Which of the following actually kills invading mic

ATI RN

ATI RN Test Bank

Which of the following actually kills invading microbes?

A. lysozymes B. stomach acid C. intestinal enzymes D. all of the above

Correct Answer: D

Rationale: Lysozymes degrade bacterial walls, stomach acid kills via pH, and intestinal enzymes digest microbes; all kill invaders.

Which of the following does not occur during the lag period of the primary antibody response?

A. activation of helper T cells B. class switching to IgG C. presentation of antigen with MHC II D. binding of antigen to BCRs

Correct Answer: B

Rationale: Class switching occurs later; activation , presentation , and binding happen in lag.

The ability of T-lymphocytes to recognize self from non-self antigens is developed in the

A. plasma cells B. spleen C. thymus D. liver

Correct Answer: C

Rationale: T cells gain self/non-self recognition during maturation in the thymus via positive and negative selection.

In an autoimmune disease, the immune response is directed toward

A. foreign antigens B. self-antigens C. antibodies D. viruses

Correct Answer: B

Rationale: Autoimmune diseases target self-antigens, causing immune attack on host tissues.

The lymphocytes which can develop immunocompetence in the thymus is

A. B lymphocytes B. T lymphocytes C. NK cells D. None of these

Correct Answer: B

Rationale: T lymphocytes mature and gain immunocompetence in the thymus.

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