Cell Membrane
What are the 2 types of Cell membrane transport?
Active and Passive.
The cell membrane is semi-permeable, what does that mean?
T Only some things can get in or out.
Diffusion is when...
Molecules move down their concentration gradient.
Tell why active transport requires energy?
It always requires energy because it is moving up its gradient.
What is (are) the main difference(s) between passive transport and active transport?
A. Active transport works against gravity (for example, upwards from the roots of a tree); passive transport works with gravity
B. Active transport requires cellular energy for substances to cross the cell membrane; passive transport does not
C. Passive transport occurs primarily in single-cell organisms; active transport occurs primarily in multi-cellular organisms
D. Passive transport does not require any cellular proteins; active transport requires cellular proteins
DJ B. Active transport requires cellular energy for substances to cross the cell membrane; passive transport does not
What is the macromolecule mainly used in the phospholipid bilayer?
Lipids
What is the movement of water call?
DJ osmosis.
Name the 3 types of passive transport.
Simple diffusion, Facilitated Diffusion, Osmosis.
What does the gated/closed protein channels do?
They help to move molecules into/out of a cell against its gradient.
Glucose is not able to pass through a semipermeable cell membrane. If the cells need sugar to make ATP and carry out cellular processes, how does the sugar get into the cell?
A. active transport using ATP and carrier proteins
B passive transport by osmosis through the proteins
C. active transport using a process called phagocytosis
D. passive transport by diffusion through proteins
D. passive transport by diffusion through proteins
Do phospholipids like water? Why or why not?
The head is hydrophilic and the tail is hydrophobic.
Which molecules are involved in diffusion?
Water (H20) Oxygen (O2) Carbon Dioxide (CO2) ----> SMALL!
When will diffusion stop occurring?
When it reaches its equalibrium.
What is Exocytosis?
Molecules are moved out of the cell using membrane-bound vesicles.
Cells need to bring in water molecules to carry out cellular processes. This requires moving the molecules across the cell membrane. How do these molecules get into the cell?
A. passive transport by simple diffusion
B. active transport by exocytosis
C. passive transport by osmosis
D. active transport by osmosis
DJ C. passive transport by osmosis
What is embedded in the phospholipid bilayer?
Proteins.
Name some molecules that are a part of facilitated diffusion.
Sugar/Glucose (C6H12O6) Chlorine (Cl-) Sodium (Na+) [These are big]
What is osmosis??
The amount of solute in a solution affects the movement of the solvent across the cell membrane.
What is Endocytosis?
Molecules are moved into the cell in membrane-bound vesicles.
A root cell may continue to absorb minerals even though the concentration of the minerals is greater inside the cell than in the soil. How does the cell accomplish this absorption?
A. through osmosis
B. through passive transport
C. through diffusion
D. through active transport
T D. through active transport
What is the cell membrane's job?
To maintain homeostatis.
What does diffusion never require???
Energy!!!!
Which statement best explains the difference between active and passive transport?
A. Passive transport requires the use of a protein while active transport does not.
B. Active transport requires the use of a protein while passive transport does not.
C. Passive transport requires energy to occur while active transport does not.
D. Active transport requires energy to occur while passive transport does not.
C. Passive transport requires energy to occur while active transport does not.
What is the main difference between Active and Passive Transport?
DJ Active transport moves molecules from low to high whole passive moves molecules from high to low.
Algal cells are placed in an isotonic solution. Additional amounts of a solute, such as salt, is slowly added to the solution. What happens to the cells?
A. They will stay the same.
B. They will begin to swell.
C. They will burst.
D. They will shrink.
D. They will shrink.