Question

Which of the following is not a function of a cytoskeleton in a cell?
A. Intracellular transport
B. Maintenance of cell shape and structure
C. Support of the organelles
D. Cell motility
E. None of these

Answer 1

The cytoskeleton is a network of fibres which form the eukaryotic and prokaryotic cells and the archaeans. The fibres in eukaryotic cells are made up of a complex mesh of motor protein and protein filaments.

Complete Answer:
Let us analyse the options and find the correct answer.
- Cytoskeleton is made up of microtubules which help in intracellular transport. They help in transporting vesicles between the organelles and the plasma membrane by providing mechanical support.
- The fibrous elements of cytoskeleton including the microtubules and the filaments are involved in maintenance of the cell shape. Microtubules are generally found in the interior of the cells and help in maintaining the cell shape by resisting the compressive forces.
- The cytoskeleton is also involved in providing support to the cell. It is made up of a network of protein fibres which support the cell shape and also help in anchoring the organelles within the cell.
- Cytoskeletons help the cell in remaining rigid, but they are also involved in cell movement and help in changing the shape when required. The various components of cytoskeleton help flagella, sperm, and cilia to move.

Thus, the correct option is E) None of the above.

Note: The different fibers of cytoskeleton are,
1. Microtubules - They are small, round tubes which are made of a protein called tubulin. They help in transportation of cellular materials.
2. Microfilaments - They are thread like proteins and they are made up of protein called actin. They help in cellular movements.
3. Intermediate filaments - They provide tensile strength to the cells and also facilitate the formation of neurofilaments and keratins