TRANSPORT - ACTIVE TRANSPORT AND PASSIVE TRANSPORT IN PHYSICS Flashcards
(27 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 from ATP.
True
Fill in the blank: Active transport moves substances _______ their concentration gradient.
against
What is facilitated diffusion?
A type of passive transport that uses transport proteins to move molecules across the membrane.
Which of the following is an example of active transport? (a) Osmosis (b) Sodium-potassium pump (c) Diffusion
b) Sodium-potassium pump
What role do carrier proteins play in active transport?
They help move specific molecules across the membrane using energy.
Define osmosis.
The diffusion of water across a selectively permeable membrane.
True or False: Passive transport can occur without a concentration gradient.
False
What is the primary energy source for active transport?
ATP (adenosine triphosphate)
Fill in the blank: In passive transport, substances move from an area of ______ concentration to an area of lower concentration.
higher
What is endocytosis?
A process by which cells engulf substances to bring them into the cell.
Name one type of passive transport.
Diffusion
True or False: Active transport is a spontaneous process.
False
What is exocytosis?
The process by which cells expel materials in vesicles.
Which type of transport uses energy directly? (a) Passive transport (b) Active transport
b) Active transport
Fill in the blank: The ______ gradient is the difference in concentration of a substance across a space.
concentration
What is the main difference between active and passive transport?
Active transport requires energy, while passive transport does not.
Which type of transport can move large molecules into the cell?
Endocytosis
True or False: Ion channels are involved in passive transport.
True
What is the function of the sodium-potassium pump?
To maintain the electrochemical gradient by moving sodium out and potassium into the cell.
Fill in the blank: ______ transport does not require membrane proteins.
Passive
What type of molecules typically undergo facilitated diffusion?
Polar or charged molecules
True or False: Active transport can move substances against their concentration gradient.
True
What is the term for the type of transport that involves the movement of water?
Osmosis
