The lactate shuttle study guide

The lactate shuttle study guide - The lactate shuttle study...

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The lactate shuttle study guide 1. You need to understand the structure of the lipid bilayer The bilayer consists of two sheets of biolipid molecules oriented in opposite directions. The heads of the phospholipids face outwards. They are attracted to the watery environments inside and outside the cell (hydrophilic). The hydrophobic phospholipids tails are sandwiched between the heads to minimize their interaction with water. 2. What does the term “selectively permeable” mean with respect to the lipid bylayer? The plasma membrane lets some substances through and not others. The hydrophobic interior of the bilayer is one reason membranes are selectively permeable. 3. What do the terms hydrophilic and hydrophobic mean? Hydrophilic means it is attracted to water. Hydrophobic means it is repelled by water. 4. What type of molecules can pass through the lipid bylayer without a transport mechanism? Molecules that are soluble in lipids can easily pass through the membrane. 5. What type of molecules cannot pass through the lipid bylayer without a transport mechanism? Large molecules like glucose and lactate that are not fat soluble, and ions such as sodium ions and hydrogen ions cannot pass through the membrane. These require a transport mechanism such as carrier proteins, pumps and channels. 6. What is the difference between passive and active transport across the cell membrane? Transport of molecules across a membrane is called active transport if it requires energy and passive transport if it does not. 7. Make sure you understand the different passive transport mechanisms Simple Diffusion – particles move from where there are a lot of them to where there is less; Oxygen and CO2 molecules are examples of molecules that move into and out of cells by simple diffusion. Facilitated Diffusion – molecules are transported across the membrane by carrier
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This test prep was uploaded on 04/19/2008 for the course APK 4125 taught by Professor Drenning during the Spring '08 term at University of Florida.

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The lactate shuttle study guide - The lactate shuttle study...

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