3.1 Biological Molecules Flashcards Preview

AQA A Level Biology (yr 12 content) > 3.1 Biological Molecules > Flashcards

Flashcards in 3.1 Biological Molecules Deck (8)
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1
Q

What are monomers?

A

small units from which larger molecules are made

2
Q

What are polymers?

A

Molecules made from a large number of monomers joined together

3
Q

Give some examples of monomers

A
  • monosaccharides
  • amino acids
  • nucleotides
4
Q

Give some examples of polymers

A
  • Polysaccharides
  • protein
  • DNA
5
Q

What happens in a condensation reaction?

A

two molecules are joined together with the formation of a chemical bond where water is eliminated (produces water)

6
Q

What happens during hydrolysis reaction?

A

Breaks the chemical bond between two molecules using a water molecule.

7
Q

Test for reducing sugar

A

1) add Benedicts reagent to sample and hear in water bath that’s been brought to the boil.
2) positive= colour changed to form a brick red precipitate ( can be green yellow orange too)
3) Negative= remains blue

8
Q

Test for non reducing sugar

A

1) add dilute hydrochloride acid to sample and heat in water bath
2) neutralise it with sodium hydrogen carbonate
3) add benedicts and heat again in water bath
4) positive= colour Change
Negative= remain blue