4. There are two properties of any given molecule that determine its movement ac

Question

4. There are two properties of any given molecule that determine its movement across cell membranes: the size of the molecule and its solubility in lipids. Large non lipid-soluble molecules cannot cross directly, whereas small lipid-soluble molecules can cross directly through the bilayer. Based on this knowledge, predict which of the following things will be able to pass directly through the phospholipid bilayer. Explain your reasoning in the justification column. Justification Substance Pass CO2 NaCI YESNO albumin (protein) Water O2 glucose steroid hormone 5. How could something that cannot get through the phospholipid bilayer manage to get across the plasma membrane? 98

Explanation / Answer

4.

5. Such molecules pass into the cells through channels (ions, water), exchangers (calcium ions), and transporters (glucose; heavy metallic ions) or through endocytosis (viruses) and exocytosis (secretory proteins).

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