58. Which of the following phrases accurately describes a factor that helps cell

Question

58. Which of the following phrases accurately describes a factor that helps cells maintain a large pool of

unpolymerized actin? (

A) preventing hydrolysis of ATP associated with actin

B) regulating proteins such as Arp2/Arp3 to limit actin polymerization

C) proteins that bundle actin filaments

D) anchoring actin to the plasma membrane via a covalent lipid attachment

E) a capping protein that limits polymerization at the (+) end of microfilaments

F) proteins that bind actin subunits liberated during disassembly and prevent exchange of ADP for

ATP

30.

longer present in the cell) are likely to have a lower concentration of unassembled actin in the cytoplasm

compared to cells with a functional thymosin gene.

Explanation / Answer

58. Which of the following phrases accurately describes a factor that helps cells maintain a large pool of

unpolymerized actin? (
circle all that apply)

A) preventing hydrolysis of ATP associated with actin

B) regulating proteins such as Arp2/Arp3 to limit actin polymerization

C) proteins that bundle actin filaments

D) anchoring actin to the plasma membrane via a covalent lipid attachment

E) a capping protein that limits polymerization at the (+) end of microfilaments

F) proteins that bind actin subunits liberated during disassembly and prevent exchange of ADP for

ATP

30.
True

Cells containing a null mutation in the gene encoding thymosin (the thymosin protein is no

longer present in the cell) are likely to have a lower concentration of unassembled actin in the cytoplasm

compared to cells with a functional thymosin gene.

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