Biological molecules AQA AS Biology: TEST ON ALL 8 TOPICS

This is a quick-fire test on the 8 topics I have written based on the AQA spec which includes as a reminder

  • Carbohydrates
  • Lipids
  • Proteins
  • Many proteins are enzymes
  • Nucleic acids
  • ATP
  • Water
  • Inorganic ions
?
This biological molecule is found in the lipid bilayer which has hydrophobic tails and hydrophillic head
Phospholipid
1 of 14
The DNA replication which produces two DNA molecules where each one has one original strand and one new strand
Semi conservative replication (Semi-conservative replication is still right)
2 of 14
The equation for working out hydrogen ion concentration or pH value
[H+]= 10^-pH (or anything similar)
3 of 14
This ion has many uses one of which includes making nucleotides
Phosphate ions (or anything similar)
4 of 14
A reagent to give a blue-black colourisation. What is it? What does it test for?
Iodine Potassium solution (or Iodine) and it tests for the presence of starch
5 of 14
This bond is created when two alpha glucose molecules are joined together. Can you also name the reaction?
Glycosidic bond or 1,4 alpha glycosidic bond (this is more likely to be marked right). The reaction is a condensation reaction
6 of 14
What is the test for lipids? Observation if positive?
Add ethanol and shake. Add an equal amount of cold water. If positive a white suspension should be observed (or anything similar will be accepted)
7 of 14
I add Benedict's reagent to a solution and heat it. What am I testing for? What would be the observation if it is a positive test?
Reducing sugars (glucose, fructose, galactose, maltose and lactose will be better answers) and a brick red precipitate will be observed (or blue to brick red will be fine)
8 of 14
I add biuret A and biuret B (KOH and copper sulphate solution) to a mixture and there is no positive result. What was I testing for and what would be the observation if it was a positive result?
Testing for proteins and it would be a lilac colourisation if it were to be a positive result
9 of 14
What two extra steps would I take if I were to be testing for a non reducing sugar? Can you also name the non reducing sugar?
1. Need to add HCl and boil and 2. Need to add NaOH to neutralise
10 of 14
This molecule is insoluble and does not draw water in by osmosis. It is compact and can be easily hydrolysed into alpha glucose molecules which is used in respiration. What am I describing?
Starch
11 of 14
This molecule is folded into an alpha helix or beta pleated sheet. What grade (primary, secondary, tertiary or quaternary) is this molecule?
Secondary
12 of 14
What is the difference between glycogen and starch?
Glycogen has shorter chains, more branched and is more readily hydrolysed than starch. (vice versa wil be fine)
13 of 14
Why is cellulose successful at keeping the cell rigid
The straight unbranched chains running parallel amongst one another have hydrogen bonds between them to make it strong. Microfibrils which are cellulose molecules grouped together stop the cell from bursting.
14 of 14

Other cards in this set

Card 2

Front

The DNA replication which produces two DNA molecules where each one has one original strand and one new strand

Back

Semi conservative replication (Semi-conservative replication is still right)

Card 3

Front

The equation for working out hydrogen ion concentration or pH value

Back

Preview of the front of card 3

Card 4

Front

This ion has many uses one of which includes making nucleotides

Back

Preview of the front of card 4

Card 5

Front

A reagent to give a blue-black colourisation. What is it? What does it test for?

Back

Preview of the front of card 5
View more cards

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