Agricultural Microbiology Lectures
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Questions and Answers

Which of the following is true about adaptive immunity?

  • It involves nonspecific responses to pathogens
  • It is present before any exposure to pathogens
  • It consists of external barriers plus internal cellular and chemical defenses
  • It develops after exposure to specific pathogens (correct)

What is the function of dendritic cells in the immune system?

  • Stimulate development of adaptive immunity (correct)
  • Engulf and destroy pathogens
  • Produce antibodies
  • Kill parasites

Which blood cells are responsible for cell-mediated immunity?

  • Eosinophils
  • Neutrophils
  • T cells (correct)
  • Macrophages

What is the main function of natural killer cells in the immune system?

<p>Destroy target cells (C)</p> Signup and view all the answers

Which type of immunity involves defenses against any pathogen?

<p>Innate immunity (D)</p> Signup and view all the answers

What do Toll-like receptors (TLRs) on phagocytic cells do in the immune system?

<p>Recognize groups of pathogens (C)</p> Signup and view all the answers

What is the function of eosinophils in the immune system?

<p>Kill parasites (D)</p> Signup and view all the answers

Which blood cells are responsible for phagocytosis in the immune system?

<p>Monocytes (A)</p> Signup and view all the answers

What are the primary targets of neutrophils in the immune system?

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

What is the main function of platelets in the immune system?

<p>Blood clotting (A)</p> Signup and view all the answers

What is innate immunity effective from?

<p>The time of birth (A)</p> Signup and view all the answers

Which cells can carry out extracellular killing?

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

What is the function of antibodies in the immune response?

<p>Mark pathogens for destruction and/or phagocytosis (D)</p> Signup and view all the answers

What is the role of antigens in eliciting an immune response?

<p>They elicit a response from B or T cells (C)</p> Signup and view all the answers

Which cells mature in the thymus above the heart?

<p>T cells (A)</p> Signup and view all the answers

What is the main function of natural killer lymphocytes (NK cells)?

<p>Secrete toxin onto surface of viral infected cells (D)</p> Signup and view all the answers

What is phagocytosis?

<p>The process by which phagocytic cells engulf and digest pathogens or debris (C)</p> Signup and view all the answers

What do vaccines do?

<p>Stimulate the immune system to mount defenses against harmful pathogens (C)</p> Signup and view all the answers

What is active immunity?

<p>The development of immunity when memory cells form clones in response to an infection or immunization (A)</p> Signup and view all the answers

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