Membranes

Question 1

Davison and Danielli proposed a _________

Answer 1

Sandwich model

Question 2

Singer and Nickolson

Answer 2

Revised model, proteins dispersed and inserted into phospholipid bilayer

Question 3

What does hypertonic mean?

Answer 3

Shrivelled - There is a higher concentration of saline solution outside the cell

Question 4

What does hypotonic mean?

Answer 4

Lysed (large) - There is a higher concentration of saline solution inside the cell

Question 5

What does isotonic mean?

Answer 5

Normal - There is the same concentration of saline solution inside the cell as there is outside the cell

Question 6

What is passive transport?

Answer 6

The moment of a solute down a gradient. Transport protein is not needed

Question 7

What is active transport?

Answer 7

Pumps solutes against their gradients. Takes energy to do process

Question 8

What is osmosis?

Answer 8

Spontaneous net movement of solvents across a semipermeable membrane

Question 9

What is Cotransport?

Answer 9

Coupled transport of two solutes. Same or opposite directions