BIO 202 Spring 2000

BIO 202 Spring 2000 - 1 BIO 202 - EXAM 3 - SPRING 2000 1)...

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1 BIO 202 - EXAM 3 - SPRING 2000 1) Cells of eukaryotes (e.g. humans) are different from prokaryotic cells (e.g. bacteria) in which of the following ways? a) Eukaryotic chromosomes are circular, prokaryotic chromsomes are linear. b) Eukaryotic cells have a nucleus, prokaryotes do not have a nucleus. c) Eukaryotic cells divide more frequently than prokaryotic cells. d) All of the above. 2) During which phase of the cell cycle is DNA synthesized? a) G1 b) S c) G2 d) M 3) What happens to chromosomes during metaphase of mitosis? a) Sister chromatids separate and move towards opposite poles. b) The chromosomes condense and become cytologically visible. c) The chromosomes de-condense. d) The chromosomes convene at a point that is equidistant from the two spindle poles. 4) Which of the following is NOT involved in orchestrating the behavior of chromosomes during mitosis? a) Microtubules. b) Centrosomes. c) The nuclear envelope. d) The kinetochore (or centromere). 5) Experiments that involve fusing cells that are two different stages of the cell cycle provided evidence for cytoplasmic signals such as MPF (M-phase promoting factor) that regulate the progression through the cell cycle. In the experiment described in your textbook, a cell in M phase is fused with a cell in G1. The result of this fusion is: a) The nuclear envelope from the donor cell that was in M phase breaks down. b) The nuclear envelope from the donor cell that was in G1 breaks down. c) The chromosomes from the donor cell that was in M are replicated. d) The chromosomes from the donor cell that was in G1 are replicated.
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2 6) MPF triggers the transition from the G2 to M phases of the cell cycle. The increase in MPF activity at this stage of the cell cycle is due to: a) an increase in the abundance of cyclins. b) an increase in the abundance of CDKs (cyclin-dependent kinases). c) the breakdown of the nuclear envelope. d) the alignment of sister chromatids on the metaphase plate. 7) The loss of normal cell cycle control is central to the uncontrolled growth of cancer cells. One example of this is the loss of 'density-dependent inhibition' of cell division of cells in culture. What is 'density-dependent inhibition'? a) The inhibition of cell growth due to the density of mitochondria. b) The inhibition of cell growth due to the density of ribosomes in the cytoplasm. c) The inhibition of cell growth due to the relative densities of chromosomes and ribosomes. d) The inhibition of cell growth due to contact with other cells. 8) The actual division of the cytoplasm and nuclei of a dividing cell into two daughter cells is called…. a) cytokinesis. b) centrosome splitting c) anaphase promotion d) cytometastasis 9) A key difference between mitosis and meiosis is that: a) there are 2 rounds of chromosome duplication in meiosis, whereas there is only one round of chromosome duplication in mitosis. b) homologous chromosomes pair and separate during meiosis but not during mitosis.
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This note was uploaded on 10/28/2011 for the course BIO 202 taught by Professor Dean during the Spring '08 term at SUNY Stony Brook.

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BIO 202 Spring 2000 - 1 BIO 202 - EXAM 3 - SPRING 2000 1)...

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