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Interlude A
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Interlude B
Unit 3:
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Interlude C
Unit 4:
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Interlude E

Scientists Find a Key to Cell Division

Science, May 2004

A cellular structure discovered 125 years ago and dismissed by many biologists as "cellular garbage" has been found to play a key role in the process of cytokinesis, or cell division, one of the most ancient and important of all biological phenomena.

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Active Reading Questions

  1. The cell cycle represents the normal processes a cell goes through during its lifespan. During the cell cycle a cell may undergo _______________, which results in the division of its nuclear material and ________________, which results in the splitting of the parent cell into two distinct daughter cells.
    a) mitosis; cytokinesis
    b) cytokinesis; mitosis
    c) mitosis; meiosis
    d) meiosis; mitosis
  2. Cytokinesis in animal cells follows which of the following patterns?
    a) Vesicles containing cell wall components fuse and begin to form the cell wall down the midline of the dividing cell.
    b) Chromosomes align along the metaphase plate
    c) Actin microfilaments function to “pinch” the cell membrane into two compartments.
    d) Complete sets of daughter chromosomes are pulled to opposite poles.
  3. Describe a typical cell’s cycle of growth and division.
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