alleryStart learning →Where are introns removed from a pre-mRNA, and what becomes of them?
AIn the cytoplasm, and they are translated
BIn the nucleolus, and they are re-used
CIn the cytoplasm, and they are exported
DIn the nucleus, and they are degraded
Answer & Solution
Correct answer: D. In the nucleus, and they are degraded
1. Splicing happens while the pre-mRNA is still inside the nucleus.
2. The excised introns are degraded rather than kept or exported.
3. Only finished transcripts that have been capped, tailed and spliced leave for the cytoplasm.
4. Nothing about an intron is translated, so the option putting them on a ribosome is wrong.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 15 "Genes and Proteins", section 15.4 RNA Processing in Eukaryotes_
Keep practising Genes and Proteins
Browse all Genes and Proteins questions for CSIR NET, or explore more Biology topics.
Related questions
How long does the E. coli translation apparatus take to add one amino acid?Tetracycline blocks the A site of a bacterial ribosome. Which step does that stop?What do chaperone molecules do during protein folding?What does a signal sequence do for a newly made protein?What kind of catalyst is peptidyl transferase, and where does it sit?In what order does a charged tRNA pass through the three compartments of the ribosome?Which ribosomal site does the initiator tRNA occupy as the initiation complex forms?In the Kozak consensus around a vertebrate start codon, which bases can occupy the R posit