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A-Level Biology OCR A

Carries Bases Mrna Molecule G C Codon Sequence

Front Draw a table to compare the structure and function of mRNA, tRNA and DNA.
Back

mRNAtRNADNA
Structure
  • Linear, single stranded molecule
  • Contains ribose
  • Contains bases A, U, G, C
  • Carries codon sequence complementary to the sequence of the gene

  • Single strand of RNA folded into clover leaf shape with three bases (anticodon) at one end of molecule
  • Contains ribose
  • Contains bases A, U, G, C
  • Carries an anticodon which is complementary to the codon on mRNA

  • Double-stranded, antiparallel double helix molecule
  • Contains deoxyribose
  • Contains bases A, T, G, C
  • Carries the original codon complementary to mRNA

Function
  • Carries genetic information (amino acid sequence order) copied from DNA 
  • Delivers correct amino acids to the ribosome in order to make up a polypeptide
  • Carries the genetic material of an organism

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