EXAM 1-03ans

EXAM 1-03ans - Biol. 303 EXAM I 9/23/03 Name_ -This exam...

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Biol. 303 EXAM I 9/23/03 Name___________________________________ -------------------------------------------------------------------------------------------------------------- This exam consists of 40 multiple choice questions worth 2.5 points each. On the separate answer sheet , please fill-in the single best choice for each question. Please  remember to fill-in your student number on the answer sheet . Good luck! -------------------------------------------------------------------------------------------------------------- 1. Eukaryotic cells differ from prokaryotic cells in that 1. prokaryotes do not have DNA. 2. prokaryotes do not have a true nucleus. 3. only eukaryotic cells contain genetic material. 4. eukaryotes are usually smaller than prokaryotes. 2. A certain mammalian organism has a diploid number of chromosomes equal to 42. This organism has one pair of sex chromosomes. How many autosomes does a gamete from this organism have? 1. 42 2. 40 3. 21 4. 20 Use the following information for questions 3-5 : A diploid somatic cell from a rat has a total of 42 chromosomes. As in humans, sex chromosomes determine sex: XX in females and XY in males. 3. What is the total number of DNA molecules in a rat cell (nucleus) in G 2 ? 1. 21 2. 42 3. 84 4. 126 4. What is the total number of telomeres in a rat cell in G 2 ?
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1. 42 2. 84 3. 126 4. 168 5. What is the total number of centromeres in a polar body cell from a rat? 1. 21 2. 40 3. 42 4. 84 6. When a diploid eukaryotic cell undergoes proliferation, during which part of the cell cycle does the number of DNA molecules equal "2n" (where the diploid number = 2n)? 1. S 2. G2 3. G1. 4. none of the above. 7. An allele is 1. a type of cell. 2. a dominant trait. 3. a form of a gene. 4. an imaginary concept. 8. The figure below shows a chromosomal separation taking place. The letters stand for genes; capital and lowercase stand for different alleles. 2 n in this organism is 4. What process is shown?
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1. anaphase of mitosis 2. telophase of meiosis I 3. anaphase of meiosis I 4. anaphase of meiosis II 9. In each one of Mendel's dihybrid crosses, 1. partial dominance was not observed. 2. the phenotypes in the F 1 generation segregated in a 3:1 ratio. 3. two distinct phenotypes were observed in the F 1 generation. 4. the phenotypes in the F 2 generation segregated in a 3:1 ratio. 10.
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This note was uploaded on 03/10/2012 for the course CHEM 352 taught by Professor Gierasch during the Spring '12 term at UMBC.

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EXAM 1-03ans - Biol. 303 EXAM I 9/23/03 Name_ -This exam...

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