Cell Membrane And Transport Flashcards
What is the primary function of the cell membrane?
To protect the cell and regulate what enters and exits.
True or False: The cell membrane is a rigid structure.
False: The cell membrane is flexible and fluid.
Fill in the blank: The cell membrane is primarily composed of __________.
phospholipids.
What structure is used to describe the arrangement of phospholipids in the cell membrane?
Fluid mosaic model.
Which type of transport does not require energy?
Passive transport.
What is the main difference between diffusion and osmosis?
Diffusion is the movement of solute, while osmosis is the movement of water.
True or False: Active transport moves substances against their concentration gradient.
True.
What are membrane proteins primarily responsible for?
Facilitating transport and communication across the membrane.
Multiple Choice: Which of the following is an example of passive transport? A) Endocytosis B) Exocytosis C) Facilitated diffusion D) Active transport
C) Facilitated diffusion.
What is the term for the process by which cells take in large particles?
Endocytosis.
Fill in the blank: __________ is the movement of water molecules through a semi-permeable membrane.
Osmosis.
What is the role of cholesterol in the cell membrane?
To maintain membrane fluidity and stability.
True or False: Ion channels are a type of integral protein.
True.
What type of solution causes a cell to swell?
Hypotonic solution.
Multiple Choice: Which of the following processes requires ATP? A) Facilitated diffusion B) Osmosis C) Active transport D) Simple diffusion
C) Active transport.
What is the term for the pressure exerted by water inside a plant cell?
Turgor pressure.
Fill in the blank: The ___________ is responsible for packaging and transporting proteins.
Golgi apparatus.
What is a characteristic feature of facilitated diffusion?
It requires specific transport proteins.
True or False: The cell membrane is impermeable to all substances.
False: It is selectively permeable.
What is the primary role of glycoproteins in the cell membrane?
Cell recognition and communication.
Which type of transport involves vesicles?
Bulk transport.
Multiple Choice: What type of molecules can easily pass through the lipid bilayer? A) Ions B) Large polar molecules C) Small nonpolar molecules D) All of the above
C) Small nonpolar molecules.
What happens to a cell placed in a hypertonic solution?
It shrinks due to water loss.
Fill in the blank: __________ allows cells to expel waste materials.
Exocytosis.
