Biology 3593B Study Guide - Quiz Guide: Nuclear Membrane, Centrosome, Kinetochore
Document Summary
The centrosome determines the plane of cell division. It doubles during s phase and will determine the spindle orientation. Each chromosome can consist of two centrioles at right angles, which are hollow tubes formed by microtubules. The centrosomes move to opposite ends of the nuclear envelope during g2-to-m transition. Orientation determines the plane at which the cell will divide and the spatial relationship of the two new cells. A high concentration of tubular dimers surrounds the centrosomes. These proteins initiate formation of microtubules, which leads to formation of the spindle structure. Plant cell lack centrosome but have distinct microtubule organising centres. Prophase, during which cohesin disappears, except at the centromere and the chromatids become visible. Kinetochores, for movement, develop in the centromere regions. Centrosomes serve as the mitotic centre"s poles, with microtubules. Chromosomes, consisting of two chromatids attached to the kinetochore forming between the poles to make the spindle. Pro-metaphase, during which the nuclear envelope breaks down.
