9. What is removed during post transcriptional modification? a) Introns b) Exons c) 5'Cap d) Mutations 10. How does a single eukaryotic cell contain an entire genome:worth of DNA? a) Chromatin fibres b) Histones c) Supercoiling d) All of the above

Question

9. What is removed during post transcriptional modification? a) Introns b) Exons c) 5'Cap d) Mutations 10. How does a single eukaryotic cell contain an entire genome:worth of DNA? a) Chromatin fibres b) Histones c) Supercoiling d) All of the above

Answer 1

9. **a) Introns**Introns are non-coding sequences within a gene. During post-transcriptional modification, they are removed from the pre-mRNA molecule through a process called splicing. Exons, the coding sequences, are joined together to form the mature mRNA.10. **d) All of the above**Eukaryotic cells manage to pack an enormous amount of DNA into a tiny nucleus through several mechanisms:* **Chromatin fibres:** DNA is wrapped around histone proteins to form chromatin fibres, which are more compact than naked DNA.* **Histones:** These proteins act as spools around which DNA winds, facilitating the first level of DNA compaction.* **Supercoiling:** Further coiling and looping of the chromatin fibres compresses the DNA even more, allowing it to fit within the nucleus.

Question

9. What is removed during post transcriptional modification? a) Introns b) Exons c) 5'Cap d) Mutations 10. How does a single eukaryotic cell contain an entire genome:worth of DNA? a) Chromatin fibres b) Histones c) Supercoiling d) All of the above

Solution

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