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A : RNAi takes place in all eukaryotic o...

A : RNAi takes place in all eukaryotic organisms as a method of cellular defense.
R : Complementary dsRNA molecule binds to specific mRNA and prevents its translation (silencing).

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1 )

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C

If Assertion is true statement but Reason is false, then mark (3).

D

If both Assertion and Reason are false statements, then mark (4).

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: The assertion states that RNA interference (RNAi) occurs in all eukaryotic organisms as a method of cellular defense. - **Evaluation**: This statement is true. RNAi is a well-documented mechanism that serves as a defense against viruses and transposable elements in eukaryotic cells. 2. **Understanding the Reason (R)**: The reason provided states that a complementary double-stranded RNA (dsRNA) molecule binds to specific mRNA and prevents its translation (silencing). - **Evaluation**: This statement is also true. The process involves the binding of dsRNA to the target mRNA, which leads to the degradation of the mRNA or inhibition of its translation, effectively silencing the gene. 3. **Relationship Between Assertion and Reason**: Now, we need to determine if the reason justifies the assertion. - **Evaluation**: While both statements are true, the reason does not fully justify the assertion. The assertion speaks to the general occurrence of RNAi in all eukaryotes, while the reason describes a specific mechanism of action. Thus, the reason provides an example of how RNAi functions but does not explain why it is a defense mechanism in all eukaryotic organisms. 4. **Conclusion**: Both the assertion and reason are true, but the reason does not justify the assertion. Therefore, the correct answer is option B: both A and R are true, but R does not explain A.
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Which take place in all eukaryotic organisms as a method of cellular defense

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Knowledge Check

  • Assertion : RNAi takes place in all eukarytic organisms as method of cellular defence. Reason : complementary dsRNA molecule binds to specific mRBN and prevents its translation (silecing).

    A
    If both Asserition and Reason are true but the reason is the correct explaintion of the assertion.
    B
    If both Assertion and Reason are true buth the reason is not the correct explaination of the assertion
    C
    If Assertion and Reason in false
    D
    If both Assertion and Reason are false

  • Which of the following statements are correct regarding the process of RNA interference ? (i) RNAi has been used to prevent nematode infestation of tobacco plants . (ii) RNAi takes place in all eukaryotic organisms as a method of cellular defense. (iii) The method involves silencing of specific mRNA using a complementary dsDNA molecule that binds and prevents the translation of mRNA. (iv) using retrovirus vectors , nematode–specific genes were introduced into the host plant .

    A
    (i) and (ii)
    B
    (i) and ( ii)
    C
    (i) and (iii)
    D
    (ii) and (iv)

  • The process of RNA interference takes place in all eukaryotic organisms as a method of cellular defense which involves silencing of a specific mRNA by- A. Complementary dsRNA B. retroposons C. Single Stranded DNA D. Protein

    A
    A, B
    B
    B, C
    C
    A, B, C
    D
    A, B, C, D

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    The growing size of the human population is a cause of concern for all people. The rate of birth and death in a given population will determine its size. Reproduction is the process by which organisms increase their population. The process of sexual maturation for reproduction is gradual and takes place while general body growth is still going on. Some degree of sexual maturation does not necessarily mean that the mind or body is ready for sexual acts or for having and bringing up children. Various contraceptive devices are being used by human beings to control the size of population. Which contraceptive method changes the hormonal balance of the body?

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    Which method of cellular defense is common in all eukaryotic organisms?

    Select the correct options to fill up the blanks. (i) _____ enzyme is crucial for the immune system to function and its absence is caused by the deletion of a gene (ii) Insulin consists of _____ and _____ that are linked together by _____ (iii) Transgenic mice are being used to test the safety of the ____ (iv) _____ involves silencing of a specific mRNA due to a complementary dsRNA molecule that binds to and prevents translation of the mRNA

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