Describe how a similar star from the Sun changes after it leaves the Main Sequence stage of its life cycle?

After a star like sun leaves main sequence, it goes to red giant stage and then planetary nebula and finally white dwarf.

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

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.