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Introns & Exons

The RNA synth...

Question

The RNA synthesized on DNA template in the nucleus differs from the mRNA in the cytoplasm in that it contains.

A

Segments transcribed form exons

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B

Segments transcribed form introns

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C

Uracil

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D

Thymine

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Solution

The correct option is B Segments transcribed form introns
RNA is sythesised using the DNA as template in the nucleus. However, before this RNA leaves the nucleus and enters the cytoplasm the 5' cap is removed from the mRNA and also the introns are removed (splicing) and a poly A tail is added. This is known as mRNA processing. So, the mRNA now contains only the exons. So, the correct answer is ' segments transcribed from introns'.

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Transcription

BIOLOGY

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Introns & Exons

Standard XII Biology

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