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The Y-shaped proteinaceous structure produced by the immune cells to defend our body against harmful bacteria and viruses are known as:
immunoglobulin
amino acids
collagen
haemoglobin
immunoglobulin
Immunoglobulins, commonly known as antibodies, are Y-shaped glycoprotein molecules produced by plasma cells (differentiated B-lymphocytes). They function as the primary components of the humoral immune response by identifying and neutralizing foreign pathogens like bacteria and viruses.
Immunoglobulins, commonly known as antibodies, are Y-shaped glycoprotein molecules produced by plasma cells (differentiated B-lymphocytes). They function as the primary components of the humoral immune response by identifying and neutralizing foreign pathogens like bacteria and viruses.
Think of an antibody as a 'Lock-and-Key' mechanism where the antibody is the lock that specifically matches the 'key' (antigen) found on the surface of an invader, effectively tagging them for removal by the body's security forces.
Y-shape = Y-munglobulin (Think of the Y shape as the signature of an immunoglobulin).
Antigen+AntibodyтЗМAntigen-Antibody┬аComplex
The Y-shaped structure consists of two identical heavy chains and two identical light chains linked by disulfide bonds. The tips of the 'Y' contain variable regions (VHтАЛ and VLтАЛ) that form the antigen-binding site, which specifically recognizes and binds to unique molecular patterns called epitopes on pathogens. This binding marks the pathogen for destruction by other immune components like phagocytes or the complement system.
Immunoglobulins belong to the class of proteins called globulins.
There are five major classes of human antibodies: IgG, IgM, IgA, IgD, and IgE.
They are produced by specialized B-cells called plasma cells.
The constant region of the antibody determines the class of immunoglobulin and its specific effector function.
High specificity for target antigens.
Essential for immunological memory during vaccination.
Can trigger hypersensitivity reactions (allergies) in overactive immune states.
Diagnostic testing (e.g., ELISA for pathogen detection).
Passive immunization therapies using monoclonal antibodies.
Option B (Amino acids) are the building blocks of proteins, not the complex structures themselves.
Option C (Collagen) is the most abundant structural protein in the body, providing tensile strength to connective tissues.
Option D (Haemoglobin) is an iron-containing oxygen-transport metalloprotein in red blood cells.
A is correct тАФ Immunoglobulin is the scientific term for the Y-shaped protein molecules (antibodies) produced by the immune system to recognize and neutralize specific pathogens.
Always differentiate between 'structural proteins' like collagen and 'functional/defensive proteins' like immunoglobulins when answering questions about protein roles in the human body.
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