Exam 1 Answers - BSC 1005 Exam 1: February 4, 2008 Page 1...

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BSC 1005 Exam 1: February 4, 2008 Page 1 Exam I: questions and answers The four versions had the same questions, but the order differed. I have indicated the correct answer and have explained some answers. 1) Mad cow disease is a degenerative neurodisease caused by a protein known as a prion. This disease is transferred to new hosts by: a. A virus that infects its victims. b. Water contaminated with fecal waste from infected individuals. c. Î Eating the flesh of infected individuals or animals. d. Breathing in small liquid droplets produced by victims when they sneeze. e. B and C are correct. 2) The octopus avoid predation largely by: a. Moving very fast. b. Producing and releasing toxic chemicals. c. Î Rapidly changing the patterns of color of its skin. d. Aggressively attaching enemies. e. Living in large groups or schools. 3) Dizygotic twins: a. Î Are as genetically dissimilar as they are to their other siblings. b. Develop from a single oocyte (egg) c. Share the same placenta in utero d. Both b & c are correct. e. None of the above are correct 4) Mendel showed that simple genetic traits: a. Are found on chromosomes. b. Are sorted independently in offspring. c. Involve the transfer of protein into daughter cells d. Can have multiple versions (alleles) e. Î B and D 5) Which of the following is NOT true about DNA a. It is composed of two strands. b. It is a polymer of amino acids. c. It contains complementary stands. d. DNA is composed of four bases (nucleotides) that are abbreviated A, U, G, and Y. e. Î B and D ( Because B was so obviously wrong, some may have picked it without reading further. Hence, I also accepted B alone and, to be fair, D alone). 6) Chromosome recombination is an aspect of sexual reproduction. It refers to the a. The genetic variability caused by the independent assortment of chromosomes during meiosis. b. Combination of gamete chromosomes to form a zygote. c. Î The exchange of regions between homologous chromosomes during meiosis. d. The unequal separation of genetic material between daughter cells during mitosis. e. Loss of genetic variability due to the loss of chromosomes during development. 7) In humans, most genes are on one of the 22 paired autosomes. A recessive allele (such as the mutation which causes Tay-Sachs disease) of such a gene is inherited in typical Mendelian fashion and can be predicted using a Punnet square. A child has to inherit the recessive allele from both its father and the mother to have the disease. Inheriting a single allele from just one parent makes the child a carrier, and usually the child will not show any signs of the disease. If both parents are carriers of Tay-Sachs disease, what is the likelihood that their child will be a carrier of the disease?
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Exam 1 Answers - BSC 1005 Exam 1: February 4, 2008 Page 1...

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