Question

the ____ is a selective barrier, regulating the passage of material into and out of the cell. plasma membrane nucleus chloroplast lysosome nuclear envelope part i where is calcium stored? centrioles rough endoplasmic reticulum smooth endoplasmic reticulum mitochondria microtubules

Explanation:

The plasma membrane is a selective - barrier controlling the movement of substances in and out of the cell. The smooth endoplasmic reticulum stores calcium ions in cells.

Answer:

1. A. plasma membrane
2. C. smooth endoplasmic reticulum