A fully functioning enzyme molecule is fold into a complex
three-dimensional shape and this structure determines the specific type of
molecules it interacts with during a reaction. Each functioning enzyme molecule
has a particular structure to bind <span>with a high degree of specificity to one or a few molecules
and to carry out its function. Therefore, cellular function is directly
associated to its structures.</span>
Protons(Atomic Number) - 20
Electrons(Normally the same as protons) - 20
Neutrons(Mass number-proton number) - 20
Answer:
coz the modern cells have a lot more complex structures which had evolved along time
Glycolysis, citric acid cycle, electron transport chain
