DNA gyrase catalyse ATP dependant –ve supercoiling as these are topoisomerases which influence the topological state of DNA. It is type II topoisomerase which induce –ve supercoils (or relax +ve supercoils) by looping the template and cutting one of the double helices and then 2 ends are twisted for –ve supercoils. Type I topoisomerase unwinds –ve supercoils to control protein synthesis and facilitate DNA replication, and ease out problems due to unwinding of double helical forms.

Correct Option: A

DNA gyrase catalyse ATP dependant –ve supercoiling as these are topoisomerases which influence the topological state of DNA. It is type II topoisomerase which induce –ve supercoils (or relax +ve supercoils) by looping the template and cutting one of the double helices and then 2 ends are twisted for –ve supercoils. Type I topoisomerase unwinds –ve supercoils to control protein synthesis and facilitate DNA replication, and ease out problems due to unwinding of double helical forms.

Peptidyl transferase is an amino acyltransferase and forms peptide links between adjacent amino acids using tRNA during translation process. This peptidyl transferase activity is mediated by 23 ribosomal RNA. This ribozyme 23 rRNA is the transferase component in bacteria. Also in eukaryotic cells, the same 23 rRNA holds the subunit containing peptidyl transferase component acting as the ribozyme.

Correct Option: B

Peptidyl transferase is an amino acyltransferase and forms peptide links between adjacent amino acids using tRNA during translation process. This peptidyl transferase activity is mediated by 23 ribosomal RNA. This ribozyme 23 rRNA is the transferase component in bacteria. Also in eukaryotic cells, the same 23 rRNA holds the subunit containing peptidyl transferase component acting as the ribozyme.

NA

Correct Option: C

NA