General Paper 2 Quick-fire questions Flashcards Preview

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Flashcards in General Paper 2 Quick-fire questions Deck (13):
1

Describe a biochemical test to determine if a substance contained proteins

Biuret test:
1. Add Biuret solution
2. Positive result = LILAC

2

Describe a biochemical test to determine the presence of lipids

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

3

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

1. Add Iodine solution
2. Positive result= BLUE/BLACK

4

Describe a biochemical test to determine the presence of reducing sugars

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

5

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

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

6

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

- 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

7

What does the Standard Deviation show?

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

8

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

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

9

What is the equation for Respiration?

C6H12O6 + 602 > 6CO2 + 6H2O + Energy

10

What is the equation for Photosynthesis?

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

11

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

Tumour-suppressor gene

12

The response of light to a directional stimulus

Tropism

13

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

tRNA