Cytokinesis Original Scenario-Based Download PDF

Questions

1. 1.

   During an expedition into an ancient bio-dome, researchers discover a synthetic organism whose dividing cells are encased in a rigid cellulose wall. Microscopic analysis reveals that after telophase completes, cell division halts because the organism attempts to assemble an actin-myosin contractile ring to pinch the plasma membrane inward from the exterior margins. To allow these walled cells to successfully complete cytokinesis, the bio-engineers must reprogram the internal transport system to perform which process?

   • A) Fuse Golgi-derived vesicles along the equatorial plane to form a cell plate that expands outward toward the cell wall.
   • B) Dissolve the nuclear envelopes repeatedly so that microtubule asters can pull the plasma membrane inward.
   • C) Increase myosin motor activity along the cortex to overcome the mechanical stiffness of the outer cellulose matrix.
   • D) Anchor astral microtubules directly into the rigid cell wall to draw opposing sides together by depolymerization.