Proteins
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How are proteins formed
condensation reaction
What colour does acidified potassium dichromate become when its oxidised
orange—- blue/green
What does tollens reagent becomes when its oxidised
forms a silver mirror
What colour does benedicts reagent turn when its oxidised
blue—- orange/red
Which gas reacts with edible oils to give food a rancid flavour
oxygen
What test could be used to distinguish fats from oils
unsaturated compounds quickly decolourise bromine solution
Glycerol can be obtained from fats by which process
hydrolysis
Name the type of compound produced by the hydrolysis of a protein during digestion
amino acids
What can be used to tell the difference between an aldehyde and a ketone?
Aldehydes will react with acidified potassium dichromate while ketones will not.
What happens when proteins denature
hydrogen bonds are broken
What name is given to the link in protein molecules that holds the amino acid molecules together
amide/peptide links
What is meant by the term denatured
changes shape
Explain why protein chains unwind when they are heated
heat breaks the hydrogen bonds
State what is meant by an essential amino acid.
Amino acid that must be obtained from the diet.
State the term used for the process of breaking down a protein by enzyme action in the body
digestion
State why our bodies need amino acids
to build proteins
State the name of the functional group found in all enzyme
peptide link
Describe the breakdown of proteins
peptide links are broke down to form amino acids
Explain what happens to an enzyme when it is cooked
enzyme becomes denatures and hydrogen bonds are broken
Why are proteins needed in our diet
for growth and repair of body tissue
What colour does fehlings reagent turn when it is oxidised
blue to brick red
Explain fully what happens when a protein is denatured
hydrogen bonds are broken and the protein changes shape
What happens when proteins in food are denatured
texture changes when it is cooked
State the name of the digestion process where enzymes break down proteins into amino acids
Hydrolysis