Transport in cells Flashcards
What is the primary function of transport mechanisms in cells?
To move substances across the cell membrane.
True or False: Passive transport requires energy input from the cell.
False
Fill in the blank: The movement of molecules from an area of higher concentration to an area of lower concentration is called ___.
diffusion
What type of transport involves the use of transport proteins to move substances across the membrane without energy?
facilitated diffusion
Which transport mechanism requires energy in the form of ATP?
active transport
Multiple choice: Which of the following is an example of active transport? A) Osmosis B) Sodium-potassium pump C) Simple diffusion
B) Sodium-potassium pump
What is osmosis?
The diffusion of water across a selectively permeable membrane.
True or False: Endocytosis is a form of active transport.
True
Fill in the blank: The process by which cells expel materials is called ___.
exocytosis
What is the difference between passive and active transport?
Passive transport does not require energy, while active transport does.
Multiple choice: Which type of transport mechanism allows large molecules to enter the cell? A) Diffusion B) Endocytosis C) Osmosis
B) Endocytosis
What is the role of channel proteins in facilitated diffusion?
To provide a passageway for specific molecules to cross the membrane.
True or False: Carrier proteins change shape to transport substances across the membrane.
True
Fill in the blank: Transport that moves substances against their concentration gradient is called ___.
active transport
Multiple choice: Which of the following is NOT a type of passive transport? A) Diffusion B) Filtration C) Active transport
C) Active transport
True or False: Water can pass through the cell membrane freely.
True
What is phagocytosis?
The process by which a cell engulfs large particles or other cells.
True or False: Active transport can occur against a concentration gradient.
True
What is the significance of the concentration gradient in transport mechanisms?
It determines the direction of movement for passive transport.
Fill in the blank: The process by which cells take in large particles is known as ___.
phagocytosis
What is the main difference between exocytosis and endocytosis?
Exocytosis is the process of expelling materials from the cell, while endocytosis is the intake of materials.
