Question

Consider an individual microtubules that is in its shrinking phase. What must happen at the end of the microtubule in order for it to stop shrinking and start growing?

a. Enough GDP-loaded tubulin must be added quickly enough to cover up the GTP-containing subunits at the end of the microtubule end
b. Enough GTP-loaded tubulin must be added quickly enough to cover up the GDP-containing subunits at the end of the microtubule end
c. The GTP-loaded tubulin at the end of the microtubules must hydrolyze its GTP to GDP
d. The GDP-loaded tubulin at the end of the microtubules must become phosphorylated to convert the GDP to GTP
e. None of the above

Answer 1

In order for a microtubule to stop shrinking and start growing, enough GTP-loaded tubulin must be added quickly enough to cover the GDP-containing subunits at the end.

Step-by-step explanation:

In order for a microtubule in its shrinking phase to stop shrinking and start growing, enough GTP-loaded tubulin must be added quickly enough to cover up the GDP-containing subunits at the end of the microtubule.