MCAT Biology Question 107: Answer and Explanation
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Question: 107
2. Which of the following are NOT involved in cell-mediated immunity?
- A. Memory cells
- B. Plasma cells
- C. Cytotoxic cells
- D. Suppressor cells
Correct Answer: B
Explanation:
The lymphocytes involved in cell-mediated immunity are the T-lymphocytes, or T-cells. There are four types of T-cells, each playing a different role in cell-mediated immunity: cytotoxic T-cells, helper T-cells, memory T-cells, and suppressor T-cells. Thus, from the answer choices, the only cells not involved in cell-mediated immunity are the plasma cells, which are differentiated immunoglobulin-secreting B-lymphocytes involved in humoral immunity. Choice (B) is therefore the correct answer.