Lecture #18 - Membrane Lipids and Proteins Flashcards
What do membranes allow? (2)
- Membranes allow compartments (separation of function)
2. Can generate conc gradients
The hydrophobic hydrocarbon tails are ___-____ carbon long _____ acids
What two types are these?
Why are they called “amphipathic”?
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What do amphipathic molecules form in aqueous environments?
When would this happen if you put the molecules in water?
Bilayers - it’s energetically favourable
Spontaneously
- Two fatty acids + phosphate = ?
- Describe the basics of ^ (where is the backbone from, what’s the polar part and what’s the non polar part etc).
- What might the phosphate have on it?
- What allows the functional diversity?
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Membrane fluidity:
What three things is it affected by and how is it affected by them?
So melting point is a marker for what? How does this work?
What happens to membrane fluidity if you increase the FA length?
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Membrane fluidity:
What three things is it affected by and how is it affected by them?
So melting point is a marker for what? How does this work?
What happens to membrane fluidity if you increase the FA length? What about if you increase the number of kinks? Why?
Why = because if you introduce kinks, you make it more disordered and if you have longer, you increase hydrophobic interactions (they stabilise protein structures)
How do fish respond to varying temperatures?
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How did they prove that ish moved around in the membrane?
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What are 6 functions of membrane proteins?
Which of the four are “integral”
What’s one way the peripheral protein can be held in place?
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How are proteins that are membrane spanning attached to bilayer?
How are partially embedded proteins attached to bilayer?
What else can be used to anchor fatty acids? What is this process called?
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Are the two sides of a membrane the same? Why or why not?
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When are proteins often modified by adding sugars?
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