Understanding Immunity and Immune Responses
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Questions and Answers

What is the main function of the immune system?

  • Protecting multicellular organisms (correct)
  • Neutralizing antibodies
  • Forming memory cells
  • Producing antigens

How are effector responses different from memory responses in the immune system?

  • Effector responses form memory cells
  • Effector responses eliminate invaders (correct)
  • Memory responses neutralize invaders
  • Memory responses are rapid

What is the role of memory cells in the immune system?

  • Remaining dormant until a second encounter with antigen (correct)
  • Recognizing self-components
  • Producing antibodies
  • Rapidly responding to new antigens

How does the immune system differentiate between foreign invaders and host cells?

<p>Based on molecular patterns (C)</p> Signup and view all the answers

What is the significance of plasma cells in the immune system?

<p>Producing antibodies for defense (D)</p> Signup and view all the answers

Which type of antigen binds specifically to antibodies?

<p>Haptens (B)</p> Signup and view all the answers

What is a characteristic of Heterophils antigens?

<p>Identical antigens in unrelated organisms (A)</p> Signup and view all the answers

Which of the following is an example of a Hapten?

<p>Benzylpenicillic acid (D)</p> Signup and view all the answers

What is the nature of Isoantigens?

<p>Blood group antigens (B)</p> Signup and view all the answers

Which type of antigen has a molecular weight of less than 10,000?

<p>Drug - Benzylpenicillic acid (D)</p> Signup and view all the answers

Why does a homopolymer polypeptide chain fail to induce an immune response?

<p>Due to its chemical composition and heterogeneity (A)</p> Signup and view all the answers

Which factor is NOT mentioned as influencing the Immunogenicity of an antigen?

<p>Molecular Weight (B)</p> Signup and view all the answers

What is the main characteristic of INNATE IMMUNITY as described in the text?

<p>Non-specificity (B)</p> Signup and view all the answers

Which type of immunity relies on humoral/circulating mechanisms?

<p>Adaptive Immunity (D)</p> Signup and view all the answers

What is the term used in the text to describe 'a state of unresponsiveness towards self antigens'?

<p>Immunotolerance (C)</p> Signup and view all the answers

Why do substances with a molecular weight around 100000 Daltons show the best immunogenicity?

<p>Their large size helps in identification and phagocytosis by APCs (B)</p> Signup and view all the answers

Why do synthetic lysine and glutamic acid co-polymers seem to be less immunogenic compared to when tyrosine is added?

<p>The addition of other amino acids increases complexity (C)</p> Signup and view all the answers

How do proteins like insulin and histone with low molecular weight fail to produce proper immunological responses?

<p>They lack hidden epitopes for immune response (D)</p> Signup and view all the answers

Why are antigens from related species less antigenic than those from unrelated species?

<p>They lack foreignness (A)</p> Signup and view all the answers

What role does antigen presentation to T helper cells through Antigen Presenting Cells (APCs) play in immune responses?

<p>It is crucial for both humoral and cell-mediated immune responses (B)</p> Signup and view all the answers

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