17 Questions
What is the main function of the phospholipid bilayer in cell membranes?
Acting as a selectively permeable barrier
Which of the following is NOT one of the 4 basic mechanisms for transport through cell membranes?
Enzyme Digestion
In the context of solutions, what is the role of a solvent?
Doing the dissolving (substance the solute is dissolved in)
What type of transport mechanism involves moving substances against their concentration gradient?
Active Transport
Which process allows the movement of large quantities of substances into or out of cells at once?
Bulk Transport
What term is used to describe the type of transport facilitated by uniporters?
Facilitated transport
How does the rate of facilitated diffusion compare to passive diffusion?
Facilitated diffusion is slower
Which transporter is responsible for transporting glucose into most mammalian cells?
GLUT1
What is the main function of the Na+/K+ ATPase in animal cells?
Maintain intracellular Na+ and K+ concentrations
Which type of transport occurs via a limited number of uniporters?
Facilitated diffusion
What type of transport is accelerated by uniporters, similar to enzymes?
Facilitated diffusion
What is the function of V-class H+ ATPases in cells?
Pumping protons across lysosomal and vacuolar membranes
Which family of proteins is responsible for transporting a wide variety of substrates?
ABC superfamily
What is the importance of the AE1 protein in erythrocytes?
Crucial to CO2 transport
How do most protozoans control cell volume?
By using a contractile vacuole
What is the role of tight junctions in epithelia?
Sealing off body cavities
How do excitatory neurotransmitters affect the postsynaptic membrane?
Depolarize the membrane towards the threshold level
Learn about the 4 basic mechanisms of transport through cell membranes: Diffusion, Osmosis, Active Transport, and Bulk Transport. Understand the concepts of solute and solvent in the context of cell membrane transport.
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