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All cell are surrounded by membranes. The main role of the cell membrane is to
A.regulate the cell's interactions with the environment
b.release any type of molecule out of the cell
c.arrange the cell's organelles in the cytoplasm
d.prevent water from leaking out of the cell

What type of molecule embedded in the cell membrane allows larger molecules to pass through the membrane by active transport
A phospholipids
b Proteins
D carbohydrates

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