Podcast
Questions and Answers
What is the approximate thickness of the cell membrane in meters?
What is the approximate thickness of the cell membrane in meters?
- 8 x 10^-8
- 8 x 10^-9 (correct)
- 8 x 10^-11
- 8 x 10^-10
What is the primary function of proteins in the cell membrane?
What is the primary function of proteins in the cell membrane?
- To regulate traffic and act as gatekeepers (correct)
- To act as a barrier to polar substances
- To facilitate diffusion across the cell membrane
- To store energy in the fluid compartments
What is the main reason why the lipid bilayer is impermeable to polar substances?
What is the main reason why the lipid bilayer is impermeable to polar substances?
- Because of the membrane's selective permeability
- Because of the hydrogen bonds between lipids and proteins
- Because of the lipid bilayer's hydrophobic nature (correct)
- Because of the presence of proteins in the membrane
What is the term that describes the movement of molecules from an area of higher concentration to an area of lower concentration?
What is the term that describes the movement of molecules from an area of higher concentration to an area of lower concentration?
What is the proportion of lipids and proteins in the cell membrane?
What is the proportion of lipids and proteins in the cell membrane?
What is the term that describes the fluid mosaic model of membrane structure?
What is the term that describes the fluid mosaic model of membrane structure?
What percentage of lipids in the phospholipid bilayer are comprised of phospholipids?
What percentage of lipids in the phospholipid bilayer are comprised of phospholipids?
What determines the fluidity of a membrane?
What determines the fluidity of a membrane?
What type of proteins have hydrophobic regions that span the hydrophobic core of the lipid bilayer?
What type of proteins have hydrophobic regions that span the hydrophobic core of the lipid bilayer?
What is a characteristic of integral membrane proteins?
What is a characteristic of integral membrane proteins?
What can be a function of membrane proteins?
What can be a function of membrane proteins?
Why do lipids rarely flip-flop between membrane leaflets?
Why do lipids rarely flip-flop between membrane leaflets?
What is the primary reason for the selective permeability of the membrane?
What is the primary reason for the selective permeability of the membrane?
Which of the following molecules is most likely to be impermeable to the lipid bilayer?
Which of the following molecules is most likely to be impermeable to the lipid bilayer?
What is the primary function of membrane proteins in relation to transport?
What is the primary function of membrane proteins in relation to transport?
What drives the random mixing of particles in a solution during diffusion?
What drives the random mixing of particles in a solution during diffusion?
What is the result of the diffusion process once equilibrium is reached?
What is the result of the diffusion process once equilibrium is reached?
What is the primary characteristic of a substance that is lipid soluble?
What is the primary characteristic of a substance that is lipid soluble?
What is the primary limitation on the size of cells?
What is the primary limitation on the size of cells?
Which of the following would increase the rate of diffusion?
Which of the following would increase the rate of diffusion?
What is the primary factor that influences the movement of ions across the cell membrane?
What is the primary factor that influences the movement of ions across the cell membrane?
What is the role of the selective permeability of the membrane?
What is the role of the selective permeability of the membrane?
What is the analogy used to describe the ability of membranes to separate and store charge?
What is the analogy used to describe the ability of membranes to separate and store charge?
What is the characteristic of the concentration of Na+ and K+ ions across the cell membrane?
What is the characteristic of the concentration of Na+ and K+ ions across the cell membrane?
What percentage of resting energy do cells use to maintain concentration and electrical gradients?
What percentage of resting energy do cells use to maintain concentration and electrical gradients?
What is the direction of net water movement through a selectively permeable membrane?
What is the direction of net water movement through a selectively permeable membrane?
What determines the permeability of a cell membrane to water?
What determines the permeability of a cell membrane to water?
What is the term for the pressure applied to a solution to prevent the inward flow of water across a semi-permeable membrane?
What is the term for the pressure applied to a solution to prevent the inward flow of water across a semi-permeable membrane?
What is the effect of differences in osmolarity on water movement across membranes?
What is the effect of differences in osmolarity on water movement across membranes?
What is the characteristic of Pf, the permeability of aquaporins?
What is the characteristic of Pf, the permeability of aquaporins?
Flashcards are hidden until you start studying
