M2 RNA - 3 Forms

Question 1

mRNA

Answer 1

• Copy of a template strand
• Single stranded
• Has codons
• Made during transcription
• Moves to ribosome as a template for protein synthesis

Question 2

rRNA

Answer 2

• Complex molecule accounting for half the mass of a ribosome
• Has small subunit and large subunit
• Translation takes place on ribosomes
• Contains enzyme peptidyl transferase which catalyses the formation of peptide bonds

Question 3

tRNA

Answer 3

• Small, single stranded (80 nucleotides)
• Clover leaf shape
• Specific binding site for 20 different amino acids
• Contains an unpaired triplet base called an anticodon
• Carries an amino acid to ribosome where they are bonded together to form a polypeptide