Which of the following is not a function of dendri

Question 1 of 5

Which of the following is not a function of dendritic cells?

A. Activating virgin T cells B. Recognizing molecular patterns of invaders C. Killing and presenting antigen to T cells D. Collecting antigens from the tissue

Correct Answer: C

Rationale: Dendritic cells activate T cells , recognize patterns , and collect antigens ; killing is more NK/CTL-specific.

Question 2 of 5

Lymphatic capillaries are able to receive cellular debris and foreign particles because

A. of the structure of their flaplike valves B. the fluid pressure is so great it forces this material into the capillaries C. lymphatic and cardiovascular capillaries are designed to receive this material D. of amoeboid motion of the foreign particles

Correct Answer: A

Rationale: Flaplike valves (overlapping endothelial cells) in lymphatic capillaries allow debris entry; pressure , dual design , and amoeboid motion don't explain this.

Question 3 of 5

Adaptive immune responses are slow to develop, taking days to weeks after exposure to reach their peak. However, these responses are more specific than innate responses, and also generate immunological memory. These latter features, which provide enhanced protection upon re-infection with the same pathogen, are the basis of:

A. Vaccines B. Antibiotics C. Systemic shock D. Complement activation

Correct Answer: A

Rationale: Vaccines exploit specificity and memory of adaptive immunity; antibiotics target bacteria, shock is a reaction, complement is innate.

Question 4 of 5

The alternative pathway of complement activation has an important role in innate immunity, due to its ability to greatly amplify the amount of C3b deposited onto the pathogen surface. This amplification occurs because:

A. The C3 convertase of the alternative pathway is much more active than those of the classical and lectin pathways B. The C3 convertase of the alternative pathway works as a soluble enzyme in the plasma C. C3b in the alternative convertase (C3bBb) generates more C3b , amplifying deposition D. The C3 convertase of the alternative pathway is more efficiently recruited to pathogen surfaces than the C3 convertases of the classical and lectin pathways

Correct Answer: C

Rationale: C3b in the alternative convertase (C3bBb) generates more C3b , amplifying deposition; activity , solubility , or regulation don't explain this.

Question 5 of 5

Hepatitis C is a virus that infects hepatocytes, which are non-immune cells of the liver. Currently, patients with chronic Hepatitis C infections are treated with repeated administration of type I interferon, predominantly interferon Î±. One aspect of this treatment that might aid the patient's immune system in clearing this virus infection is:

A. Up-regulation of MHC class I expression levels on hepatocytes B. Activation of macrophages to produce noxious compounds that might kill the virus C. Induction of an inflammatory response to promote neutrophil trafficking to the liver D. Production of TNF-Î± in response to type I interferon leading to vasodilation in the liver

Correct Answer: A

Rationale: Type I interferon boosts MHC I on hepatocytes , aiding CD8 T cells; macrophage action or inflammation are less direct.

Which of the following is not a function of dendritic cells?

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