Which sentence best describes exocytosis? a
A vesicle fuses to the cell membrane and its contents leave the cell.
b
A vesicle fuses to a lysosome and its contents are destroyed.
c
A vesicle fuses to the nuclear envelope and its contents enter the nucleus.
d
A vesicle fuses to the cell membrane and its contents enter the cell.

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

answer; the male's sperm cells have mitochondria, but because the sperm contributes dna but no cytoplasm, no mitochondria are passed to the egg at ferilization;