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Ch. 12 - Adaptive Immunity
Norman-McKay- Microbiology: Basic and Clinical Principles 2nd Edition
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoNorman-McKay 2nd EditionCh. 12 - Adaptive ImmunityProblema 9
Capitolo 8, Problema 9

Compare and contrast T-dependent and T-independent antigens.

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Start by defining what antigens are: molecules that elicit an immune response, specifically by activating B cells to produce antibodies.
Explain T-dependent antigens: these require the help of T helper cells to activate B cells. Typically, these are protein antigens that induce a strong, long-lasting immune response with memory cell formation.
Describe T-independent antigens: these can activate B cells without T cell help. Usually, they are polysaccharides or repeating epitopes that cross-link B cell receptors, leading to a faster but generally weaker immune response without memory cell formation.
Compare the immune responses: T-dependent antigens lead to class switching (e.g., from IgM to IgG), affinity maturation, and memory B cell generation, whereas T-independent antigens mainly produce IgM antibodies with limited class switching and no memory.
Summarize the biological significance: T-dependent responses are crucial for long-term immunity and vaccine effectiveness, while T-independent responses provide rapid defense against certain pathogens but lack lasting immunity.

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T-Dependent Antigens

T-dependent antigens require help from T helper cells to activate B cells. These antigens are typically proteins that induce a strong immune response, including class switching and memory B cell formation, leading to long-lasting immunity.
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T Dependent & T Independent Antigens

T-Independent Antigens

T-independent antigens can activate B cells without T cell assistance. Usually polysaccharides or repeating epitopes, they trigger a rapid but weaker immune response, mainly producing IgM antibodies without significant memory cell development.
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02:08
T Dependent & T Independent Antigens

Immune Response Differences

The main differences between T-dependent and T-independent responses lie in the involvement of T cells, antibody class switching, and memory formation. T-dependent responses are more robust and long-lasting, while T-independent responses are quicker but less durable.
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Intro to Immune Response Damage
Pratica correlata
Domanda del libro di testo

Choose the false statement about T cytotoxic cells.

a. They stimulate B cells

b. They destroy virus-infected cells

c. They destroy cancer cells

d. They are activated by MHC I bound to antigens on APCs

e. They mediate the cellular branch of adaptive immunity

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Domanda del libro di testo

Where do T cells undergo self-tolerance selection?

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Why are packed red blood cells not tissue typed? Select all that apply.

a. Red blood cells lack MHC II

b. Red blood cells lack MHC I

c. Red blood cells can’t stimulate an immune response

d. Red blood cells aren’t transferred to others

e. Red blood cells don’t make antibodies and therefore do not need to be typed

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Domanda del libro di testo

Which of the following is not a function of antibodies?

a. Opsonization

b. Activating complement proteins

c. Activating T helper cells

d. Enhancing phagocytosis

e. Antigen neutralization

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Domanda del libro di testo

Which of the following does not generate long-term immunological memory? Select all that apply.

a. Antivenom

b. Antitoxins

c. Vaccinations

d. Breast-feeding

e. Antigens

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Domanda del libro di testo

T helper cells activate B cells to become ________________, which make ________________.

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