Which characteristic describes all organisms in the domain Eukarya ?
A. Their cells contain a nucleus
B. Their cell nuclei lack DNA
C. Their cell are prokaryotic
D. Their cell wall contain peptidoglycan

the cells of all organisms in the domain eukarya contain a nucleus

h

explanation:

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme