Question

The cytoskeleton is a dynamic structure with many roles, including all of the following EXCEPT:

a. It serves as an internal framework, organizing organelles within the cell.
b. It serves as a scaffold, providing structural support and maintaining cell shape.
c. It degrades ubiquitinated proteins to allow cell cycle progression.
d. It assists with cellular locomotion.
e. It assists in movement of materials within the cell.

Answer 1

The cytoskeleton does not have a role in degrading ubiquitinated proteins; that is the function of the proteasome. The cytoskeleton provides structural support, assists in cell movement, and aids in intracellular transport.

Step-by-step explanation:

The cytoskeleton is a vital component of eukaryotic cells, playing a key role in maintaining cell structure, enabling cell mobility, facilitating cell division, and supporting the transportation of substances. It is composed of microfilaments, intermediate filaments, and microtubules that form a dynamic, interconnected network.

Answering the student's question, all of the described roles of the cytoskeleton are correct except for one: 'It degrades ubiquitinated proteins to allow cell cycle progression.' This is not a function of the cytoskeleton. Instead, the degradation of ubiquitinated proteins is carried out by a complex called the proteasome, not the cytoskeleton. Therefore, option (c) is the exception and does not describe a function of the cytoskeleton.