Which DOES NOT provide long term immunity?

Correct Answer: B

Rationale: Artificially acquired passive immunity (e.g., antibody injection) is short-term, unlike active immunity which generates memory.

Correct Answer: B

Rationale: Suppressor (regulatory) T cells dampen responses; no suppressor B cells , and termination occurs .

Correct Answer: A

Rationale: Plasma cells secrete antibodies; T cells and macrophages don't.

Correct Answer: D

Rationale: Lymph is primarily interstitial fluid that has entered lymphatic vessels, similar in composition but with fewer proteins than blood or serum.

Correct Answer: A

Rationale: The alternative complement pathway is nonspecific, unlike IgE binding or specific B-cell responses.