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What Will Be Required to Maintain This Coordinate System Biology Question

 

I’m working on a biology question and need an explanation to help me study.

A purified centrosome is mixed with purified tubulin subunits and GTP in an artificial membrane-bound container. A coordinate system is formed. What will be required to maintain this coordinate system?

Group of answer choices

The addition of new tubulin subunits and GTP.

The addition of GTP and GDP.

The addition of GTP and a new centrosome.

The addition of new tubulin subunits, GTP, and a new centrosome.