PracticeExam3 - Fall 2008 BIO 202 Practice Midterm Exam 3...

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Fall 2008 BIO 202 Practice Midterm Exam 3 P a ge 1 1) How are chromosomes separated from each other in bacteria during cell division? a) Mitosis b) Motor proteins c) Attachment to fixed points on the membrane of the growing cell d) Attachment to microtubules that slide past each other e) Helicases untwist the chromosomes to allow them to separate 2) All of the following occur during prometaphase of mitosis except : a) The nuclear envelope breaks down. b) The mitotic spindle invades the nucleus. c) Kinetochore fibers attach to chromosomes at the kinetochores. d) The chromosomes line up at the center of the cell. e) The spindle contains both kinetochore and non-kinetochore fibers. 3) What happens in metaphase of mitosis? a) Chromosomes line up in the center of the cell because equal forces pull toward each centrosome. b) Chromosomes line up in the center of the cell because equal forces push away from each centrosome. c) Chromosomes move away from the center of the cell. d) The nuclear envelope breaks down. e) Chromosomes first become attached to kinetochore fibers. 4) What is true of cytokinesis in animal cells but NOT plant cells? a) Each daughter cell gets a nucleus b) Vesicles line up at the cell plate and fuse c) Daughter cells have the same number of chromosomes as the original cell d) Cytokinesis can start before telophase finishes e) The cell divides when microfilaments form a cleavage furrow and pinch the cell in half 5) Many somatic eukaryotic cells can stop passing through the cell cycle, and remain for long periods in Go phase. What is true of these cells? a) They have the n number of chromosomes. b) The last phase of the cell cycle they were in before entering Go could have been S. c) The last phase of the cell cycle they were in before entering Go could have been G2. d) The last phase of the cell cycle they were in before entering Go could have been G1. e) They can contain pairs of sister chromatids. 6) What does PDGF do? a) Phosphorylates other proteins b) Triggers a signal transduction pathway c) Acts as a cyclin d) Stimulates blood clotting e) Orchestrates the events of mitosis 7) What is true of MPF? a) It triggers entry into mitosis b) It consists of 2 proteins bound to each other c) It contains a cyclin that is present at a high level throughout the cell cycle d) A and B ONLY e) A, B, and C are correct 8) MPF affects anaphase by a) Activating a protease that cleaves the proteins holding sister chromatids together b) Activating the motor proteins that move chromatids along microtubules c) Removing tubulin subunits from microtubules as they shorten d) Causing microtubules to slide past each other to lengthen the spindle e) Maintaining the connection between chromatids and microtubules
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Fall 2008 BIO 202 Practice Midterm Exam 3 P a ge 2 9) How do the two members of a pair of homologous chromosomes differ from each other? a) their length
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PracticeExam3 - Fall 2008 BIO 202 Practice Midterm Exam 3...

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