mRNA differs from DNA because mRNA

  1. is double-stranded
  2. contains uracil and ribose and is single-stranded
  3. contains deoxyribose
  4. contains thymine
Answer

B) contains uracil and ribose and is single-stranded

RNA uses U and ribose. AS & A Level Biology · Topic 6 Nucleic Acids and Protein Synthesis · 6.1 Structure of nucleic acids and replication of DNA

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