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Microtubules are tube-like passages that carry substances through the cytoplasm of a cell. They are part of the cytoskeleton and play a key role in intracellular transport.
Yes
Semi-permeable. Permeable means things can pass through, so semi-permeable means only some things can pass through.
Cytoplasm carries food and water to the cells.
Proteins called motor proteins are responsible for moving substances through the cell body. These motor proteins can walk along structures called microtubules inside the cell and carry substances along with them to different parts of the cell.
Endocytosis is the process that uses transport vesicles to take in molecules for the cell. It requires energy in the form of ATP to carry out the engulfing of substances by the cell membrane and their transport into the cytoplasm.