Polypetide chain termination is enhanced by
A. Stop codonB. promoter
C. Ribosomal unit
D. Peptidyl transferase
E. UAA
The Answer is. (A) Stop codon ; (E) UAA
• Peptide chain termination is enhanced by stop codon
or the nonsense codon
• The stop codons are UAG, UGA, UAA
Classes of proteins involved in Replication
— DNA polymerase : Deoxynucleotide polymerization.
— Helicase : progressive unwinding oi DNA.
— Topoisomerase : Relieves torsional strain that
results from helicase-induced unwinding.
— DNA primase : Initiates synthesis of RNA primers.
— DNA ligases seals single strand nick between the
nascent chain and okazaki fragments on lagging strand,
— Single stand-Binding protein : prevents premature reannealing of ds DNA.
— Single stand-Binding protein : prevents premature reannealing of ds DNA.
• RNA polymerase.: It synthesises short strands of RNA
