In animal cells, the endogenously produced miRNAs silence gene expression by (A) base pairing with the 3'-untranslated region of specific mRNAs.

MicroRNAs (miRNAs) are small non-coding RNA molecules that function in RNA silencing and post-transcriptional regulation of gene expression. They work by binding to the 3'-untranslated region (3'-UTR) of specific messenger RNAs (mRNAs). This binding can inhibit the translation of the mRNA into a protein, effectively silencing the gene that the mRNA came from.

This process does not involve blocking mRNA synthesis (option B), as the mRNA has already been synthesized when the miRNA binds to it. It also does not involve binding to the operator site (option C), as this is a concept from prokaryotic gene regulation and does not apply to miRNAs in animal cells. Finally, miRNAs do not base pair with the 3' region of specific ribosomal RNAs (rRNAs) (option D), as their primary function is to regulate mRNAs, not rRNAs.

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In animal cells, the endogenously produced miRNAs silence gene expression by (A) base pairing with the 3'-untranslated region of specific mRNAs.

MicroRNAs (miRNAs) are small non-coding RNA molecules that function in RNA silencing and post-transcriptional regulation of gene expression. They work by binding to the 3'-untranslated region (3'-UTR) of specific messenger RNAs (mRNAs). This binding can inhibit the translation of the mRNA into a protein, effectively silencing the gene that the mRNA came from.

This process does not involve blocking mRNA synthesis (option B), as the mRNA has already been synthesized when the miRNA binds to it. It also does not involve binding to the operator site (option C), as this is a concept from prokaryotic gene regulation and does not apply to miRNAs in animal cells. Finally, miRNAs do not base pair with the 3' region of specific ribosomal RNAs (rRNAs) (option D), as their primary function is to regulate mRNAs, not rRNAs.

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In animal cells, the endogenously produced miRNAs silence gene expression by (A) base pairing with the 3'-untranslated region of specific mRNAs.

MicroRNAs (miRNAs) are small non-coding RNA molecules that function in RNA silencing and post-transcriptional regulation of gene expression. They work by binding to the 3'-untranslated region (3'-UTR) of specific messenger RNAs (mRNAs). This binding can inhibit the translation of the mRNA into a protein, effectively silencing the gene that the mRNA came from.

This process does not involve blocking mRNA synthesis (option B), as the mRNA has already been synthesized when the miRNA binds to it. It also does not involve binding to the operator site (option C), as this is a concept from prokaryotic gene regulation and does not apply to miRNAs in animal cells. Finally, miRNAs do not base pair with the 3' region of specific ribosomal RNAs (rRNAs) (option D), as their primary function is to regulate mRNAs, not rRNAs.

n animal cells, the endogenously produced miRNAs silence gene expression by(A) base pairing with the 3'-untranslated region of specific mRNAs(B) blocking mRNA synthesis(C) binding to the operator site(D) base pairing with the 3' region of specific rRNAs

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