Introns are

  1. non-coding sequences removed from pre-mRNA
  2. coding sequences joined together
  3. sections of tRNA
  4. stop codons
Answer

A) non-coding sequences removed from pre-mRNA

Splicing removes introns. AS & A Level Biology · Topic 6 Nucleic Acids and Protein Synthesis · 6.2 Protein synthesis

Biology MCQ · More A Level Biology: Nucleic acids and protein synthesis MCQs · Practise