene p53 may promote cancer because such a mutation. a. Prevents DNA-repair. b. Increases the mutation rate. c. Promotes cell division. d. Does all of the above. 8. The following events occur in which sequence during the cell cycle: (1) DNA replication (2) Chromosome condensation (3) Accumulation of the SPF (4) DNA-repair (5) Segregation of sister chromatids (6) Nuclear membrane breakdown a. 1-4-2-6-5-3-4 b. 1-4-2-6-3-5-4 c. 1-2-4-6-5-3-4 d. 1-4-2-6-5-4-3 Bio200 Exam Instructor version 156 9. Which of the following cellular process would be inhibited by colchicine? 1) Cytokenesis. 2) Distribution of pigment in melanophores of fish....
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This note was uploaded on 12/13/2011 for the course BIOLOGY 300 taught by Professor Asdf during the Spring '08 term at The University of British Columbia.

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Bio200QandA - Bio200 Exam Instructor version 154 14.20...

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