During cell division, which structure forms a dynamic network of protein cables that organizes chromosome movement?

Introduction / Context:
Cell division requires precise segregation of genetic material. A specialized, microtubule-based structure organizes and drives chromosome movement. Knowing the names and roles of related structures helps distinguish the components of mitosis and meiosis.

Given Data / Assumptions:

• The structure is a network of protein cables.
• It forms during cell division.
• Its role is to organize chromosome movement and segregation.

Concept / Approach:
The mitotic spindle is composed of microtubules and associated motor proteins. It arises from centrosomes (in many animal cells) and attaches to chromosomes via kinetochores. By polymerization/depolymerization and motor activity, it positions and separates sister chromatids to daughter cells.

Step-by-Step Solution:

Verification / Alternative check:
Fluorescent microscopy during mitosis shows bipolar spindle fibers attaching to kinetochores and pulling chromatids apart at anaphase.

Why Other Options Are Wrong:

Common Pitfalls:
Equating any mitotic structure with the spindle. The spindle is the complete bipolar microtubule array plus motors; asters and kinetochores are parts within this system.

Final Answer:
Spindle (mitotic spindle).