Cell Boundaries

Question 1

Function of cell wall (2)

Answer 1

• support the cell

* protection against mechanical injury

Question 2

what is the plasmodesmata

Answer 2

microscopic channels which transverse the cell walls of plant cells enabling transport and communication between them

Question 3

Functions of the cell membrane (3)

Answer 3

• semi permeable
• encloses cell
• cellular immunity

Question 4

what is the fluid mosaic model?

Answer 4

describes the structure of the plasma membrane as a mosaic of components -> including phospholipids, cholesterol, proteins and carbs -> gives the membrane a fluid character

Question 5

Describe the phospholipids in the cell membrane

Answer 5

lipid molecules with a hydrophilic “head” region around the ionic phosphate group and long hydrophobic hydrocarbon tail that form a bilayer in aqueous solutions

Question 6

Describe glycolipids in the cell membrane

Answer 6

Lipids that have a carbohydrate chain attached to them

The carbohydrate chain is attached to the outside of the cell and is part of the cell recognition system

Question 7

Describe the proteins in the cell membrane

Answer 7

• Integral proteins and Peripheral proteins

* can form temporary and permanent channels in the membrane allowing different molecules to pass in & out of the cell

Question 8

Describe glycoproteins in the cell membrane

Answer 8

• proteins that have a carbohydrate chain attached to them

carbohydrate chains sticks out of the outside cell and is part of the cell recognition system