Chapter 5: 5.1

Question 1

What is the function of membranes within a cell?

Answer 1

• Acts as barrier between the cell and the cell’s environment which then controls how substances can leave and enter the cell ( substances can move through process of osmosis, active transport and diffusion)
• Allows recognition by other cells (e.g. erythrocyte)
• Allows cell communication (known as cell signalling)

Question 2

What is compartmentalization?

Answer 2

is the belief that there are different areas (compartments) in a cell with lots of different function

Question 3

What is a plasma membrane?

Answer 3

The plasma membrane is the cell surface membrane which separate cells from its external environment and its internal environment

Question 4

What is the structure of the membranes like?

Answer 4

• membrane have they have a phospholipid bilayer
• membrane have hydrophobic phosphate heads of the phospholipids form outer surface of a membranes
• membrane have hydrophilic core = which consists of the sandwiching of the fatty acid tails of the phospholipids inside the membrane

Question 5

What is the phospholipid bilayer suited for the membrane?

Answer 5

Because the outer surfaces of the hydrophobic phosphate heads can interact with water

Question 6

NOT A FLASHCARD

Answer 6

You need to know what the model of fluid-mosaic model looks like and able to label the model

Question 7

What is the function of internal membranes?

Answer 7

• internal membranes are act as a site of were chemical reactions take place
• internal membranes are can act as vesicles to transport substances between different areas of the cell
• internal membranes are can control what substances goes in and out of the organelles (by being partially membrane)