30 Questions
Which type of transport protein changes shape during the transport process?
Carrier proteins
What is the process called when molecules are transported against their concentration gradient?
Active transport
Which type of transport protein requires the input of energy?
Pumps
What is the name of the glucose transporter that increases membrane permeability to glucose?
GLUT – 1
Which type of transport protein allows substances that would not otherwise cross the membrane to pass through?
Channels
What is the term for the concentration and charge gradient collectively?
Electrochemical gradient
What is the term for the passive transport of substances that would not otherwise cross the membrane?
Facilitated diffusion
Which type of transport protein allows ions to diffuse through down their electrochemical gradients?
Channels
What is the name of the membrane protein that uses ATP to transport Na+ and K+ against their concentration gradients?
Sodium – potassium pump
What is the term for the process that makes it possible for cells to engage in secondary active transport?
Diffusion gradient
Which of the following best describes the structure of plasma membranes?
Plasma membranes are made up of selectively permeable bilayers of phospholipids.
What is the term used to describe the movement of water across a plasma membrane?
Osmosis
What is the main function of membranes in cells?
All of the above
What happens to phospholipids when placed in water?
They form lipid bilayers
What is the permeability of phospholipid bilayers?
Selective permeability
Which type of molecules move across phospholipid bilayers quickly?
Small or nonpolar molecules
What is the term used to describe the hydrophilic and hydrophobic regions of phospholipids?
Amphipathic
What is the role of membrane proteins in the passage of substances across the plasma membrane?
They facilitate the passage of substances
What is the term used to describe the formation of phospholipid bilayers without the input of energy?
Spontaneous
What is the function of phospholipids in relation to water molecules?
Phospholipids interact with water molecules
Which of the following factors can influence the behavior of the cell membrane?
Number of double bonds between the carbons in the phospholipid's hydrophobic tail
Which of the following statements about bond saturation and membrane permeability is true?
Unsaturated hydrocarbon chains have at least one double bond
Which of the following factors can decrease membrane permeability?
Increasing the length of the phospholipid tails
Which of the following statements about membrane fluidity is true?
Membrane fluidity is a function of temperature and the structure of the hydrocarbon tails
Which of the following is a form of passive transport?
Diffusion
What happens when there is a difference in solute concentration across a membrane?
Molecules and ions move randomly from high to low concentration regions
Which of the following statements about osmosis is true?
Water moves from regions of high solute concentration to low solute concentration
What happens to a cell in a hypertonic solution?
The cell will shrink
Which of the following is a characteristic of the fluid-mosaic model of membrane structure?
Phospholipids provide the basic membrane structure
What are integral proteins?
Proteins that span the membrane
Test your knowledge on cell membranes and their key concepts, including phospholipids, selective permeability, diffusion, osmosis, and membrane proteins.
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