BIOS_41_EXAM_THREE_2011_VERC_ANSWERS

BIOS_41_EXAM_THREE_2011_VERC_ANSWERS - BIOS 41: Bio Core I...

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BIOS 41: Bio Core I EXAM THREE – 6Apr2011 NAME _____________________________ There are 50 questions on the test, worth a total of 100 points. You should mark your answers on the test first and then transfer them to the scantron sheet (this minimizes erasures on the scantron sheet). Read each question carefully and mark answers using a No. 2 pencil. Please write the letter of this test version (right) on your answer sheet. 1. What phase of the cell cycle begins after a positive answer to the checkpoint question “ is the extracellular environment favorable ”? (a) G1 begins (b) S begins (c) G2 begins (d) M begins (e) Interphase begins 2. Which of the following describes the control of entry into M phase? (a) S-Cdk concentration controls the activity of M cyclin (b) M-cyclin concentration controls the activity of M-Cdk (c) M-Cdk concentration controls the concentration of M cyclin (d) S-cyclin activity controls the concentration of M-Cdk (e) M-cyclin activity controls the concentration of M-Cdk 3. After chromosome duplication, _____(1)___ hold sister chromatids together. As the cell enters M phase, the replicated chromosomes are coiled up by ___(2)___. Together, these proteins ensure proper chromosome ____(3)_____ during mitosis. (a) (1) condensins (2) cohesins (3) alignment (b) (1) cohesins (2) condensins (3) alignment (c) (1) condensins (2) cohesins (3) segregation (d) (1) cohesins (2) condensins (3) segregation 4. _____(1)____ microtubules link replicated chromosomes to the spindle poles, _____(2)____ microtubules from opposing spindle poles overlap midway between the two poles, and _____(3)____ microtubules are neither attached to other microtubules nor to chromosomes. (a) (1) kinetochore (2) aster (3) interpolar (b) (1) aster (2) interpolar (3) kinetochore (c) (1) aster (2) kinetochore (3) interpolar (d) (1) interpolar (2) kinetochore (3) aster (e) (1) kinetochore (2) interpolar (3) aster 5. Which one of the following statements about mitosis is INCORRECT. (a) The mitotic spindle is composed of microtubules attached to two spindle poles. (b) The contractile ring is composed of both actin and myosin filaments. (c) Each pair of sister chromatids separates to become two daughter chromosomes. (d) The centrosome duplicates during interphase and forms the two poles of the mitotic spindle in M phase. (e) Phosphodiester bonds in the DNA attach kinetochores to the centrosomes. VERSION C
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6. Which one of the following processes is NOT involved in separating sister chromatids during mitotic anaphase? (a) Chromosomes are pulled poleward. (b) Chromosomes are pushed poleward. (c) Poles are pushed apart. (d) Poles are pulled apart. (e) None of the above: all four processes are involved. 7.
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This note was uploaded on 10/03/2011 for the course BIOS 41 taught by Professor Sands during the Spring '08 term at Lehigh University .

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BIOS_41_EXAM_THREE_2011_VERC_ANSWERS - BIOS 41: Bio Core I...

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