Membrane Transport & etc

Question 1

Relate selective permeability and the cell membrane

Answer 1

The cell membrane is a selective permeability membrane that allows the passage of water in some selected solutes

Question 2

What is the Fluid Mosaic model?

Why is it called mosaic?

Answer 2

Model of the cell membrane structure
-being made up of many separate and distinct components not bonded to each other so as to retain fluid property

Diverse types of proteins, each with their own function

Question 3

Define fluidity

What affects fluidity?

Answer 3

• Reflects the ability of molecules to diffuse freely in the plane of the bilayer
• both lipids and proteins can move laterally or spin

There affected by chemistry of fatty acid tails; unsaturated

Question 4

Saturated

Answer 4

Fatty acid containing no double bonds between carbon skeleton; hydrocarbon tail is straight in form

Question 5

Unsaturated

Answer 5

Fatty acid containing 1+ double bonds between carbon atoms in the carbon skeleton; hydrogen tail is kinked if the double bond is in the cis form

Question 6

What are the 3 transport protein

Answer 6

Uniport
Symport
Antiport

Question 7

Uniport

Answer 7

A single type of substance is transported in a single direction along its concentration gradient
—->

Question 8

Symport

Answer 8

2+ different substances are moved in the same direction

• —>
• —>

Question 9

Antiport

Answer 9

2 different substances are moved in opposite direction
—->
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