Centrioles and Centrosomes

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Centrioles are built from a cylindrical array of 9 microtubules, each of which has attached to it 2 partial microtubules.

The photo (courtesy of E. deHarven) is an electron micrograph showing a cross section of a centriole with its array of nine triplets of microtubules. The magnification is approximately 305,000.

When a cell enters the cell cycle and

Animal Tissues

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The development of a fertilized egg into a newborn child requires an average of 41 rounds of mitosis (241 = 2.2 x 1012). During this period, the cells produced by mitosis enter different pathways of differentiation; some becoming blood cells

Adipose Tissue

Two kinds of adipose tissue are found in mammals:

  • white adipose tissue (WAT) and
  • brown adipose tissue (BAT).

White adipose tissue is the most common and is the fat that so many of us complain of acquiring.

Brown adipose tissue is present in small mammals (e.g., mice) and in newborn humans. Most of it disappears in adult humans.

The cells in both types of fat are called adipocytes although they differ in origin, structure, and function in the two types of tissue.