Membranes

Question 1

Hypotonic

Answer 1

Solution has a higher WP then cells

Question 2

Why is it called the fluid mosaic model

Answer 2

fluid - phospholipids are constantly moving
mosaic - proteins are randomly integrated in the model

Question 3

Role of glycoproteins in cells

Answer 3

-Binds to drugs/hormones/antibodies
-Stabilises the plasma membrane by forming hydrogen bonds with the plasma membrane
-Acts as antigens
-Ice crystals may also form and pierce the membrane

Question 4

Why were the cut sections of beetroot soaked in distilled water overnight

Answer 4

To make sure any released when cutting the beetroot were washed away

Question 5

Suggest a negative control that could be used in the beetroot investigation

Answer 5

Colorimetry analysis of the distilled water

Question 6

Explain how the structure of the plasma membranes of beetroot changes with increasing temperature

Answer 6

1) Increase in temperature increases the fluidity of the phospholipids in the beetroot plasma membranes
2) At temperatures above 40 degrees the membrane begins to break down and the proteins in the membrane begin to denature
3) The membrane surrounding the vacuole becomes more permeable with increasing temperature
4) This means that pigments leak out of the distilled water
5) The more pigments released the higher the absorbance reading

Question 7

Penicillin

Answer 7

Prevents some types of bacteria from synthesising their peptidoglycan wall

Question 8

How do betacyclins help lower bp

Answer 8

Contain nitrogenous compounds that produce nitric oxide which dilates the arteries