Refer to the given dichotomous key regarding cell organelles.
Identify the cell organelles P, Q, R, S and T and select the correct statement regarding them.
AP can be endoplasmic reticulum and Q can be Golgi apparatus.
BR can be chloroplast and S can be ribosomes.
CP can be nucleus and T can be ribosomes.
DR can be mitochondria and S can be lysosomes.
From when did nucleus become an organelle??