1.3 Membrane Proteins

Question 1

Integral membrane proteins are found …

Answer 1

In the phospholipid bilayer

Question 2

Integral membrane proteins have extensive interactions with

Answer 2

The hydrophobic region of membrane phospholipids

Question 3

Integral: regions of hydrophobic R groups allow

Answer 3

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

Question 4

Some integral membranes are transmembrane proteins this means:

Answer 4

They span the entirety of the cell membrane

Question 5

What do many peripheral membrane proteins interact with

Answer 5

The surfaces of integral membrane proteins

Question 6

What type of R groups do peripheral membrane proteins have on their surface

Answer 6

Hydrophilic

Question 7

Peripheral membrane proteins are bound to the surface of membranes by

Answer 7

Mainly ionic and hydrogen bond interactions

Question 8

The phospholipid bilayer is a barrier to:

Answer 8

Ions and most uncharged polar molecules

Question 9

CO2 and oxygen can pass through the phospholipid bilayer via

Answer 9

Diffusion

Question 10

Define facilitated diffusion

Answer 10

The passive transport of substances across a membrane through specific transmembrane proteins

Question 11

What are the two channel types

Answer 11

Ligand gated channel, voltage gated channel

Question 12

Describe a channel

Answer 12

A multi subunit protein with the subunits arranged to form water filled pores that extent across the membrane

Question 13

What are ligand gated channels controlled by

Answer 13

The binding of signal molecules

Question 14

What are voltage gated channels controlled by

Answer 14

The changes in ion concentration

Question 15

Describe pump proteins

Answer 15

Activate transport transfers substances across the membrane against their concentration gradient
Transporter proteins coupled to an energy source