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Transport Mechanisms Through Cell Membranes

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Transport Mechanisms Through Cell Membranes

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Questions and Answers

What is the main function of the phospholipid bilayer in cell membranes?

Acting as a selectively permeable barrier (correct)

Preventing any materials from entering or leaving the cell

Supporting active transport mechanisms

Allowing only water-soluble molecules to enter and leave the cell

Which of the following is NOT one of the 4 basic mechanisms for transport through cell membranes?

Enzyme Digestion (correct)

Diffusion

Bulk Transport

Active Transport

In the context of solutions, what is the role of a solvent?

Facilitating osmosis

Acting as a barrier around cells

Being dissolved by the solute

Doing the dissolving (substance the solute is dissolved in) (correct)

What type of transport mechanism involves moving substances against their concentration gradient?

Active Transport Signup and view all the answers

Which process allows the movement of large quantities of substances into or out of cells at once?

Bulk Transport Signup and view all the answers

What term is used to describe the type of transport facilitated by uniporters?

Facilitated transport Signup and view all the answers

How does the rate of facilitated diffusion compare to passive diffusion?

Facilitated diffusion is slower Signup and view all the answers

Which transporter is responsible for transporting glucose into most mammalian cells?

GLUT1 Signup and view all the answers

What is the main function of the Na+/K+ ATPase in animal cells?

Maintain intracellular Na+ and K+ concentrations Signup and view all the answers

Which type of transport occurs via a limited number of uniporters?

Facilitated diffusion Signup and view all the answers

What type of transport is accelerated by uniporters, similar to enzymes?

Facilitated diffusion Signup and view all the answers

What is the function of V-class H+ ATPases in cells?

Pumping protons across lysosomal and vacuolar membranes Signup and view all the answers

Which family of proteins is responsible for transporting a wide variety of substrates?

ABC superfamily Signup and view all the answers

What is the importance of the AE1 protein in erythrocytes?

Crucial to CO2 transport Signup and view all the answers

How do most protozoans control cell volume?

By using a contractile vacuole Signup and view all the answers

What is the role of tight junctions in epithelia?

Sealing off body cavities Signup and view all the answers

How do excitatory neurotransmitters affect the postsynaptic membrane?

Depolarize the membrane towards the threshold level Signup and view all the answers