(1) they keep toxic substances out of the cell;
(2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the cell and the outside environment;
(3) they separate vital but incompatible metabolic processes conducted within organelles.
<em>when two reproductive cells join together they simply cross over their chromatids exchanging characteristics so new individual has the characters of both mother and father...</em>
The organelle that is responsible for regulating what enters and leaves the cell is A.
Answer:
chloroplast i think , i may b wrong
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