lecture 4: The Plasma Membrane

Question 1

What is the plasma Membrane made of?

Answer 1

• Hydrophilic heads that face the inside and outside of the cell
• Hydrophobic tails that face each-other

Question 2

What is the outside of the cell called?

Answer 2

Extracellular fluid (ECF)

Question 3

What is the inside of the cell called?

Answer 3

Intracellular fluid (ICF)

Question 4

True or False
The plasma membrane will die if it loses it’s integrity (aka theres holes in it)

Answer 4

True

Question 5

The plasma membrane is closer in consistency to butter or olive oil?

Answer 5

olive oil meaning it’s very fluid

Question 6

What is Cholesterol is respect to the fluid mosaic model? (3)

Answer 6

• wedged in between the tails
• they are hydrophobic
• add to fluidity

Question 7

Where are Carbohydrates is respect to the fluid mosaic model? (2)

Answer 7

• bound to the lipids
• bound directly to the plasma membrane

Question 8

What do proteins do in the fluid mosaic model? and where are they? (4)

Answer 8

• allows things in and out
• some can be channels
• either wedged on the outside
• some go through the entire membrane

Question 9

What are channels and what do they do?

Answer 9

• protein with a large hollow tube allowing things inside and out
• allows movement of smaller molecules (less than 0.8nm)
• allows the movement of ions because charger molecules cannot pass freely

Question 10

What are carrier molecules?

Answer 10

• they transport specific substances
• carries relatively larger molecules
  ie. glucose

Question 11

What are Docking-marker acceptors?

Answer 11

• proteins that are in the inner side of the plasma membrane
• they are responsible to accept other docking-markers that will come it

Question 12

What are membrane-bound enzymes?

Answer 12

• they have a catalytic functions meaning they speed up reactions
• they are attached to the plasma membrane to signal that their job is completed or. being completed

Question 13

What are receptors?

Answer 13

they are a membrane protein that are specific to specific molecules
ie. glucose receptors

Question 14

What are cell adhesion molecules? (CAMS)

Answer 14

used for cellular communication but they also allows us to stick together

Question 15

What are Peripheral proteins?

Answer 15

proteins that stick to one side of the plasma membrane either the extracellular side or the intercellular side