Question

State the functions of ribozymes and release factor in protein synthesis?


class 12th CBSE Biology sample paper

Answer 1

For initiation, the ribosome binds to the mRNA at the start codon (AUG) that is recognised only by the initiator tRNA.  The ribosome proceeds to the elongation phase of protein synthesis.

During this stage, complexes composed of an amino acid linked to tRNA, sequentially bind to the appropriate codon in mRNA by forming complementary base pairs with the tRNA anticodon. 

The ribosome moves from codon to codon along the mRNA. Amino acids are added one by one, translated into Polypeptide sequences dictated by DNA and represented by mRNA.  At the end, a release factor binds to the stop codon, terminating translation and releasing the complete polypeptide from the ribosome.