A, b, c,d some pick and help me

Which organelles are involved in energy conversion

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.

Located at the epidermal-dermal junction of the skin. select all true statements about the transformation of melanocytes into abnormal cell