CIE A Level Biology复习笔记11.1.2 Antigens
Antigens, Self & Non-Self Every cell in the human body has markers that identify it Microorganisms (both pathogenic and non-pathogenic), such as bacteria and viruses, also have their own unique...
CIE A Level Biology复习笔记11.1.1 Phagocytes
Phagocytes: Origin & Mode of Action Phagocytes are white blood cells that are produced continuously in the bone marrow They are stored in the bone marrow before being distributed around the bod...
CIE A Level Biology复习笔记10.2.3 Consequences of Antibiotic Resistance
Consequences of Antibiotic Resistance Consequences of antibiotic resistance Commonly prescribed antibiotics are becoming less effective for many reasons, the main being: Overuse of antibiotics and ...
CIE A Level Biology复习笔记10.2.2 Antibiotic Resistance
Resistance to Antibiotics: An Outline Within a bacterial population, there is variation caused by mutations (as occurs in populations of all species) A chance mutation might cause some bacteria to ...
CIE A Level Biology复习笔记10.2.1 Penicillin
Penicillin: Why it Affects Bacteria & Not Viruses Antibiotics are drugs that kill or stop the growth of bacteria (prokaryotes) but do not harm the cells of the infected organism Some antibiotic...
CIE A Level Biology复习笔记10.1.3 Prevention & Control of Disease
Factors for Prevention & Control of Common Diseases Prevention & control of cholera Cholera occurs when people do not have access to effective sanitation facilities and access to clean wate...
CIE A Level Biology复习笔记10.1.2 Transmission of Disease
Transmission of Common Diseases Transmission of cholera Cholera is caused by the bacterium Vibrio cholerae The disease is water-borne (the bacterium lives in water) and food-borne This means the di...
CIE A Level Biology复习笔记10.1.1 Infectious Diseases
Infectious Diseases A disease is an illness or disorder of the body or mind that leads to poor health Each disease is associated with a set of signs and symptoms Infectious diseases are caused by p...
CIE A Level Biology复习笔记9.1.6 Gas Exchange Processes
Gas Exchange Processes The exchange of oxygen and dioxide occurs between the alveoli and the capillaries in the lungs Oxygen and carbon dioxide are exchanged in a process of simple diffusion; (pass...
