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Question

Intron is a
a. functional sequence
b. non-coding sequence
c. characteristic of prokaryotic genome
d. characteristic of eukaryotic genome


A
b, d
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B
a, b, c, d
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C
b, c, d
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D
a, b, c
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Solution

The correct option is D b, d
Intron is noncoding sequence of an RNA transcript or a non-coding sequence of DNA. It is present only in eukaryotic genome and not in prokaryotes.

Exon is a coding sequence of DNA or the corresponding sequence in RNA transcript present in both eukaryotes and prokaryotes.

Gene is a functional segment of DNA (or the corresponding sequence of RNA) that can consists of both exons and introns in eukaryotes but only exons in prokaryotes.
 

Biology

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