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Lipids and Carbohydrates: Phospholipids make Good Barriers
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<p class="pagetitle"><strong>Lipids and Carbohydrates:</strong> Phospholipids Make Good Barriers</p>
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<td><img src="atomMainIdea.png" width="98" height="58"></td>
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What structures can be produced by placing phospholipids in water?
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Scientists think that the first steps of cellular evolution was the emergence of small spherical particles made of lipids. Gradually, as these lipids became more complicated, cell membranes formed that were capable of separating the interior of these spheres from the water outside. The models on this page will help you explore how cells' surfaces may have evolved.
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Lipid bilayers
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Many think that the evolution of cells likely began when phospholipids,
appeared in water, making microscopic spheres which interior was
protected from the water outside. In the model on the left,
phospholipids form a bilayer. In effect, they create a wall that
separates the space above from the space below.
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Making surfaces that separate inside and outside is one of the most
important functions of lipids. The cell membrane regulates what enters
and leaves the cell and also aids in the protection of the cell.
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<b>What to do:</b>
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Click the radio buttons to select a model.
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Determine what can cross the membrane.
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Which statement about membrane phospholipids is not true?
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They associate to form bilayers.
They ahve hydrophobic "tails."
They have hydrophilic "heads."
They allow certain materials to pass by them.
They move easily from one side ofthe membrane to the other.
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Membranes can keep chemicals inside and outside of the cell. What would
happen if a cell membrane breaks?
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<p class="firstp" align="center"><strong>You have reached the end of Part 1.<BR><a href="script:page:0:message endPartOne.html">CLICK HERE BEFORE REPORTING.</a></strong></p>
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Lipids and Carbonhydrates: Day One
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