Chapter 17. The Three Phases of In Vitro G-Actin Polymerization

Animation Activities

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Animation Activity 17-07: The Three Phases of In Vitro G-Actin Polymerization

1.

The three phases of G-actin polymerization in the correct order are:

elongation, nucleation, steady state.

nucleation, elongation, steady state.

steady state, elongation, nucleation.

aggregation, nucleation, elongation.

nucleation, steady state, treadmilling.

Correct.

Incorrect.

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2.

The steady state phase of G-actin polymerization is when:

the (+) end of the filament grows at a consistently faster rate than the (–) end.

the (–) end of the filament depolymerizes at a consistently faster rate than the (+) end.

there is an equal concentration of free monomer actin molecules and polymerized actin.

there is no net change in the total length of the filaments.

All of the above.

Correct.

Incorrect.

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3.

As polymerization progresses, the mass of the actin filaments:

decreases and then eventually plateaus.

increases consistently.

stays constant.

increases and then eventually plateaus.

increases and then begins to decrease.

Correct.

Incorrect.

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4.

The rate of growth of actin filaments eventually stops increasing because:

there is no longer a net change in the total length of the filaments.

the G-actin concentration in the cell decreases.

the polymerization process enters the steady-state phase.

the (+) end of the filament polymerizes at the same rate that the (–) end depolymerizes.

All of the above.

Correct.

Incorrect.

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Chapter 17. The Three Phases of In Vitro G-Actin Polymerization

Introduction

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