17 Questions
What describes the net movement of a solvent across a selectively permeable membrane?
Osmosis
Which type of protein allows the movement of water through the cell membrane?
Channel protein
What is the force that could oppose the movement of water across a membrane due to osmosis?
Gravity
Which transport process uses the energy of ATP to move molecules across the cell membrane?
Primary active transport
What is the term used to describe the tendency of a solution to draw water in by osmosis?
Osmotic pressure
What is the function of the hydrophilic regions in a cell membrane?
To interact with the watery environment inside or outside the cell
What is the primary function of a carrier protein in the cell membrane?
To bind to specific proteins and transport them across the membrane
Which type of molecular movement occurs when there is no longer a concentration gradient?
Net movement stops
What is the main difference between simple diffusion and facilitated diffusion?
Simple diffusion involves movement of molecules without assistance, facilitated diffusion requires carrier proteins
What is the role of channel proteins in the cell membrane?
To form openings for certain molecules to pass through based on their shape and charge
Why are lipids and embedded proteins crucial for maintaining homeostasis in cells?
To support active maintenance of a stable environment
What is the main reason for the dynamic nature of cell membranes?
The ability of membrane lipids to move
How does cholesterol affect membrane fluidity at high temperatures?
Decreases membrane fluidity
Which type of fatty acid tails results in a more fluid membrane?
Fewer carbon to carbon double bonds
What role do transporters play in cell membranes?
Move ions or molecules across the membrane
Which kind of protein spans the entire lipid bilayer?
Transmembrane proteins
How do channel proteins differ from carrier proteins in cell membranes?
Channel proteins move ions/molecules across membranes passively, while carrier proteins require energy.
Explore the structure and functions of the cell membrane, including hydrophilic and hydrophobic regions, as well as the role of peripheral proteins. Learn how the cell membrane maintains homeostasis to ensure a stable cellular environment.
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