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Help me solve some college biology problems! Thank you ~ chemical modification nouns explain the regulation of gene expression of Michaelis constant operon in enzyme biotransformation
Michaelis constant: the substrate concentration when the initial speed (υ0) of enzymatic reaction reaches half of the maximum reaction speed (υmax) for a given reaction.

Operon is a gene expression unit, which consists of one or more related genes and promoter sequences of operon, and regulates their transcription.

Briefly describe the * * * and personality of enzymes and general catalysts.

* * *: Like other catalysts, enzymes can significantly change the chemical reaction rate, but they cannot change the equilibrium constant. They don't change themselves before and after the reaction. The way to increase the number of activated molecules is to accelerate the reaction rate by reducing the activation energy required for the reaction.

Personality: high efficiency, specificity, controllability, and easy inactivation of enzyme.

Active forms of vitamin D3 (1, 25-(OH) 2D3)