Question

During the formation of microfilaments, which of the following occurs?

a) ATP binds to G-actin
b) G-actin polymerizes, becoming F-actin
c) ATP hydrolysis is catalyzed by F-actin
d) Polymerization proceeds slowly at first, then becomes more rapid once a longer polymer has formed

Answer 1

During the formation of microfilaments, ATP binds to G-actin, which then polymerizes to form F-actin. Polymerization proceeds slowly at first, then becomes more rapid once a longer polymer has formed.

Step-by-step explanation:

The formation of microfilaments involves several processes. One of them is the binding of ATP to G-actin, which is the monomeric form of actin. G-actin then polymerizes to form F-actin, which is the filamentous form of actin. The polymerization proceeds slowly initially, but becomes more rapid once a longer polymer has formed.