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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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 »

A centriole is a small cylindrical organelle in animal cells that employs materials to form centrosomes and cilia, the projections of the cells that are responsible for the body’s movement and sensory functions. During c... 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 »

Anton van Leeuwenhoek was the person who discovered cilia and flagella in 1676. The discovery was sent to the Royal Society of London in a letter that described his findings as a second sort of animalcules whose figures ... 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 »

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 »