Tag: diseases and immunity

Immunoglobulins, also known as antibodies, are glycoprotein molecules produced by plasma cells (white blood cells). They act as a critical part of the immune response by specifically recognising and binding to particular antigens, such as bacteria or viruses, and aiding in their destruction. So, the correct option is 'Glycoproteins'

Antibodies (also called immunoglobulins) are large proteins. They are found in the blood or other body fluids of vertebrates. Antibodies are the key element in the adaptive immune system. The antibody recognizes a unique part of the foreign target called an antigen. It is used by the immune system to neutralize pathogens such as pathogenic bacteria and viruses. Antibody is produced by plasma cells. Antibodies can occur in two physical forms, a soluble form that is secreted from the cell to be free in the blood plasma, and a membrane-bound form that is attached to the surface of a B cell and is referred to as the B-cell receptor (BCR). 

• Body's defence system produces antibodies.
  
• Antibodies are produced when an allergen or a foreign substance enters the human body by the immune system.
• It protects the body from unwanted foreign particles which enter the body.
• So, the correct answer is 'False'.

Mast cells are coated with IgE, which is produced by plasma cells (the antibody-producing cells of the immune system). IgE antibodies are typically specific to one particular antigen. In allergic reactions, mast cells remain inactive until an allergen binds to IgE already coated upon the cell.

Antibodies are the immunoglobulins which are produced in response to the antigen. The immunoglobulin E antibodies or IgE binds to an allergen and trigger the release of inflammatory chemicals such as histamine.
Therefore, the correct answer is option A.

Clone of B-cells is called as plasma cells which produce antibodies. Helper T-cells secrete IL-2 (interleukin-2) which stimulate B cells to produce antibodies. For example iInjection of snake antivenom against snake bite that provides artificially acquired passive immunity. Thus, the correct answer is option A.

An antibody is a type of proteinaceous substance produced by the body's immune system when it detects harmful substances called antigens. Examples of antigens include microorganisms (bacteria, fungi, parasites and viruses) and chemicals. Each type of antibody is unique and defends the body against one specific type of antigen.