What temperature would be best catalase and why

Catalase is an enzyme that catalyzes the breakdown of hydrogen peroxide. It has an optimum temperature of 37 degrees Celsius, but can increase its activity up to 40 degrees Celsius.

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.