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Splicing

Spliceosomes ...

Question

Spliceosomes can identify splicing areas in mRNA because they have

A

Complementary exons and introns

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B

SnRNPs

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C

Varied proteins

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D

None of the above

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Solution

The correct option is B SnRNPs
The snRNPs and other proteins together form the spliceosome, which is responsible for splicing of mRNA. It is however, the snRNPs that specifically help the spliceosomes identify the actual areas to be spliced on mRNA.

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Q. Spliceosomes can identify splicing areas in mRNA because they have

Q. Spliceosomes can identify splicing areas in hnRNA because they have

Q. Regarding the assertion and reason, select the correct option.

Assertion [A]: Spliceosomes edit mRNA.
Reasons [A]: Proteins in spliceosomes help in identifying the splicing sites in mRNA.

Q. Assertion (A): In eukaryotes, both introns and exons are transcribed to form hnRNA.

Reason (R): The exons are removed to make the final transcript by splicing.

Q. During splicing, the exons are joined and the enzyme which catalyzes this reaction is

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BIOLOGY

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Standard XII Biology

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