Exam 2 version 1 - Name: PS ID#: BIOL 1362 - Introduction...

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V.1 N a m e : PS ID#: BIOL 1362 - Introduction to Biological Science – EXAM 2 Dr. Ana Medrano 03/11/09 MULTIPLE CHOICE (2points/ea) 1) The met + leu + bacteria that result from a cross between met + leu and met leu + bacteria are the result of: a) transformation. b) chance. c) mutation. d) genetic recombination. e) None of the above. 2) Which of the following is not an explanation for the high incidence of colon cancer? a) The cells giving rise to colon epithelial cells are continually dividing. b) The colon has millions of cells. c) Mutations are required only in a single oncogene and a single tumor suppressor gene. d) The cells are continually exposed to natural and synthetic carcinogens. e) All of the above are explanations for the high incidence of colon cancer. 3) A patient who is told that he has contracted a disease caused by an arbovirus most likely: a) can spread the disease to others. b) contracted the virus from food. c) had physical contact with an infected person. d) contracted the virus from an insect. e) contracted the virus from pet feces. 4) Nucleic acid hybridization: a) is used to study the relationship between eukaryotic genes and their transcripts. b) originally revealed the existence of introns. c) requires that the original DNA molecule be denatured. d) involves the use of a probe to form a double-stranded molecule. e) All of the above 5) The different members of the β -globin gene family: a) are expressed differently in different tissues. b) are expressed differently at different times of development. c) are expressed in the same way in different tissues. d) are expressed in the same way at different times of development. e) have no known function. 6) Expression vectors often have _______ promoters that respond to specific signals. a) complementary b) signal c) inducible d) recognition e) None of the above 7) Which of the following is not a feature of cancerous cells: a) responsive to inhibitory growth signals. b) hyperactive and increased response to growth factors. c) do not undergo programmed cell death (apoptosis). d) stimulate the growth of surrounding blood vessels. e) can grow forever if supplied nutrients. 8) Beginning with a single bacterium, how many cells would be present after four hours of growth if they can double every 20 minutes? a) 12 b) 24
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c) 64 d) 4,096 e) 34,217,728 9) Which of the following statements about TATA boxes is false ? a) They bind a specific transcription factor. b) They are found in the region of the promoter. c) They are part of the intron consensus sequence. d) They help specify the starting point for transcription. e) They contain thymine–adenine base pairs. 10) Nucleosomes disaggregate to allow transcription and then reaggregate a) through alternative splicing. b)
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Exam 2 version 1 - Name: PS ID#: BIOL 1362 - Introduction...

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