Double layered nuclear, the outer nuclear membrane is continuous with the membrane of the rough endoplasmic reticulum (ER), it also continues with the inner nuclear membranes since the two layers are fused together at a numerous tiny holes called nuclear pores that perforate the nuclear enevelope
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Stem cells can differentiate into any type of cell so they can be used to produce/repair nerve tissues. Advantage of using embryonic stem cells is that they are easier to extract than adult stem cells.
D. Homologous - an equivalent copy from the father and the mother = a pair