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Statement I: ...

Question

Statement I: Antigens are the foreign substances that trigger immune response.
Statement II: Antibodies are the Y-shaped proteins that kill the antigens.

Choose the correct option.

A

Both the statements are incorrect.

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B

Both the statements are correct.

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C

Only statement I is correct.

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D

Only statement II is correct.

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Solution

The correct option is B Both the statements are correct.
Antigens are the foreign substances that can trigger immune response. For instance, pollens, microbes, etc. Antibodies are the Y-shaped proteins produced by the immune cells to destroy the antigens.

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Q. Antigens are the foreign substances that induce immune response.

Q. Read the following statements (A-D). How many of the following statements are correct regarding the immune response during vaccination?

A. Antigens are sensed as foreign substances by different antigen-presenting cells (APCs) like RBCs.
B. Antigen-presenting cells initiate immune response by engulfing the antigens and processing them.
C. A naive T cell identifies the antigen presented by macrophages and gets activated.
D. Upon activation by cytokines, the naive B cells divide to form memory B cells.

Q. Read the statements (A - D) related to secondary immune response and select the correct option. (T-true and F-false)

A. Secondary immune response is slow and long lived.
B. More antibodies are produced during secondary immune response compared to primary immune response.
C. Memory cells help in elevated immune response.
D. Secondary immune response occurs when the organism is exposed to a new antigen.

Q. Read the following assertion and reason statements and choose the correct option.

Assertion: Peyer’s patches of small intestine are considered secondary lymphoid organs.

Reason: The M cells of Peyer’s patches trap the antigens and allow the antibodies to bind to these to induce immunogenic response.

Q. Statement 1 - If any harmful bacteria enters our body, antigens and antibody acts on them and destroys them.
Statement 2 - More than

90 %

of our body are bacterial cells and most of them are good guys.
Does that mean that antigens and antibodies are bacterial cells?

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