Podcast
Questions and Answers
Which type of molecules can move across the cell membrane without needing a transport carrier?
Which type of molecules can move across the cell membrane without needing a transport carrier?
- Respiratory gases and lipid-soluble drugs (correct)
- Water-soluble drugs and glucose
- Polar molecules and steroid hormones
- Large proteins and nucleic acids
What is the main characteristic of simple diffusion as a membrane transport mechanism?
What is the main characteristic of simple diffusion as a membrane transport mechanism?
- It relies on specialized transport proteins
- It is only effective for large molecules
- It exclusively transports polar molecules
- It doesn't require energy and doesn't involve ATP utilization (correct)
Why can't polar molecules cross the cell membrane through simple diffusion?
Why can't polar molecules cross the cell membrane through simple diffusion?
- They are actively transported by carrier proteins
- They are repelled by the phospholipid heads of the membrane (correct)
- They are too large to fit through the membrane channels
- They require ATP for movement
Which molecules can dissolve right across the cell membrane through simple diffusion?
Which molecules can dissolve right across the cell membrane through simple diffusion?
What is the role of specialized transport proteins in simple diffusion?
What is the role of specialized transport proteins in simple diffusion?
Flashcards
Molecules crossing membrane without carriers
Molecules crossing membrane without carriers
Respiratory gases and lipid-soluble drugs can move directly through the cell membrane without needing transport proteins.
Simple diffusion characteristic
Simple diffusion characteristic
Simple diffusion across a membrane doesn't require energy or ATP.
Polar molecules and membrane
Polar molecules and membrane
Polar molecules are repelled by the cell membrane's hydrophobic core and can't cross through simple diffusion.
Molecules for simple diffusion
Molecules for simple diffusion
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Transport proteins in simple diffusion
Transport proteins in simple diffusion
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