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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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Q. If the base sequence of one DNA template strand is CAACATGTAGCAAGT, what would be the base sequence in the RNA transcribed against it?

Q. Consider these following sentences and choose the correct ones.
I. Each gene contains a specific promoter region and a leader sequence for guiding the beginning of transcription.
II. Only one strand for DNA, called template strand is copied by RNA polymerase this strand runs in

3^{'} \to 5^{'}

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III. RNA polymerase adds complementary nucleotides forming single strand mRNA in

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IV. Section of DNA that has been transcribed is rewound into its original configuration.

Q. How many of the following statements are correct?

A. Coding strand is also called a template strand which gets transcribed to RNA.

B. Template strand is considered as a non-coding strand which gets transcribed to RNA.

C. Coding strand of DNA (sense strand) has the same sequences as transcribed RNA, except for having thymine in place of RNA’s uracil.

D. The template strand of DNA has the same sequences as transcribed RNA.

E. Coding strand (sense strand) has the same sequences as transcribed RNA, except for having uracil in place of RNA’s thymine.

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A A C G T A A C G

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Transcription

BIOLOGY

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Introns & Exons

Standard XII Biology

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