18 Questions
What happens to cells without cell walls in a hypertonic solution?
They lose water and shrivel.
What is the primary function of transport proteins in facilitated diffusion?
To speed the passive movement of molecules across the plasma membrane.
What type of protein allows specific ions to cross the membrane?
Channel proteins
What is the effect of a hypotonic solution on cells without cell walls?
They gain water and swell.
What triggers the opening of gated channels in nerve cells?
Electrical stimulus
What is the net direction of water diffusion in a hypertonic solution?
From the inside of the cell to the surrounding solution
What is the primary purpose of transport proteins in a cell membrane?
To move specific substances across the membrane
What is the driving force behind the movement of particles during passive transport?
Concentration gradient of the substance
What is the result of a substance diffusing down its concentration gradient?
It spreads out evenly into the available space
What is the characteristic of a membrane that allows certain substances to pass through while restricting others?
Selective permeability
What is the term for the movement of particles from an area of higher concentration to an area of lower concentration?
Diffusion
What is the state in which the number of molecules crossing the membrane in one direction is equal to the number of molecules crossing in the other direction?
Dynamic equilibrium
What is the characteristic of facilitated diffusion in terms of energy requirement?
It does not require any energy input
What is the direction of solute movement in facilitated diffusion?
Down their concentration gradients
What is the role of carrier proteins in facilitated diffusion?
To move substances down their concentration gradients
What is the effect of facilitated diffusion on the solute concentration inside the cell?
It has no effect on the solute concentration
What is the relationship between the binding and release of the transported molecule and the shape change of carrier proteins?
The binding and release triggers a shape change
What is the difference between facilitated diffusion and active transport in terms of energy requirement?
Active transport requires more energy than facilitated diffusion
Learn about transport proteins, their role in facilitating the passage of hydrophilic substances across cell membranes. Understand how channel proteins and carrier proteins work to transport specific molecules and ions. Quiz yourself on the functions of transport proteins in cellular processes.
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