Biological membranes

Question 1

What is used to control PH?

Answer 1

Buffer solution

Question 2

What does a colorimeter measure?

Answer 2

Absorbance

Question 3

How do you calibrate a colorimeter?

Answer 3

Use a cuvette of distilled water

Question 4

What type of movement is diffusion?

Answer 4

Passive

Question 5

What type of process is exocytosis?

Answer 5

Active (requires ATP)

Question 6

What is meant by water potential?

Answer 6

The likelihood of water molecules diffusing

Question 7

What water potential do isotonic solutions have?

Answer 7

Same water potential on either side of the membrane

Question 8

What plant measures diffusion/ membrane permeability?

Answer 8

Beetroot

Question 9

What plant measures osmosis?

Answer 9

Potato

Question 10

Where’s the isotonic point found on a graph?

Answer 10

Where the line of best fit crosses the x-axis

Question 11

What has the highest water potential?

Answer 11

A dilute solution with little solute

Question 12

What affects active transport rate?

Answer 12

Number of carrier proteins & surface area of membrane

Question 13

What’s the role of glycolipids?

Answer 13

Cell signalling

Question 14

What does PH change when not optimum?

Answer 14

Tertiary structure of membrane proteins

Question 15

What happens when there’s osmosis into the cell in plants (hypotonic)?

Answer 15

The protoplast swells and cell becomes turgid

Question 16

What happens when there’s osmosis into the cell in animals (hypotonic solution)?

Answer 16

Swell and burst (lysis of the cell)

Question 17

What happens when there’s osmosis out of the cell in plants (hypertonic)?

Answer 17

Protoplast shrinks and cell becomes flaccid then plasmolysis

Question 18

What happens when there’s osmosis out of the cell in animals (hypertonic)?

Answer 18

Shrinking & Crenation (shrivels) of the cell