Bozeman Science - Transport Across Cell Membranes
Video Questions and Answers 2023 with complete solution
Does the movement of molecules to fill a space require energy?
No (diffusion)
What are the two forms of transports?
active transport; passive transport (diffusion)
What is diffusion and describe an example in living systems
random movement of particles from high to low concentration; oxygen into body, CO2
out of body
What is specific to osmosis
diffusion of water
What is a specific type of diffusion that requires proteins?
facilitated diffusion
What substance is needed for Active Transport? Why?
ATP (moving particles where they don't want to go)
What is the most famous example of active transport?
Na+/K+ Pump
What is the name of two large-scale forms of active transport?
exocytosis, endocytosis
In his example, when the gray and black particles move, what determines which
direction?
gradient of the particles
Is there ordered movement in his example?
No, random movement
Where can diffusion be seen in living systems?
alveoli (oxygen flows out of alveoli into capillary beds and CO2 flows into alveoli)
Define osmosis
the diffusion of water across a semi-permeable membrane
In the U-Tube experiment, why does the slug shrivel up?
When salt is added, water moves out of the slug because it creates a hypertonic
environment
Define hyerptonic
higher solute concentration
Define hypotonic
lower solute concentration
Define isotonic
equal solute concentration
Concerning facilitated diffusion: What doesn't it require? What does it require?
Doesn't require energy, requires the presence of a cell surface protein
What is the difference between diffusion and facilitated diffusion?
Facilitated requires a protein for particles to move (diffuse)
Describe how glucose must enter a cell, explain why.
GLUT (glucose transport protein), when glucose makes contact, protein changes shape
to move glucose across membrane (glucose is too large)
Video Questions and Answers 2023 with complete solution
Does the movement of molecules to fill a space require energy?
No (diffusion)
What are the two forms of transports?
active transport; passive transport (diffusion)
What is diffusion and describe an example in living systems
random movement of particles from high to low concentration; oxygen into body, CO2
out of body
What is specific to osmosis
diffusion of water
What is a specific type of diffusion that requires proteins?
facilitated diffusion
What substance is needed for Active Transport? Why?
ATP (moving particles where they don't want to go)
What is the most famous example of active transport?
Na+/K+ Pump
What is the name of two large-scale forms of active transport?
exocytosis, endocytosis
In his example, when the gray and black particles move, what determines which
direction?
gradient of the particles
Is there ordered movement in his example?
No, random movement
Where can diffusion be seen in living systems?
alveoli (oxygen flows out of alveoli into capillary beds and CO2 flows into alveoli)
Define osmosis
the diffusion of water across a semi-permeable membrane
In the U-Tube experiment, why does the slug shrivel up?
When salt is added, water moves out of the slug because it creates a hypertonic
environment
Define hyerptonic
higher solute concentration
Define hypotonic
lower solute concentration
Define isotonic
equal solute concentration
Concerning facilitated diffusion: What doesn't it require? What does it require?
Doesn't require energy, requires the presence of a cell surface protein
What is the difference between diffusion and facilitated diffusion?
Facilitated requires a protein for particles to move (diffuse)
Describe how glucose must enter a cell, explain why.
GLUT (glucose transport protein), when glucose makes contact, protein changes shape
to move glucose across membrane (glucose is too large)
