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Questions and Answers
What type of substances cannot diffuse through the phospholipid bilayer of cell membranes?
What type of substances cannot diffuse through the phospholipid bilayer of cell membranes?
- Both large polar molecules and ions (correct)
- Small non-polar molecules
- Charged ions
- Large polar molecules
Which type of diffusion involves the assistance of proteins in crossing the phospholipid bilayer?
Which type of diffusion involves the assistance of proteins in crossing the phospholipid bilayer?
- Active transport
- Facilitated diffusion (correct)
- Simple diffusion
- Osmosis
What are the two types of proteins that enable facilitated diffusion?
What are the two types of proteins that enable facilitated diffusion?
- Receptor proteins and enzyme proteins
- Glycoproteins and lipoproteins
- Channel proteins and carrier proteins (correct)
- Integral proteins and peripheral proteins
Which type of protein allows charged substances like ions to diffuse through the cell membrane?
Which type of protein allows charged substances like ions to diffuse through the cell membrane?
How do most channel proteins operate to control the exchange of ions?
How do most channel proteins operate to control the exchange of ions?
Which process requires energy for the movement of substances against their concentration gradient?
Which process requires energy for the movement of substances against their concentration gradient?
What is the main function of carrier proteins in facilitated diffusion?
What is the main function of carrier proteins in facilitated diffusion?
Why are carrier proteins considered highly specific?
Why are carrier proteins considered highly specific?
'Gated' channel proteins control the movement of ions by:
'Gated' channel proteins control the movement of ions by:
'Carrier proteins in facilitated diffusion are essential because they:
'Carrier proteins in facilitated diffusion are essential because they:
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