Unit 1.3a Flashcards
Movement of Molecules Across Membranes
What is the cells (plasma) membranes purpose?
To control the entry and exit of material in and out of the cell
What’s the cell (plasma) membrane made from?
Proteins and Phospholipids
What part of a phospholipid is hydrophilic?
The Head
What part of a phospholipid is hydrophobic?
It’s Tail
What part of the phospholipid is attracted to water?
The hydrophilic head
Is the phospholipid head or tail polar?
The head is polar (charged)
What two types of proteins are found with the plasma membrane?
Integral + Peripheral
Where could you find integral proteins?
Inside the membrane
Where could you find peripheral proteins?
On the surface of the membrane
What attaches integral proteins to the membrane?
Hydrophobic R group interact with the inside of the membrane creating strong hydrophobic interactions
What does transmembrane mean?
An integral protein that spans the whole width of the plasma membrane
What region a of the plasma membrane do transmembrane proteins interact with?
Hydrophobic region
What region of the plasma membrane do peripheral proteins interact with?
Hydrophilic region
How do peripheral proteins stick to the outside of the plasma membrane?
The peripheral proteins have hydrophilic R groups on their surface so therefore bind to the plasma membrane via hydrogen OR ionic bonding
Do peripheral proteins ever attach themselves to integral?
Yes they can interact with each other
