Final answer:
Organelles and large molecules are moved within a cell 3) through the cytoskeleton, using microtubule tracks and energy-dependent motor proteins for transport.
Step-by-step explanation:
Organelles and large molecules are moved within a cell primarily through the cytoskeleton. The cytoskeleton is a network of protein fibers including microfilaments, intermediate filaments, and microtubules. This matrix provides structural support and serves as a tracks for the transport of materials. For instance, vesicle transport involves vesicles moving along the cytoskeletal network to the plasma membrane, where they can release their contents through processes like endocytosis and exocytosis, both of which are active transport processes requiring energy. Notably, motor proteins such as dynein and kinesin utilize ATP to move vesicles and organelles along microtubule tracks within the cell. This process enables the cell to distribute molecules and organelles to their correct location, necessary for functions such as the secretion of proteins and cellular respiration.