# Biology

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1) Why is it appropriate to call the endomembrane system a "system?"
2) The selective permeability of biological membranes is dependent on _______________.
3) Why is it unusual for a phosphlipid molecule to flip from one face of the membrane to the other?
4) What do we mean when we say that membranes have "sidedness?"
5) Which organelle(s) in a eukaryotic cell contain(s) DNA?
6) Why is it appropriate to call the endomembrane system a "system," and what components and/or organelles are involved?
7) The selective permeability of biological membranes is dependent on _______________.
8) Why is it unusual for a phosphlipid molecule to flip from one face of the membrane to the other?
9) What do we mean when we say that membranes have "sidedness?"

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