Lecture #19 - Membrane channels and transporters

Question 1

Transport of non-polar molecules is dependent on _____ and ______ _____

1. Is a more hydrophobic molecule less permeable?
2. Will a hydrophobic molecule move slower or faster if it has a larger concentration gradient?

Answer 1

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Question 2

Lipid bilayer represents an ____ ____ for polar molecules so to lower this, proteins make holes in the membranes

Answer 2

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Question 3

Channels:

1. Fast or not? How many molecules per second?
2. Can be ____ or gated

Answer 3

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Question 4

Transporters:

1. Can they be open to both intra and extracellular space?
2. How many molecules per second? Why?
3. Are they selective?
4. Are they like enzymes? How

Answer 4

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Question 5

Define all these:

1. Non-mediated
2. Mediated
3. Passive
4. Active
5. Co-transport
   - symport
   - antiport

Answer 5

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Question 6

Explain how Na/K pump works

Answer 6

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