Movements of Ions and Molecules
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In a phospholipid, what bone forms a kink in the chain?
A cis bond
What is the name for the concept that a phospholipid has hydrophilic and hydrophobic components?
Amiphiphatic
During endocytosis, what part of the membrane must interact in order for something to be taken into a cell in a vesicle?
The phospholipid heads
What specifically about a charged molecule stops it from passing through the bilayer?
It has a shell of water around it so will not get through the hydrophobic part of the membrane.
What is evidence for the sodium - potassium pump?
• Tracer studies with radioactive isotopes • Sodium and ATP must be outside and potassium inside • Metabolic poisons block the pump
What does an ATPase enzyme do?
Hydrolyses ATP
How are symporters and antiporters different?
Symporters transport molecules in the same direction across the membrane and antiporters transport them in different ways