What is the Plasma Membrane?
The membrane surrounding ALL cells that separates the inside of the cell from outside environment.
What is the name of the molecule that is considered the building block of the Plasma Membrane?
A Phospholipid
__________ molecules are charged molecules because electrons are shared __________ between the atoms bonded together in that molecule.
A. Nonpolar, Unequally
B. Polar, Unequally
C. Nonpolar, Equally
D. Polar, Equally
B.
Polar molecules are charged molecules because electrons are shared unequally between the atoms bonded together in that molecule.
__________ molecules are neutral molecules because electrons are shared __________ between the atoms bonded together in that molecule.
A. Nonpolar, Unequally
B. Polar, Unequally
C. Nonpolar, Equally
D. Polar, Equally
C.
Nonpolar molecules are neutral molecules because electrons are shared equally between the atoms bonded together in that molecule.
Water is a ___________ molecule.
A. Polar
B. Nonpolar
Water is a Polar molecule.
A molecule that is Hydrophobic is __________.
A. Polar
B. Nonpolar
A molecule that is Hydrophobic is Nonpolar.
A molecule that is Hydrophilic is __________.
A. Polar
B. Nonpolar
A molecule that is Hydrophilic is Polar.
The Plasma Membrane is made up of many phospholipid molecules. Each Phospholipid molecule is composed of a Polar head and a Nonpolar tail. Which part of the phospholipid is Hydrophobic and which part of it is Hydrophilic?
A is Hydrophilic
B is Hydrophobic
What are the 3 main functions of the Plasma Membrane?
- Protection
- Transportation
- Communication
Explain how Protection is a function of the Plasma Membrane
- Keeps needed materials inside of the cell like water & organelles.
- Keeps harmful materials outside the cell like toxins & pathogens.
Explain how Transportation is a function of the Plasma Membrane
- Controls the movement of molecules traveling into and out of the cell.
- The Cell Membrane is Selectively Permeable.
Explain how Communication is a function of the Plasma Membrane
- Cells communicate with each other using proteins and carbs that sit on the surface of their cell membranes.
- Example: Different blood types have different glycoproteins.
A is pointing to which part of the Plasma Membrane?
Carbohydrate
B is pointing to which part of the Plasma Membrane?
Integral Protein
C is pointing to which part of the Plasma Membrane?
Glycoprotein
D is pointing to which part of the Plasma Membrane?
Hydrophilic Head of a Phospholipid
E is pointing to which part of the Plasma Membrane?
Hydrophobic Tail of a Phospholipid
F is pointing to which part of the Plasma Membrane?
Phospholipid
G is pointing to which part of the Plasma Membrane?
Peripheral Protein
H is pointing to which part of the Plasma Membrane?
Cholesterol
What are Integral Proteins and what is their function?
- Definition: Proteins that form transport channels through the membrane.
- Function: Helps transport molecules in and out of cell
What are Peripheral Proteins and what is their function?
- Definition: Proteins that sit on the inner and outer surface of the membrane.
- Function: Helps with cell communication.
What is Cholesterol and what is its function?
- Definition: Lipids that sit between the hydrophobic tails of phospholipids in the cell membrane.
- Function: Regulates the fluidity/flexibility and structure of the membrane.
What are Glycoproteins and what is their function?
- Definition: Carbohydrates linked to peripheral proteins on the outer surface of the cell membrane.
- Function: Helps with cell recognition and cell communication.