antigens autoimmunity Autoimmunity is the failure of an organism to recognize its own constituent parts as self, which allows an immune response against its own cells and tissues. Benign tumor It is tumor that lacks all three of the malignant properties of a cancer. A benign tumor does not invade surrounding tissues and does not metastatise. Contact inhibition It is a natural process of arresting cell growth when two or more cells come into contact with each other. Innate immunity The innate immunity comprises of cells and mechanisms that defend the host in a manner interferon Thes are proteins made and released by the cells of most vertebrates in response to the presence of pathogens or tumor cells. They allow communication between cells to trigger the protective defences of the immune system that eradicate pathogens. Malignant tumor A group of cells which display uncontrolled growth , invasion and sometimes metastasis. Oncogenic virus An oncovirus is a virus that can cause cancer Passive immunity The immunity that is developed due to the transfer of ready made antibodies. Withdrawl syndrome A group of symptoms that occurs upon the abrupt discontinuation of dosage of drug or alcohol. ONE MARK QUESTIONS 1. Name the diagnostic test which confirms typhoid. 2. Name the two major groups of cells required to attain specific immunity. 3. Infectious diseases are more common than non-infectious diseases. Give reasoS 4. Do you agree with the statement that Auto-immunity causes some diseases? If so, name the diseases. 5. Breast fed babies are more immune to diseases than the bottle fed babies. Why? ANSWERS Widal test B-lymphocytes and T-lymphocytes.
antigens autoimmunity Autoimmunity is the failure of an organism to recognize its own constituent parts as self, which allows an immune response against its own cells and tissues. Benign tumor It is tumor that lacks all three of the malignant properties of a cancer. A benign tumor does not invade surrounding tissues and does not metastatise. Contact inhibition It is a natural process of arresting cell growth when two or more cells come into contact with each other. Innate immunity The innate immunity comprises of cells and mechanisms that defend the host in a manner interferon Thes are proteins made and released by the cells of most vertebrates in response to the presence of pathogens or tumor cells. They allow communication between cells to trigger the protective defences of the immune system that eradicate pathogens. Malignant tumor A group of cells which display uncontrolled growth , invasion and sometimes metastasis. Oncogenic virus An oncovirus is a virus that can cause cancer Passive immunity The immunity that is developed due to the transfer of ready made antibodies. Withdrawl syndrome A group of symptoms that occurs upon the abrupt discontinuation of dosage of drug or alcohol. ONE MARK QUESTIONS 1. Name the diagnostic test which confirms typhoid. 2. Name the two major groups of cells required to attain specific immunity. 3. Infectious diseases are more common than non-infectious diseases. Give reasoS 4. Do you agree with the statement that Auto-immunity causes some diseases? If so, name the diseases. 5. Breast fed babies are more immune to diseases than the bottle fed babies. Why? ANSWERS Widal test B-lymphocytes and T-lymphocytes.
1250565124study_material_of_class_xii_-biology,.docx