Question

T-cells interact with free antigens.

True

False

An autoimmune disease can develop when antibodies bind to self-antigens.

True

False

The antigen recognized by antigen presenting cells is the same antigen presented to activated T-cells.

True

False

Bee stings and peanut allergies are examples of Type IV – Delayed Cell mediated hypersensitivity.

True

False

Which of the following would not present antigens to a T-helper cell?

lymphocytes with antibody producing capability

cells that recognize MHC class I molecules

differentiated monocytes

cells with MHC class II molecules

What type of immunity is induced when administering Rhogam to avoid a Type II Hypersensitivity?

naturally acquired active immunity.

artificially acquired active immunity.

naturally acquired passive immunity.

artificially acquired passive immunity.

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Question 232 pts

Which of the following receptors is considered “non-specific”?

Group of answer choices

Toll-like receptors

pattern recognition receptors

NOD and Rig like receptors

all of the above

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Question 242 pts

Which of the following causes an excessive T-helper cell response?

Group of answer choices

Exotoxin

A-B toxin

Superantigen

Answer 1

1. T-cells interact with free antigens.

false, unlike b cells T cells cannot bind to free antigens. they bind to fragments of foreign protein present on surface of body cell.

2. An autoimmune disease can develop when antibodies bind to self-antigens.

True, in autoimmune disaese the antibodies are produced agaist self antigens and they harm self cells by causing inflammation and tissue injury.

3.The antigen recognized by antigen presenting cells is the same antigen presented to activated T-cells.

True, t cytotoxic cells and helper T cells activated when antigen presenting cells recognise antigen. mostly these antigen presenting cells are dendratic cells.

4. Bee stings and peanut allergies are examples of Type IV – Delayed Cell mediated hypersensitivity.

false, theseare not Delayed Cell mediated hypersensitivity as they show immediate swelling or redness. but these two are type I hypersensivity.

5. Which of the following would not present antigens to a T-helper cell?

1. lymphocytes with antibody producing capability
2. cells that recognize MHC class I molecules
3. differentiated monocytes
4. cells with MHC class II molecules

The answer is 4) cells with MHC class II molecules as cells with class II MHC present antigen to B cells not T cells. all other option present antigen to T helper cells.

7. What type of immunity is induced when administering Rhogam to avoid a Type II Hypersensitivity?

1. naturally acquired active immunity.
2. artificially acquired active immunity.
3. naturally acquired passive immunity.
4. artificially acquired passive immunity.

The answer is 2) artificially acquired active immunity as it artificially administrated in patiants body and it is active immunity as it made up of antiodies to antigen present on red blood cells.