Choose the correct statement concerning the Malpig

Question 1 of 5

Choose the correct statement concerning the Malpighian corpuscle:

A. It includes the basal & the prickle cell layers B. Its follicular arteriole is centeral in position C. It shown frequent mitotic figures D. Its follicular zone is formed mainly of B- lymphocytes

Correct Answer: D

Rationale: Malpighian corpuscle (white pulp) has a follicular zone with B-lymphocytes ; it's lymphoid, not epithelial , arteriole is central (B is misphrased), mitoses are in germinal centers .

Question 2 of 5

Why are MHC II molecules necessary for antigen presentation by APCs?

A. Because T cells only recognize presented antigens B. Because MHC II presents small fragments of proteins C. Because many pathogens reproduce in tissues or blood D. All of the above

Correct Answer: D

Rationale: MHC II is essential as T cells recognize peptide-MHC complexes , it presents fragments , and pathogens are extracellular ; all apply .

Question 3 of 5

Why is death by apoptosis a tidier way to die than via necrosis?

A. Apoptotic cells are destroyed by macrophages, preventing the release of cell contents into the tissues B. Necrotic cells are surrounded by a membrane, preventing the release of cell contents into the tissues C. Apoptotic cells release their contents into the tissues, causing inflammation and damage D.

Correct Answer: A

Rationale: Apoptosis is tidy as macrophages clear cells without leakage ; necrosis releases contents, causing inflammation (C is reversed).

Question 4 of 5

Select the statement that is true about the spleen

A. The spleen filters the lymph much the same way the lymph nodes filter the blood B. The spleen harbors eosinophils waiting for parasites to attack the body C. The spleen is the major site of red and white blood cell production in the adult D. The spleen filters the blood much the same way the lymph nodes filter the lymph

Correct Answer: D

Rationale: The spleen filters blood, not lymph ; lymph nodes filter lymph (A reversed), eosinophils aren't spleen-specific, and adult blood production is in bone marrow.

Question 5 of 5

Given the enormous heterogeneity of antigen receptors expressed on the populations of naive B and T lymphocytes, the adaptive immune response relies on a process whereby the rare lymphocyte that binds to the antigen is first induced to proliferate, before it can perform its effector function. For B cells, there is a clever mechanism that ensures that the specificity of the antibody secreted by the plasma cell will recognize the same pathogen that initially stimulated the B cell antigen receptor and induced B cell proliferation. This mechanism is:

A. Naive B cells express a single BCR, secreting the same antibody as plasma cells B. The naive B cell expresses a single specificity of B cell antigen receptor, and then up-regulates the expression of this receptor so it can bind tightly to the pathogen C. The plasma cell proliferates after it has finished secreting antibody to generate more plasma cells with specificity for the pathogen D. The plasma cell traps secreted antibody molecules in its extracellular matrix and uses these antibodies to bind to the pathogen

Correct Answer: A

Rationale: Naive B cells express a single BCR, secreting the same antibody as plasma cells ; multiple receptors , upregulation , or post-secretion proliferation don't occur.

Choose the correct statement concerning the Malpighian corpuscle:

Nurselytic

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