A gene is 562 base pairs long but the corresponding mRNA is 441 nucleotides long. Explain the difference.

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the A2 Genetic Control of Proteins Test. Engage with flashcards and multiple choice questions, each question is accompanied by hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

A gene is 562 base pairs long but the corresponding mRNA is 441 nucleotides long. Explain the difference.

Explanation:
Introns inside genes are non-coding regions that are transcribed but removed before the mRNA leaves the nucleus. The initial RNA transcript includes both exons (coding regions) and introns, but splicing excises the introns to produce mature mRNA that contains only the exons (plus any UTRs). That’s why the mRNA is shorter than the full DNA gene. Here, a 562-base-pair gene yields a 441-nucleotide mature mRNA, so about 121 bases come from introns that were removed during processing.

Introns inside genes are non-coding regions that are transcribed but removed before the mRNA leaves the nucleus. The initial RNA transcript includes both exons (coding regions) and introns, but splicing excises the introns to produce mature mRNA that contains only the exons (plus any UTRs). That’s why the mRNA is shorter than the full DNA gene. Here, a 562-base-pair gene yields a 441-nucleotide mature mRNA, so about 121 bases come from introns that were removed during processing.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy