Which cellular structure is a network of protein filaments that helps transport materials, maintains cell shape, and is involved in movement?

Which cellular structure is a network of protein filaments that helps transport materials, maintains cell shape, and is involved in movement?

• A. Cytoskeleton
• B. Centrioles
• C. Ribosome
• D. Endoplasmic Reticulum

Answer: (A)

The main idea is the cytoskeleton, a dynamic network of protein filaments inside the cell. This framework, made up of microfilaments, intermediate filaments, and microtubules, acts like a transportation system: motor proteins such as kinesin and dynein move cargos along microtubules, and myosin moves along actin filaments, helping shuttle vesicles and organelles to their destinations. At the same time, the filaments provide structural support that helps the cell maintain its shape and resist deformation. For movement, the cytoskeleton rearranges its components to push or pull the cell, form protrusions for locomotion, and power the beating of cilia or flagella in some cells. Centrioles are primarily organizers of spindle fibers during cell division, not a general transport network. The endoplasmic reticulum is a membrane-bound system involved in lipid and protein synthesis, not a filament framework. The cytoskeleton best fits all three roles—transport, shape, and movement.

The main idea is the cytoskeleton, a dynamic network of protein filaments inside the cell. This framework, made up of microfilaments, intermediate filaments, and microtubules, acts like a transportation system: motor proteins such as kinesin and dynein move cargos along microtubules, and myosin moves along actin filaments, helping shuttle vesicles and organelles to their destinations. At the same time, the filaments provide structural support that helps the cell maintain its shape and resist deformation. For movement, the cytoskeleton rearranges its components to push or pull the cell, form protrusions for locomotion, and power the beating of cilia or flagella in some cells. Centrioles are primarily organizers of spindle fibers during cell division, not a general transport network. The endoplasmic reticulum is a membrane-bound system involved in lipid and protein synthesis, not a filament framework. The cytoskeleton best fits all three roles—transport, shape, and movement.