General Paper 2 Quick-fire questions

Question 1

Describe a biochemical test to determine if a substance contained proteins

Answer 1

Biuret test:

1. Add Biuret solution
2. Positive result = LILAC

Question 2

Describe a biochemical test to determine the presence of lipids

Answer 2

Emulsion test:

1. Add ethanol to the sample
2. Shake
3. Add water (to ensure all lipids have dissolved)
4. Shake
5. Positive result = MILKY WHITE

Question 3

Describe a biochemical test to test the presence of starch in a sample

Answer 3

1. Add Iodine solution

2. Positive result= BLUE/BLACK

Question 4

Describe a biochemical test to determine the presence of reducing sugars

Answer 4

Benedict test:

1. Add Benedict’s solution to sample
2. Heat
3. Positive result = ORANGE/BRICK RED

Question 5

Describe a biochemical test to determine presence of non-reducing sugars

Answer 5

1. Add Hydrochloric acid and heat to break bonds
2. Neutralise using an alkali
3. Add Benedict’s solution to sample
4. Heat
5. Positive result = ORANGE/BRICK RED

Question 6

Explain why ATP is better than glucose as an immediate energy source for cell metabolism

Answer 6

• Only takes a single reaction to release the energy which is much quicker than glucose
• Releases small, manageable amounts at a time
• Cannot pass out of cells

Question 7

What does the Standard Deviation show?

Answer 7

1. Shows spread around the mean
2. If overlap occurs = no significant difference
3. so therefore there is less variability

Question 8

Explain why a logarithmic scale (Log-10) was used

Answer 8

Makes it easier to plot large ranges in values on a graph

Question 9

What is the equation for Respiration?

Answer 9

C6H12O6 + 602 > 6CO2 + 6H2O + Energy

Question 10

What is the equation for Photosynthesis?

Answer 10

6CO2 + 6H20 + Energy > C6H12O6 +6o2

Question 11

A gene that slows the rate of cell division by producing proteins that stop cells dividing or cause them to self-destruct

Answer 11

Tumour-suppressor gene

Question 12

The response of light to a directional stimulus

Answer 12

Tropism

Question 13

A type of RNA that carries the amino acids used to make proteins

Answer 13

tRNA