Molecules And Movement Of Substances

Question 1

Identify the elements present in Carbohydrates

Answer 1

CHO
Carbon
Hydrogen
Oxygen

Question 2

Identify the elements present in proteins

Answer 2

CHON
Carbon
Hydrogen 
Oxygen 
Nitrogen

Question 3

Identify the elements present in lipids

Answer 3

CHO
Carbon
Hydrogen
Oxygen

Question 4

What are carbohydrates, proteins, and lipids are made of?

Answer 4

They are large molecules made from smaller basic units

Carbs- maltose, glucose etc (simple sugars)

Proteins- amino acids

Lipids- fatty acids and glycerol

Question 5

Food test for glucose

Answer 5

Water bath at 75c

Benedict’s solution

From blue to brick red

(Or green in low concentrations)

Question 6

Test for Proteins

Answer 6

Biuret solution

Shake gently

Blue to pink or purple

Question 7

Test for lipids

Answer 7

Add Sudan III stain solution

Gently shake

Will separate out, with a bright red layer

Question 8

Test for starch

Answer 8

Add iodine solution

Shake gently

Brown/ orange to blue-black

Question 9

What happens to an enzyme when denatured?

Answer 9

The active site changes shape

Question 10

How to investigate temperatures effect on enzyme activity

Answer 10

Breaking down hydrogen peroxide into oxygen and water

Heat with water bath, collect O in measuring cylinder upside down in water

Question 11

4 Factors that effect the rate movement of substances in and out of cells

Answer 11

SA: Vol ratio

Distance

Temperature

Concentration gradient

Question 12

Investigate diffusion and osmosis in living systems

Answer 12

Potato cylinders in different concentrations of water and sugar solution

Measure cylinders

If water leaves the cell, they will shrink

Question 13

Investigate diffusion and osmosis in non-living systems

Answer 13

Visking tubing over the end of a thistle funnel

Put sugar solution in funnel

Put water in beaker

Water moves through tubing by osmosis, forcing solution up the glass tube