Biology : PU-CET (U.G) 2017 Panjab University Entrance Exam With Answers

Cytoplasmic streaming movements in a eukaryotic cell are due to the presence of D) Microfilaments.

Microfilaments are composed of actin protein and are part of the cytoskeleton of eukaryotic cells. They play a role in cell movement, division, and cytoplasmic streaming, which is the movement of the cytoplasm within a cell. In cytoplasmic streaming, the actin filaments form a network that pushes organelles and other cytoplasmic components around the cell in a coordinated manner.

Water, microtubules, and protofilaments do not play a direct role in cytoplasmic streaming movements.