Question

sort the phrases into the appropriate bins depending on whether they are true only for channels, true only for carrier proteins, or true for both channels and carriers. (view available hint(s)) adapted from biology by campbell and reece © 2008 pearson education, inc. bins: only channels, only carriers, both channels and carriers. phrases: are integral membrane proteins, transport primarily small polar organic molecules, provide a hydrophilic path across the membrane, allow water molecules and small ions to flow quickly across the membrane, undergo a change in shape to transport solutes across the membrane, transport solutes down a concentration or electrochemical gradient, provide a continuous path across the membrane.

Explanation:

Only Channels:

• are integral membrane proteins
• allow water molecules and small ions to flow quickly across the membrane
• provide a hydrophilic path across the membrane
• provide a continuous path across the membrane

Only Carriers:

• transport primarily small polar organic molecules
• undergo a change in shape to transport solutes across the membrane

Both Channels and Carriers:

• transport solutes down a concentration or electrochemical gradient

for Each Category:

• Only Channels: Channel proteins are integral, form continuous hydrophilic paths, and let small ions/water pass rapidly.
• Only Carriers: Carrier proteins change shape to transport polar organics (e.g., glucose) and move solutes down gradients (but this is also true for channels, so the "shape change" and "polar organics" are unique to carriers here).
• Both Channels and Carriers: Both facilitate passive transport down concentration/electrochemical gradients (channels via diffusion, carriers via conformational change - but the gradient - driven transport is shared).

Answer:

for Each Category:

• Only Channels: Channel proteins are integral, form continuous hydrophilic paths, and let small ions/water pass rapidly.
• Only Carriers: Carrier proteins change shape to transport polar organics (e.g., glucose) and move solutes down gradients (but this is also true for channels, so the "shape change" and "polar organics" are unique to carriers here).
• Both Channels and Carriers: Both facilitate passive transport down concentration/electrochemical gradients (channels via diffusion, carriers via conformational change - but the gradient - driven transport is shared).