10 Questions
What is membrane transport in cellular biology?
Membrane transport refers to the collection of mechanisms that regulate the passage of solutes such as ions and small molecules through biological membranes.
What is the main characteristic of the cell membrane?
The cell membrane is selectively permeable.
Explain passive transport or diffusion in cells.
Passive transport or diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration, down a concentration gradient.
What is the significance of diffusion to cells?
Diffusion allows cells to gain useful substances, obtain energy, grow, and get rid of waste products.
Name the two basic mechanisms by which molecules can move into or out of cells.
1- Passive transport or diffusion, 2- Active transport
What determines the rate of diffusion?
The steepness of the concentration gradient, temperature, solubility of the substance, permeability of the cell membrane, thickness of the cell membrane, size of the molecule, size of the ions, and charge of the ions.
What are the three types of gated channels in the cell membrane?
Voltage-gated channels, ligand-gated channels, and mechanically gated channels.
What is the process by which water soluble substances with larger molecules are transported through the cell membrane with the help of carrier proteins?
Facilitated diffusion.
What is the net movement of water from a region of high water concentration to a region of low water concentration?
Osmosis.
What is the movement of large quantities of substances from a region of high pressure to a region of low pressure?
Bulk flow.
Test your knowledge on transport mechanisms through the cell membrane in cellular biology with this quiz based on Dr. Treefa F. Ismail's lecture 3. Explore the regulation of solute passage, lipid bilayers, and selective permeability of cell membranes.
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