Podcast
Questions and Answers
Which type of transport involves the movement of molecules in the direction determined by their relative concentrations inside and outside of the cell?
Which type of transport involves the movement of molecules in the direction determined by their relative concentrations inside and outside of the cell?
- Simple diffusion
- Active transport
- Passive diffusion
- Facilitated diffusion (correct)
What is the main difference between passive diffusion and facilitated diffusion?
What is the main difference between passive diffusion and facilitated diffusion?
- Facilitated diffusion requires an external source of energy, while passive diffusion does not
- Facilitated diffusion involves the movement of molecules through membrane proteins, while passive diffusion does not (correct)
- Passive diffusion involves the movement of molecules through membrane proteins, while facilitated diffusion does not
- Passive diffusion requires an external source of energy, while facilitated diffusion does not
Which type of transporter enables large and polar (charged) molecules to cross the membrane without directly interacting with its hydrophobic interior?
Which type of transporter enables large and polar (charged) molecules to cross the membrane without directly interacting with its hydrophobic interior?
- Uniporter
- Symporter
- Antiporter
- Carrier (correct)
Which type of active transport uses energy or a gradient generated by another active transporter?
Which type of active transport uses energy or a gradient generated by another active transporter?
Which type of transporter transports only one molecule?
Which type of transporter transports only one molecule?
Which type of active transport is driven by a gradient that was generated by a primary active transporter?
Which type of active transport is driven by a gradient that was generated by a primary active transporter?
Which of the following is NOT a characteristic that affects the permeability of molecules?
Which of the following is NOT a characteristic that affects the permeability of molecules?
Which of the following is NOT an example of a common membrane protein?
Which of the following is NOT an example of a common membrane protein?
What is the main difference between ion channels and transport proteins?
What is the main difference between ion channels and transport proteins?
How are channels activated?
How are channels activated?
What is the process of facilitated diffusion?
What is the process of facilitated diffusion?
What are the three types of active transport?
What are the three types of active transport?
Which state of a transporter exposes the binding sites for solutes to the outside?
Which state of a transporter exposes the binding sites for solutes to the outside?
Which type of transport occurs spontaneously by diffusion and does not require energy?
Which type of transport occurs spontaneously by diffusion and does not require energy?
What is the main difference between active transport and passive transport?
What is the main difference between active transport and passive transport?
What happens during simple diffusion?
What happens during simple diffusion?
Which state of a transporter exposes the binding sites for solutes to the inside?
Which state of a transporter exposes the binding sites for solutes to the inside?
What is the main characteristic of active transport?
What is the main characteristic of active transport?
Which type of membrane proteins interact with solutes more weakly compared to transporters?
Which type of membrane proteins interact with solutes more weakly compared to transporters?
What is the function of aquaporins?
What is the function of aquaporins?
Which ion cannot be successfully accommodated in the selectivity filter of a channel?
Which ion cannot be successfully accommodated in the selectivity filter of a channel?
What is the main function of the Na+/K+-ATPase in animal cells?
What is the main function of the Na+/K+-ATPase in animal cells?
Which type of membrane protein binds a specific substrate to be transported and undergoes conformational changes to transfer the solute across the membrane?
Which type of membrane protein binds a specific substrate to be transported and undergoes conformational changes to transfer the solute across the membrane?
In which type of cells are aquaporins expressed on the plasma membrane to make water movement more efficient?
In which type of cells are aquaporins expressed on the plasma membrane to make water movement more efficient?
Which of the following is true about membrane transport proteins?
Which of the following is true about membrane transport proteins?
What restricts the passage of most polar molecules across the lipid bilayer?
What restricts the passage of most polar molecules across the lipid bilayer?
What is the result of an active transport and passive diffusion in maintaining the resting membrane potential of cells?
What is the result of an active transport and passive diffusion in maintaining the resting membrane potential of cells?
What is the electrochemical gradient of a charged solute influenced by?
What is the electrochemical gradient of a charged solute influenced by?
How do transporters typically span the plasma membrane?
How do transporters typically span the plasma membrane?
What are the common structural features of transport proteins?
What are the common structural features of transport proteins?
