Insane in the Membrane

If this was a diagram of the cell surface membrane, which letter would represent the cell's interior?

• B

• G

Which letter represents a cholesterol molecule?

• A

• C

• E

• F

• I

Which letter represents a phospholipid molecule?

• A

• C

• E

• F

• I

Which letter represents part of a glycoprotein?

• A

• C

• E

• F

• I

Which structure regulates the density of the membrane and therefore influences the membrane's permeability?

• A

• C

• E

• F

• I

Which structures are important in cell signaling and recognition? Select all that apply.

• A

• C

• E

• F

• H

What is this molecule?

• phospholipid

• cholesterol

• glucose

• triglyceride

• Adenine (a DNA base)

The highlighted variable region of these 7 amino acids is likely to be (select all that apply):

• polar

• non-polar

• hydrophobic

• hydrophilic

• ionic

Solute Q moves across the membrane via protein channels. Solute R moves by simple diffusion. It is reasonable to conclude that:

• Solute Q is lipid soluble

• Solute Q saturates the protein channels

• As temperature decreases, the gradient of the graph for solute R will increase

• As the cell uses solute R, its rate of movement will decrease

This structure is a porin. The function of the porin is

• Stabilise the plasma membrane by binding with phospholipid tails

• Move substances across the membrane against their concentration gradient

• Facilitate the diffusion of hydrophilic substances across the membrane

• Active transport of water molecules