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Determine the correctness or otherwise of the following Assertion [a] and Reason [r].Assertion [a]. B cells secrete antibodies against a virus while cytotoxic T cells kill virus-infected cells.Reason [r]. B cells confer active immunity while cytotoxic T cells confer passive immunity.
  • a)
    [a] and [r] are true and [r] is the correct reason for [a]
  • b)
    [a] and [r] are true but [r] is not the correct reason for [a]
  • c)
    [a] is true but [r] is false
  • d)
    [a] false but [r] is true
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Determine the correctness or otherwise of the following Assertion [a] ...
Assertion [a]: B cells secrete antibodies against a virus while cytotoxic T cells kill virus-infected cells.
Reason [r]: B cells confer active immunity while cytotoxic T cells confer passive immunity.

The correct answer is option 'C' - [a] is true but [r] is false.

Explanation:
B cells and Antibody Production:
- B cells are a type of white blood cell involved in the adaptive immune response.
- When a B cell encounters a virus, it recognizes specific viral antigens on the surface of the virus.
- The B cell then undergoes activation and differentiation into plasma cells, which are specialized cells that secrete antibodies.
- Antibodies are proteins that bind specifically to the viral antigens and neutralize the virus by preventing it from infecting other cells.
- Therefore, it is correct to say that B cells secrete antibodies against a virus.

Cytotoxic T cells and Killing Virus-Infected Cells:
- Cytotoxic T cells, also known as CD8+ T cells, are another type of white blood cell involved in the adaptive immune response.
- Cytotoxic T cells recognize virus-infected cells by recognizing viral antigens presented on the surface of infected cells.
- Once activated, cytotoxic T cells release cytotoxic granules containing enzymes that can kill the infected cells.
- The enzymes induce apoptosis, a programmed cell death, in the virus-infected cells.
- Therefore, it is correct to say that cytotoxic T cells kill virus-infected cells.

Active and Passive Immunity:
- Active immunity refers to the immunity that is developed after exposure to a pathogen or vaccination.
- Active immunity is long-lasting and involves the production of memory B cells and memory T cells that can provide a rapid and specific response upon re-exposure to the pathogen.
- B cells and the production of antibodies are essential for active immunity because they can recognize and neutralize the pathogen.
- Passive immunity, on the other hand, refers to the transfer of pre-formed antibodies or immune cells from one individual to another.
- Passive immunity is temporary and does not involve the production of memory cells.
- Cytotoxic T cells do not confer passive immunity as they are not involved in the transfer of pre-formed antibodies or immune cells.

Conclusion:
Based on the above explanations, it can be concluded that Assertion [a] is true as B cells do secrete antibodies against a virus and cytotoxic T cells do kill virus-infected cells. However, Reason [r] is false as B cells confer active immunity, not passive immunity, and cytotoxic T cells do not confer passive immunity.
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Determine the correctness or otherwise of the following Assertion [a] and Reason [r].Assertion [a]. B cells secrete antibodies against a virus while cytotoxic T cells kill virus-infected cells.Reason [r]. B cells confer active immunity while cytotoxic T cells confer passive immunity.a)[a] and [r] are true and [r] is the correct reason for [a]b)[a] and [r] are true but [r] is not the correct reason for [a]c)[a] is true but [r] is falsed)[a] false but [r] is trueCorrect answer is option 'C'. Can you explain this answer?
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Determine the correctness or otherwise of the following Assertion [a] and Reason [r].Assertion [a]. B cells secrete antibodies against a virus while cytotoxic T cells kill virus-infected cells.Reason [r]. B cells confer active immunity while cytotoxic T cells confer passive immunity.a)[a] and [r] are true and [r] is the correct reason for [a]b)[a] and [r] are true but [r] is not the correct reason for [a]c)[a] is true but [r] is falsed)[a] false but [r] is trueCorrect answer is option 'C'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about Determine the correctness or otherwise of the following Assertion [a] and Reason [r].Assertion [a]. B cells secrete antibodies against a virus while cytotoxic T cells kill virus-infected cells.Reason [r]. B cells confer active immunity while cytotoxic T cells confer passive immunity.a)[a] and [r] are true and [r] is the correct reason for [a]b)[a] and [r] are true but [r] is not the correct reason for [a]c)[a] is true but [r] is falsed)[a] false but [r] is trueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Determine the correctness or otherwise of the following Assertion [a] and Reason [r].Assertion [a]. B cells secrete antibodies against a virus while cytotoxic T cells kill virus-infected cells.Reason [r]. B cells confer active immunity while cytotoxic T cells confer passive immunity.a)[a] and [r] are true and [r] is the correct reason for [a]b)[a] and [r] are true but [r] is not the correct reason for [a]c)[a] is true but [r] is falsed)[a] false but [r] is trueCorrect answer is option 'C'. Can you explain this answer?.
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