AQA A Level Biology复习笔记2.5.9 Antigen-Antibody Complex
Antigen-Antibody Complex An antigen and its complementary antibody have complementary molecular shapes This means that their molecular structures fit into each other When an antibody ...
AQA A Level Biology复习笔记2.5.8 Antibodies
Antibodies: Structure Structure Antibodies are globular glycoproteins called immunoglobulins Antibodies have a quaternary structure (which is represented as Y-shaped), with two ‘heavy’ (long...
AQA A Level Biology复习笔记2.5.7 The B lymphocyte Response
The B lymphocyte Response B-lymphocytes and the humoral immune response B-lymphocytes (B cells) remain in the bone marrow until they are mature and then spread through the body, concentratin...
AQA A Level Biology复习笔记2.5.6 The Role of Helper T cells
The Role of Helper T cells Activated T-lymphocytes (those that have receptors specific to an antigen) divide by mitosis to increase in number (similar to the clonal selection and clonal expa...
AQA A Level Biology复习笔记2.5.5 The Role of Antigen-Presenting Cells
The Role of Antigen-Presenting Cells T-lymphocytes produce an immune response when they are exposed to a specific antigen T cells will only bind to an antigen if it is present on the surface...
AQA A Level Biology复习笔记2.5.4 The T Lymphocyte Response
The T Lymphocyte Response Lymphocytes are another type of white blood cell They play an important part in the specific immune response They are smaller than phagocytes They have a large nucl...
AQA A Level Biology复习笔记2.5.3 Phagocytosis
Phagocytosis 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 body in the blood They ...
AQA A Level Biology复习笔记2.5.2 Antigens
Antigens 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 markers These...
AQA A Level Biology复习笔记2.4.13 Factors Affecting Membrane Fluidity
Required Practical: Factors Affecting Membrane Permeability The permeability of cell membranes is affected by different factors or conditions, such as: Temperature Solvent concentration &nbs...
AQA A Level Biology复习笔记2.4.12 Specialised Cells
Explaining Adaptations in Specialised Cells Specialised cells for diffusion Root hair cells and epithelial cells of the small intestine are examples of cells that are adapted for the rapid t...
AQA A Level Biology复习笔记2.4.11 Adaptations for Rapid Transport
Adaptations for Rapid Transport The rate at which diffusion (including both simple diffusion and facilitated diffusion) occurs across external and internal cell membranes varies Some cells a...
2022斯坦福大学毕业生中，中国学生有多少？
斯坦福大学公布2022全校毕业生名单其中共有274名中国学生包括24名本科生、155名硕士生和95名博士生。2022斯坦福大学毕业生中，中国学生有多少？中国学生毕业于哪些学院/专业？ 本科毕业生：5人来自计算机专业 今...
