Questions about Chapter 2 1. The drug cytochalasin B blocks the function of acti

Question

Questions about Chapter 2 1. The drug cytochalasin B blocks the function of actin so that actin filaments cannot be made. Which of the following aspects of the cell cycle would be most disrupted by cytochalasin B? A) spindle formation B) spindle attachment to kinetochores C) DNA synthesis D) cell elongation during anaphase E) constriction of cell membrane and cytokinesis 2. In human and many other eukaryotic species' cells, the nuclear membrane has to disappear to permit A) cytokinesis B) the attachment of microtubules to kinetochores C) the splitting of the centrosomes D) the disassembly of the nucleolus E) all of the above 3. Some cells have several nuclei per cell. How could such multinucleated cells be explained? A) The cell underwent repeated cytokinesis but no karyokinesis B) The cell underwent repeated karyokinesis with simultaneous cytokinesis. C) The cell underwent repeated karyokinesis, but no cytokinesis. D) The cell underwent repeated S phases before it entered mitosis E) The cell underwent repeated synapsis but no karyokinesis. 4. At which phase are centrioles beginning to move apart in animal cells? A) telophase B) anaphase C) prometaphase D) metaphase E) prophase

Explanation / Answer

1.E.constriction of cell membrane and cytokinesis.

2.b.the attachment of microtubules to kinetochores.

3.C.

4 E.prophase

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