Consider the following statements about the immune system: 1. Macrophages are phagocytic cells. 2. B cells produce antibodies. 3. T cells are part of innate immunity. Which of the above is/are correct? MCQ with Answer and Explanation
Consider the following statements about the immune system:
1. Macrophages are phagocytic cells.
2. B cells produce antibodies.
3. T cells are part of innate immunity.
Which of the above is/are correct?
A. 1, 2, and 3
B. 1 and 2 only
C. 2 and 3 only
D. 1 and 3 only
Answer: Option B
Solution (By JKExamLibrary)
Macrophages phagocytose; B cells make antibodies. T cells are part of adaptive immunity, not innate. So 3 is incorrect.
Explanation:
Iodine solution (iodine in potassium iodide) gives a blue-black color with starch due to the formation of a polyiodide chain complex with amylose. Benedict's tests for reducing sugars, Biuret for proteins, Sudan III for lipids. The iodine test is specific and sensitive for starch.
Explanation:
Secretin, released from the duodenum in response to acidic chyme, stimulates the pancreas to secrete bicarbonate-rich fluid to neutralize the acid. Gastrin stimulates HCl, CCK enzyme secretion, motilin GI motility.
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