Arizona State University (ASU) BIO181 General Biology I Exam 1 Practice

During cytokinesis in plant cells, phragmoplast formation is the key process. This occurs after mitosis when the plant cell prepares to divide its cytoplasm. The phragmoplast is a structure composed of microtubules that guides the formation of the new cell wall. It facilitates the transport of vesicles containing cell wall materials to the center of the cell, where they fuse to form the new cell plate. As the cell plate expands and fuses with the existing cell membrane, it ultimately leads to the creation of two distinct daughter cells, each surrounded by its own cell wall.

This mechanism is specific to plant cells due to their rigid cell walls, which cannot simply pinch apart as in the cleavage furrow formation seen in animal cells. Thus, understanding phragmoplast formation is crucial for recognizing how plant cells complete cytokinesis effectively.