Question

Cyclosis is caused by the activity of
A. Microtubules
B. Microfilaments
C. Intermediate filaments
D. All of the above

Answer 1

Hint:The cell has various other organelles or filaments which are not the major part of the cell composition but maintain the stability of the cell, they are the cytoskeletal system components. They perform various functions to help the cell in motility and stability.

Complete answer: Cyclosis is the streaming of cytoplasm. Its cytoplasm has various organelles in it. They are motile in the way that they can float in the cytoplasm matrix. Thus they stream in the cell fluids.
Option A: Microtubules: Flagella is made of microtubules, an extension of the plasma membrane. They give the cell motility by whipping themselves. These filamentous structures are proteinaceous and found in bacteria mainly.
Option B: Microfilaments: They are present in the cytoplasm of the cell and thus help in the cyclosis process. They are the thin actin filaments forming a part of the cytoskeleton. When there is a fixed protein on the microfilament, the motor will move the organelles in the cytoplasm. It is a feature of the eukaryotic cell cytoplasm. They are thin up to 7nm in length. Intertwining strands of actin make the microfilaments.
Option C: Intermediate filaments: It is part of the cytoskeleton of the cell but has the major function of maintaining the stability of the plasma membrane and organelles.

So the answer is option B: Microfilaments.

Note: Microfilaments are 7 nm in size. They are very thin and narrow. They are made of actin protein. They are helical in shape and more flexible than microtubules. Actin is the most abundant cellular protein. It has the property to contractile.