12 Questions
Which type of molecules can easily cross the cell membrane?
Small and non-polar lipid-soluble molecules
What is the difference between passive and active transport?
Passive transport moves molecules along the concentration gradient, while active transport moves molecules against the concentration gradient
What is the characteristic of bulk transport?
It involves the movement of large macromolecules such as proteins or polysaccharides
What is the role of the concentration gradient in determining the movement of molecules across the cell membrane?
It determines whether molecules can cross the cell membrane by passive transport
What is the function of the transport proteins in the cell membrane?
Creating tunnels for selective substance transport
How is the structure of the cell membrane described?
A sandwich of phospholipids with hydrophilic heads and hydrophobic tails
Why is the cell membrane considered semipermeable?
It allows essential molecules to enter and waste products to exit
What is the role of cholesterol molecules in the cell membrane?
Contributing to the fluidity of the cell membrane
What is the term used to describe the movement of water that is a specific type of diffusion?
Osmosis
In which type of solution does a water solution with less solute (more diluted solution) have higher water potential?
Hypotonic solution
What term refers to the strength of a solution in relation to osmosis, and is used when comparing two different solutions?
Tonicity
What does the prefix -iso mean in relation to tonicity?
The same concentration
This quiz covers the structure and function of the cell membrane, also known as the plasma membrane. It discusses its role as a semipermeable membrane in regulating the passage of substances into and out of the cell, and the composition of the phospholipid bilayer.
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