Why are plant and animal cells classified as eukaryotic cells

Plant and animal cells have well defined nucleus and membrane bound organelles.

Explanation:

Eukaryotic cells (eu= true + karyon= nucleus) are the ones that have a membrane-bound well-defined nucleus in which their genetic material DNA is present. These cells also have other membrane-bound organelles such as mitochondria, endoplasmic reticulum, etc. A prokaryotic cell lacks a nucleus and membrane-bound organelles. For example, a bacterial cell is a prokaryotic cell. Since plant and animal cells have nucleus and membrane-bound organelles, they are called eukaryotic cells.

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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