Active And Passive Transport Flashcards
(21 cards)
What is passive transport?
The movement of substances across a cell membrane without the use of energy.
True or False: Active transport requires energy.
True
Fill in the blank: Active transport moves substances _______ their concentration gradient.
against
What is the main energy source for active transport?
ATP (adenosine triphosphate)
Which of the following is an example of passive transport? a) Endocytosis b) Diffusion c) Protein pump
b) Diffusion
What is osmosis?
The diffusion of water across a selectively permeable membrane.
True or False: Facilitated diffusion is a type of passive transport.
True
What type of transport involves carrier proteins?
Facilitated diffusion and active transport.
Fill in the blank: In active transport, substances move from _______ concentration to _______ concentration.
low; high
What is the sodium-potassium pump?
A type of active transport that moves sodium ions out of and potassium ions into the cell.
Which process allows large molecules to enter the cell? a) Exocytosis b) Diffusion c) Endocytosis
c) Endocytosis
True or False: Passive transport can occur through the lipid bilayer.
True
What is a characteristic of active transport?
It can move substances against their concentration gradient.
Fill in the blank: The _______ gradient is the difference in concentration of a substance across a space.
concentration
What is the role of transport proteins in facilitated diffusion?
They help specific substances cross the membrane more easily.
Which type of transport does not require a membrane protein? a) Active transport b) Passive transport c) Both
b) Passive transport
Fill in the blank: _______ transport is critical for maintaining cellular homeostasis.
Both active and passive
What is exocytosis?
The process of vesicles fusing with the plasma membrane to release their contents outside the cell.
True or False: Passive transport can be saturated.
False
What is the function of aquaporins?
To facilitate the transport of water across cell membranes.
What determines the direction of passive transport?
The concentration gradient.
