19.1-Spencer

WRITE THE QUESTION TOO. 1. Their ability to divide so rapidly. Cancer Cells are able to divide at a rate of 60 to 70 times in their life spand which is why they are so hard to control. By the time you have stoped one set of them another set has already divided.

2. The two types of genes are Proto-oncogenes and Tumor- supressor genes. Proto-oncogenes code are for proteins and they promote the cell cycle as well as prevent apoptosis. Turmor-suppressor genes are the code for proteins that inhavit the cell cycle as well as promote apoptosis

3. The most common types of cancer are lung cancer, pancreas cancer, stomach cancer, esophogas cancer, and anny other organ cancer. Organs are the most common place that gets cancer.


 * Definitions**

Apoptosis- programed cell death involving a cascade of specific cellular events leading to death and destruction of the vell Cancer- large tumor whose nondifferentiated cells exhibited loss of contact inhibition, uncontrolled growth, and the ability to invade tissue and metastasize Telomers- the tip ofd the end of a chromosome Tumor- cells derived from a single mutated cell that has repeatedly undergone cell division; benign tumors remain at the site of orgin, and malignant tumors metasitasize Carcinogenis- the development of cacer over a period of time Angiogenesis- the process of the formation of new blood vessels Oncogenes- is when proto-oncogenes mutate, they become cancer-causing genes Growth Factor- is a singnal that activates a cell-signaling pathway, resulting in cell division Oncology- is the study of cancer Oncologist- a scientist that studies cancer Carinomas- are cancers of the epithelial tissues and adenocarcinomas are cancers of glandular epithelial cells Sarcomas- these are cancers that arise in muscles and connective tussue, such as bone and fibrous connective tissue Leukemias- are cancers of the blood Lymphomas- these are cancers of lymphatic tussue