Cell Membrane - Euks and Proks Flashcards
Which cells out of 3 are true, living cells?
Prokaryotes and Eukaryotes
Which cell out of 3 is a nonliving cell?
Virus
What is Homeostasis?
Maintaining a stable internal condition
Ex. the flow of oxygen to your heart and blood.
The structure of the cell membrane has what?
A lipid bilayer made up of 2 layers of phospholipids
What is the phosphate head?
It is water loving - hydrophilic
What is the phosphate fatty acid tail?
It is water fearing - hydrophobic
Cell membranes have pores so that they can do what?
To be selectively permeable: to allow some molecules in and keeps other molecules out
What is passive transport?
It is a type of cell transport that does NOT use energy and that includes:
a. Simple diffusion
b. Facilitated diffusion
c. Osmosis
What is active transport?
It is a type of cell transport that DOES use energy and that includes:
a. Protein pumps
b. Endocytosis
c. Exocytosis
What is simple diffusion?
Movement of molecules from high to low concentration
What is facilitated diffusion?
Movement of glucose molecules into the cell; diffusion through transport proteins
What is osmosis?
Diffusion of water molecules from high to low concentration; water moves freely through pore proteins
How do molecules move in passive transport?
They move around randomly from high to low
What is a hypotonic solution?
A hypotonic solution is when there is low solute but high water concentration; the cell fills up with water which can burst
What is a hypertonic solution?
A hypertonic solution is when there is high solute but low water concentration; the cell loses water which can shrink
