immunology final Flashcards


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1

Which cells are the first responders during acute inflammation?

Neutrophils

2

Toll-like receptors recognize:

PAMPs (conserved pathogen patterns), trigger innate activation

3

Which cell type releases histamine during allergic reactions?

Mast cells

4

Which complement protein is a major opsonin?

C3b

5

NK cells kill target cells that:

Lack MHC 1

6

Which molecule is an anaphylatoxin?

C5a

7

Interferon-α is primarly produced in response to:

Viruses

8

Defensins are:

Antimicrobial peptides

9

The oxidative burst in neutrophils requires:

NADPH oxidase

10

Which is a professional antigen-presenting cell?

Dendritic cell

11

Mannose-binding lectin activates which complement pathway?

Lectin

12

The major function of macrophages is:

Phagocytosis and cytokine release

13

Which cytokine activates macrophages?

IFN-γ

14

Which cell type produces type I interferons?

Virus-infected cells

15

Which receptor recognizes LPS on gram-negative bacteria?

TLR4

16

Which cells forms pus?

Neutrophils

17

C-reactive protein (CRP) promotes:

Opsonization

18

Which chemokine attracts neutrophils?

IL-8

19

Dendritic cells migrate to lymph nodes via:

Lymphatic vessels

20

Which complement pathway is antibody-dependent?

Classical

21

Which immune cells release major basic protein?

Eosinophils

22

Which organ filters bloodborne pathogens?

Spleen

23

Which cytokine causes septic shock?

TNF-α, due to massive vasodialation

24

Which cell bridges innate and adaptive immunity?

Dendritic cell

25

Which cell is most effective in killing helminths?

Eosinophils

26

Which innate cell presents antigen via MHC II?

Macrophages

27

What do PRRs (pattern recognition receptors) detect?

PAMPs (pathogen molecular patterns)

28

Which complement protein is most important for opsonization?

C3b

29

Which cells kill virally infected cells without prior sensitization?

NK cells

30

What triggers the alternative complement pathway?

Pathogen surfaces

31

Which molecule mediates leukocyte rolling?

Selectins

32

What is the main component of NETs (neutrophils extracellular traps)?

DNA

33

What is a pro-inflammatory cytokine?

IL-6

34

Acute phase proteins are produced by the:

Liver

35

Which innate cell presents lipid antigens on CD1 molecules?

Dendritic cells

36

IFN-γ is produced mainly by:

NK cells and T cells

37

Which cells release histamine in response to C3a and C5a?

Mast cells

38

Which phagocyte is long-lived?

Macrophage

39

Which cells produce antibodies?

B-cells that differentiate into Plasma cells

40

CD8+ T cells recognize antigen presented on:

MHC I

41

Which antibody is produced first in a primary response?

IgM

42

Which enzyme mediates V(D)J recombination:

RAG1/2

43

Which antibody class crosses the placenta?

IgG

44

T-cell maturation occurs in the:

Thymus

45

Class-switch recombination requires which enzyme?

AID

46

Th1 cells activate:

Macrophages

47

Th2 cells activate:

Eosinophils for parasites/allergies

48

IgA is most associated with:

Mucosal immunity

49

Which immunoglobulin is pentameric?

IgM

50

MHC II presents peptides from:

Extracellular proteins

51

Which cells activate naive T cells?

Dendritic cells

52

Which cytokine is key for Th17 differentiation?

IL-6

53

Regulatory T (Tregs) cells suppress immunity using:

IL-10 and TGF-β

54

Memory B cells allow for:

Faster and stronger response

55

Somatic hypermutation occurs in the:

Germinal center

56

Which molecule provides costimulation (secondary activation signal) to T-cells?

CD80/86

57

Affinity maturation increases:

Antibody binding strength

58

Anergy (T-cell unresponsiveness) results from

Lack of costimulation

59

Which cells kill virus-infected cells in adaptive immunity?

CD8+ T cells

60

Thymic positive selection ensures T cells:

Can bind self-MHC

61

Thymic negative selection eliminates T cells that:

Bind foreign antigens

62

Which cytokine is essential for T-cell proliferation?

IL-2

63

Which antibody neutralizes toxins?

IgG

64

CD4 binds to:

MHC II β2 domain

65

what is an epitope?

The specific part of antigen recognized by antibodies

66

Cross-presentation allows dendritic cells to present:

Extracellular antigens on MCH I

67

IL-4 promotes which antibody isotype?

IgE

68

CD28 on T cells binds to:

CD80 and CD86

69

Which antibody is associated with allergic reactions?

IgE

70

Naive B cells express:

IgM and IgD

71

Which cytokine drives Th1 differentiation?

IL-12

72

Th17 cells are important for defense against:

Extracellular bacteria and fungi

73

Which cells are essential for germinal center formation?

T follicular helper cells

74

Which processes require AID?

Class switch & somatic hypermutation

75

IgG is most effective in:

Neutralization and opsonization

76

What is clonal selection?

Expansion of lymphocytes that bind antigen

77

What cytokine activates CD8+ T cells?

IL-12

78

What is central tolerance?

Elimination of self-reactive lymphocytes in thymus/bone marrow

79

Which cell type kills cells via perforin and granzyme?

CD8+ T cells

80

What is required for T-cell activation?

Antigen + costimulation

81

What is peripheral tolerance?

control of self-reactive cells outside primary organs

82

which isotypes can activate complement?

IgM and IgG

83

what is the purpose of the thymus?

T-cell development

84

T-cell receptor recognizes:

Peptide-MHC complexes

85

Which antibody is dimeric in secretions?

IgA

86

Which T cells help activate B cells?

Tfh (follicular helper) cells

87

Which cytokine inhibits immune responses?

IL-10

88

Plasma cells primarily reside in the:

Spleen and lymph nodes

89

Type I hypersensitivity reactions are mediated by:

IgE

90

Anaphylaxis is an example of:

Type I

91

Type II hypersensitivity involves:

IgG/IgM binding to cell surfaces

92

Serum sickness is which type of hypersensitivity?

Type III

93

Contact dermatitis is mediated by:

T cells

94

Graves disease is caused by antibodies that:

Stimulate TSH receptors

95

Myasthenia gravis results from antibodies that:

Block acetylcholine receptors

96

Immune complexes deposit in tissues in which hypersensitivity?

Type III

97

Tuberculin skin testing is:

Type IV

98

Rheumatoid arthritis is mainly:

Type III and IV

99

Which hypersensitivity involves complement activation on cell membranes?

Type II

100

Lupus is primarliy associated with:

Immune complex deposition

101

Anti-dsDNA antibodies are found in:

Systemic lupus erythematosus

102

Hashimoto thyroiditis involves:

Antibody-mediated thyroid destruction

103

Goodpasture syndrome targets which tissues?

Kidney and lungs

104

Type IV hypersensitivity occurs after:

Days

105

Autoimmunity may result from:

Loss of self-tolerance

106

Celiac disease is caused by T-cell response to:

Gluten

107

Molecular mimicry occurs when:

Pathogen antigens resemble human proteins

108

Which cytokine drives chronic autoimmune inflammation?

TNF-α

109

Which hypersensitivity features wheals and flares?

Type I

110

Hemolytic transfusion reactions are:

Type II

111

Immune complex deposition in glomeruli indicates:

Type III

112

Multiple sclerosis affects the:

Myeline of CNS

113

Autoantibodies against intrinsic factor cause:

Pernicious anemia

114

Atopic asthma is mediated by:

IgE

115

Chronic transplant rejection is mediated by:

T-cells and macrophages

116

Which hypersensitivity is mediated ONLY by T cells?

Type IV hypersensitivity

117

Anti-CCP (cyclic citrullinated peptide) antibodies appear in:

Rheumatoid arthritis

118

What cell types drives Type IV hypersensitivity?

CD4+ T cells

119

Immune thromocytopenic purpura (ITP) is:

Type II

120

Asthma is associated with increased:

IgE

121

Guillain-Barre Syndrome (GBS) is triggered by:

Molecular mimicry

122

Autoimmune hemolytic anemia is mediated by:

Antibodies against RBCs

123

What mediates damage in Type III hypersensitivity?

Immune complexes

124

Epitope spreading refers to:

Broader autoreactive responses over time

125

Which hypersensitibity uses Fc receptors on macrophages?

Type II hypersensitivity

126

What drives granuloma formation?

Th1 cells

127

Which illness is associated with anti-histone antibodies?

Drug-induced lupus

128

Food allergies are:

Type I hypersensitivity

129

Autoimmune disease more common in women because of?

Hormonal and genetic factors

130

HLA-B27 is associated with:

Ankylosing spondylitis

131

PPD (purified protein derivative) test is a:

Type IV, tests for TB

132

Stevens-Johnson syndrome involves:

T-celll mediated cytotoxicity

133

In Type II hypersensitivity complement leads to:

Tolerance

134

Autoimmune disease often involve elevated:

IL-6

135

Pemphigus vulgaris involves antibodies against:

Desmosomes

136

Vasculitis in Type III hypersensitivity results from:

Immune complexes

137

Chronic autoimmune diseases often involve:

Macrophages and Th1 cells

138

Autoimmune diseases commonly involve:

Loss of self-tolerance

139

X-linked agammaglobulinemia involves failure of:

B-cell maturation

140

ADA (Adenosine Deaminase) deficiency leads to:

SCID (Severe Combined Immune Deficiency)

141

DiGeorge syndrome results from failure of:

Thymus

142

Chronic granulomatous disease is caused by defective:

NADPH oxidase

143

Complement C5-C9 deficiency leads to infections with:

Neisseria

144

Selective IgA deficiency cause:

Mucosal infections

145

Hyper-IgM syndrome results from failure of:

Class-switching

146

Wiskott-Aldrich syndrome includes:

Eczema infections thromocytopenia

147

SCID patients lack:

Both T and B cells

148

Splenectomy increases risk of infection by:

Encapsulated bacteria

149

HIV infects:

CD4+ T cells

150

Leukocyte adhesion deficiency affects:

Integrins

151

C3 deficiency increases susceptibility to:

Encapsulated bacteria

152

X-linked agammaglobulinemia (XLA) presents with:

Low all immunoglobulins

153

HIV reduces immunity by:

CD4 T-cell destruction

154

Ataxia-telangiectasia involves:

DNA repair defects

155

Chronic mucocutaneous candidiasis results from defective:

T-cell response

156

Job syndrome (Hyper-IgE) causes:

High Ige and eczema

157

Complement C1 inhibitor deficiency causes:

Hereditary angioedema

158

Neutropenia increases susceptibility to:

Bacterial infections

159

NK cell deficiency leads to:

Viral infections

160

Hyper-IgM syndrome is due to:

CD40L deficiency

161

SCID patients require:

Bone marrow transplant

162

People without a spleen lack:

Marginal zone B cells

163

HIV binds to:

CD4 and CCR5/CXCR4

164

Hyper-IgE syndrome results in impaired:

Neutrophil chemotaxis

165

Paroxysmal nocturnal hemoglobinuria results from:

Complement overactivation

166

Patients with MCH II deficiency lack:

CD4 T-cell activation

167

Chronic granulomatous disease leads to susceptibility to:

Catalase-positive bacteria

168

Complement deficiencies typically cause:

Recurrent infections

169

Live attenuated vaccines provide:

Strong lifelong immunity

170

Inactivated vaccines induce mainly:

Humoral immunity

171

Toxoid vaccines protect against:

Bacterial toxins

172

Conjugate vaccines link polysaccharides to :

Protein carriers

173

Which vaccine is live?

MMR (Measles, Mumps, Rubella)

174

Hyperacute transplant rejection is mediated by:

Performed antibodies

175

Acute graft rejection involves:

T-cells

176

Graft-versus-host disease occurs when:

Donor T cells attack host

177

Autografts come from:

Self

178

Calcineurin inhibitors block:

IL-2 production

179

Checkpoint inhibitors block:

PD-1/PD-L1 or CTLA-4

180

CAR-T therapy involves engineering:

T cells to target tumors

181

Tumor antigens are presented on:

MHC molecules

182

NK cells kill tumor cells by recognizing:

Low MHC I

183

Dendritic cell vaccines work by:

Presenting tumor antigens to T cells

184

Chronic transplant rejection is mediated by:

T cells and fibrosis

185

What cytokine stimulates NK cells?

IL-12

186

Monoclonal antibodies treat cancer by:

Targeting tumor antigens

187

PD-1 helps cancer cells by:

Inhibiting T cells

188

What molecule is commonly targeted in immunotherapy?

PD-L1

189

Tumor-infiltrating lymphocytes are:

T cells inside tumors

190

Cytokine-release syndrome in CAR-T therapy is due to:

Excess IL-6

191

CTLA-4 (cytotoxic T-Lymphocyte Antigen 4) inhibits:

T-cell activation

192

Hyperacute rejection occurs:

Minutes after transplantation

193

Cancer immune editing refers to:

Tumors mutating to escape immunity

194

what cells mediate ADCC (antibody-dependent cellular cytotoxicity)?

NK cells

195

Allografts come from:

Donors

196

Tumors escape immunity by:

Downregulating MHC I

197

Which vaccine requires booster shots?

Inactivated vaccines

198

Bispecific antibodies can:

bind two different antigens simultaneously

199

Which cytokine causes fever?

IL-1

200

The membrane attack complex is formed by which complement component?

C9

201

Which cell type releases histamine during allergic reactions?

Mast cells

202

Which cells kill tumor cells without prior sensitization?

NK cells

203

Tumor-specfic antigens are:

Uniquely expressed on tumor cells

204

Tumors evade immune detection by:

Secreting PD-L1

205

CD8 T cells recognized tumor cells through:

MHC I

206

Which is a checkpoint inhibitor?

Anti-PD-1 antibody

207

Tumor-associated antigens are:

normal proteins abnormally expressed

208

Which cells contribute to tumor immune suppression?

Tregs

209

CAR-T therapy involves engineering

T cells

210

Tumors evade surveillance by downregulating:

MHC I

211

Which cytokine enhances anti-tumor immunity?

IL-2

212

CTLA-4 functions to:

Suppress T cell activation

213

Tumor immunoediting phases include elimination, equilibrium, and:

Escape

214

ADCC occurs when:

NK cells recognize Fc of IgG

215

Tumor cells secreting VEGF cause:

Angiogenesis

216

Oncolytic viruses:

Kill tumor cells & stimulate immunity

217

Cold tumors are:

Low immune infiltration:

218

Tumor infiltrating lymphocytes are:

T cells in tumors

219

Tumors induce tolerance by:

Secreting IL-10 and TGF-β

220

Checkpoint blockade enhances:

T cell anti-tumor activity

221

Acute phase proteins are produced by the:

Liver