1 Circle all that are true Polymerization and depolymerizati

1. Circle all that are true. Polymerization and depolymerization of actin are essential for:

A. production of contractile forces in cells (ex. muscle cells)

B. movement of cilia and flagella

C. crawling movements of cells over surfaces

D. maintaining the shape of a red blood cell

2. What would happen to treadmilling of actin if you add phalloidin to a cell? Explain your answer.

Solution

Thanks for your question.
A.Actin and Myosin are protiens that have a variety of functions in the body. They are present in different cells of the body.
Production of contractile forces in the body (True)
The binding of actin facilitiates movements of muscle cells called myocytes.
B. Movement of cilia and flagella (True)
Cilia and flagella are projections from the cells which help in movement of substances
C. crawling movement of cells over surfaces (True)
This is seen in movements such as filopidea
D. maintaining the shape of red blood cell (True)
Actin is part of the cytoskeleton of the red blood cell and helps in maintaining its shape.