10 Questions
What factors determine the rate at which a molecule crosses a protein-free lipid bilayer by simple diffusion?
The size, solubility, and charge of the molecule determine the rate of diffusion.
What are the two main types of membrane transport proteins discussed in the text?
Transporters and channels are the two main types of membrane transport proteins discussed.
What is the difference between passive transport and active transport?
Passive transport allows molecules to move down their concentration gradients without requiring energy, while active transport requires an input of energy to move molecules against their concentration gradients.
Which type of membrane transport protein is capable of carrying out active transport?
Transporters are the only type of membrane transport proteins capable of carrying out active transport.
How do conformational changes in a transporter mediate the passive transport of a solute such as glucose?
Conformational changes in a transporter facilitate the movement of a solute such as glucose across the lipid bilayer without requiring energy.
What is the role of transporters in the movement of molecules or ions across a lipid bilayer?
Transporters facilitate the movement of molecules or ions across a lipid bilayer by undergoing conformational changes.
What is the difference between passive transport and active transport?
Passive transport allows molecules to move down their concentration gradients without requiring energy, while active transport requires energy to move molecules against their concentration gradients.
Give an example of passive transport mentioned in the text.
The transport of glucose across a liver cell is an example of passive transport.
What determines the rate at which a molecule crosses a protein-free lipid bilayer by simple diffusion?
The rate of diffusion is determined by the size, solubility, and charge of the molecule.
Can transporters carry out active transport with charged molecules or ions?
Yes, transporters can mediate the active transport of charged molecules or ions through conformational changes.
Test your knowledge on membrane transport and hydrophobicity with this quiz! Learn about the factors that influence the rate at which molecules cross a lipid bilayer and explore the mechanisms of transporters and channels.
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