Microtubules are hollow tubes about 20 to 25 nanometers in diameter that function in cell movement and provide structure within the cell. These tubes consist of subunits, called heterodimers, composed of two closely rela... More »

Microtubules help chromosomes divide, combine with microfilaments to provide structure for a cell, and combine to form cilia and flagella that help cells move. Microtubules are either shrinking or growing, and they can s... More »

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The cytoskeleton is a network of protein fibers that provide the framework for cellular movement, shape, organelle movement and cell division. These protein fibers make up the microfilaments, intermediate filaments and m... More »

Centrioles are tiny cylindrical tubes found in animal cells, and their job is to help organize the structure of microtubules during cell division. Centrioles are located near the cell’s nucleus and are arranged in such a... More »

Dr. William H. Heidcamp, a professor in the Biology Department at Gustavus Adolphus College, explains that cell differentiation occurs when the structure and function of cells change within a certain period. The formatio... More »

As a result of cell adaptation, the function of the cell influences its shape and internal structure. This is visible in specialized cells such as red blood cells, sperm cells, muscle cells and nerve cells. More »

Egg cells have adaptations in formation, structure and genetic makeup that enable them to function. Egg cells have similar genetic composition to sperm, but their physical structure and initial formation are unique. More »