What are enzymes called that have slightly different molecular structures but are functionally identical?

How does the presence of an enzyme affect the activation energy of a reaction?

Who coined the term $zymase$ for enzymes in yeast?

According to the lock and key hypothesis,which complex is formed when an enzyme binds to a substrate?

$S$ - Statement: Ligases are enzymes that catalyze the linking of two compounds together.
$R$ - Reason: Isomerases are enzymes that catalyze the inter-conversion of optical,geometric,or positional isomers.

Those nucleic acids which behave like enzymes are known as