Membrane Transport Flashcards
1
Q
What is the plasma membrane made up of? (4 points)
A
- bi-layer of phospholipids
- proteins
- cholesterol for stability
- glycolcalyx (sugars)
2
Q
The plasma membrane is?
A
Semi permeable
3
Q
The head of the phospholipid layer is?
A
Hydrophilic and has a phosphate group
4
Q
The tail of the phospholipid?
A
Is hydrophobic and made of fats
5
Q
What is the role of the plasma membrane? ( 6 points )
A
- acts as a barrier separating intracellular and extracellular fluid
- provides shape and support
- controls the flow of substances into and out of the cell
- cell identification
- provides receptor sites for chemical messages (hormones)
- has some enzyme-facilitate chemical reactions
6
Q
Functions of membrane proteins? ( 6 points )
A
- transport
- receptors for signal transduction
- attachment to the cytoskeleton and extracellular matrix
- enzymatic activity
- intracellular joining
- cell-cell recognition
