Biology
EdmondMonnier983
13

17. What is cyclin? 18. Define Cancer. What causes cancer? 19. What are stem cells and where do they come from?

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ESosa641

17. A family of proteins that control the progression of cells through the cell cycle by activating Cdk enzymes 18.  The disease caused by an uncontrolled division of abnormal cells in a part of the body. Gene mutations that occur after birth. Most gene mutations occur after you're born & arer not inherited. A number of things can cause gene mutations, such as smoking, radiation, viruses, cancer-causing chemicals (carcinogens), obesity, hormones, chronic inflammation& lack of exercise. 19.Definition of stem cells: is an undifferentiated cell of a multicellular organism that is able to give rise to indefinitely more cells of the same type& from which certain other kinds of cell arise by differentiation. They come from embryos that are three to five days old. 

jojo16

Cyclins are a family of proteins that control the progression of cells through cell cyclec by activating cyclin-dependent kinase (cdk) enzymes.

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