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Flashcards in Membrane proteins Deck (18)
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1
Q

What are the tails of a lipid bilayer described as?

A

hydrophobic

2
Q

what are the heads of a lipid bilayer described as?

A

hydrophilic

3
Q

what are integral proteins?

A

proteins on the outer or inner surface of the membrane

4
Q

what are examples of integral proteins

A

channel proteins, receptors and transporter proteins

5
Q

what do peripheral proteins have fewer of compared to integral proteins?

A

hydrophobic R groups interacting with the bilayer

6
Q

how are peripheral proteins held in place?

A

charged or polar amino acids R groups or hydrophobic interactions

7
Q

Describe facilitated diffusion

A

passive transport of substance across the membrane through specific transmembrane proteins

8
Q

describe active transport with conformational change

A

requires energy from hydrolysis ATP

eg. sodium potassium pump

9
Q

describe carrier proteins

A

active transport

conformational change to release proteins

10
Q

describe channel proteins

A

facilitated diffusion

doesn’t require a conformational change

11
Q

what are gated channel proteins?

A

some channels are gated and respond to a stimulus to allow a conformational change to allow or prevent diffusion
controlled by the binding of signalling molecules

12
Q

what are voltage channel proteins

A

a different of voltage respond to a stimulus
conformational change to open/close
controlled by ion concentration

13
Q

what do regions of hydrophobic R groups allow?

A

strong hydrophobic interactions that hold integral membrane proteins proteins within the phospholipid bilayer

14
Q

what are some integral membrane proteins also known as?

A

transmembrane proteins

15
Q

what do peripheral membrane proteins have on their surface and what are they bound to?

A

hydrophilic R groups and

bound to surface membranes by ionic and hydrogen bond interactions

16
Q

what do peripheral membrane proteins interact with?

A

surfaces of integral membrane proteins

17
Q

what’s the difference between channel proteins and transported proteins?

A

channel proteins does not require a conformational change

18
Q

describe transported proteins

A

facilitated diffusion

requires a conformational change