Who proposed the principle of "Induced fit"?

Which of the following values is required for better enzymatic action?

Amylase is an enzyme for which the substrate is

$A$: Hormones are not enzymes,but they can stimulate the release of enzymes.
$R$: Hormones are used up in metabolism,but enzymes can act over and over again.

Which enzyme catalyzes the reaction shown below?
Lactose $\xrightarrow{\text{Hydrolysis}}$ Glucose + Galactose

Which of the following statements is consistent with the function of isomerases?