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Antibodies Knowledge-Based Practice

Biology · Human Body & Physiology · Biology · Immune System

5 Biology practice questions on Antibodies. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which class of immunoglobulins is the most abundant in human serum and is uniquely capable of crossing the placenta to provide passive immunity to the fetus?

    • A) IgD
    • B) IgE
    • C) IgG
    • D) IgM
  2. 2.

    Which class of immunoglobulins is the first to be secreted in significant amounts during a primary immune response and predominantly circulates in the blood as a pentamer?

    • A) Immunoglobulin A (IgA)
    • B) Immunoglobulin M (IgM)
    • C) Immunoglobulin G (IgG)
    • D) Immunoglobulin E (IgE)
  3. 3.

    Which class of immunoglobulins provides localized defense at mucosal surfaces and represents the predominant antibody found in external secretions such as tears, saliva, and breast milk?

    • A) Immunoglobulin D (IgD)
    • B) Immunoglobulin E (IgE)
    • C) Immunoglobulin G (IgG)
    • D) Immunoglobulin A (IgA)
  4. 4.

    Which effector mechanism of antibodies involves coating the surface of a pathogen to mark it for enhanced recognition and engulfment by phagocytes?

    • A) Neutralization
    • B) Agglutination
    • C) Opsonization
    • D) Complement-mediated cell lysis
  5. 5.

    Which structural feature of an antibody molecule is directly responsible for its specific binding to a distinct antigenic epitope?

    • A) The constant regions of the two heavy chains
    • B) The variable regions of both the heavy and light chains
    • C) The disulfide bridges linking the two heavy chains
    • D) The crystallizable Fc stem region of the molecule

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