Question
Chapter 16, Problem 1MC
Summary Introduction

Introduction:

Antibodies are Y shaped molecules which are called as immunoglobulins. They are secreted from B cells which are primed by foreign antigen molecules to release immunoglobulins.

Expert Solution & Answer
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Answer to Problem 1MC

Correct answer:

Antibodies function to mark invading organisms for destruction.

Therefore, option (b) is correct.

Option (b) is given as “mark invading organisms for destruction”.

Explanation of Solution

Justify reason for the correct statement:

Antibodies are immunoglobulin molecules which are released from the primed B cells after exposure to an antigen molecule. The antibodies attach to the microbes or infected and produce toxins to eradicate the microbes. The antibodies are adaptive immunity that can be memory cells, hence they prime the same antibodies to microbes that are already exposed to the antibodies.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “directly destroy foreign organ graft”.

When the organ is received from the donor, and MHC does not match, the recipient immune system destroys the organ from the donor. Hence, it is a wrong answer.

Option (c) is given as “kill intracellular viruses”.

Cytokines and interleukins are secreted from the infected cells which kill the viruses inside the body. Hence, it is a wrong answer.

Option (d) is given as “directly promote cytokine synthesis”.

The infection of cells with bacteria or virus strains initiates and promotes the synthesis of cytokines. Hence, it is a wrong answer.

Option (e) is given as “stimulate T cell growth”.

Secretion of interleukins promotes the growth and differentiation of T cell in the immune system of the body. Hence, it is a wrong answer.

Hence, options (a), (c), (d) and (e) are incorrect.

Conclusion

Antibodies function to kill and destroy the infection caused by the infecting strains of bacteria. The antibody binds to the invading pathogenic antigen and neutralizes its effect in the body.

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