AQA BIOLOGY A LEVEL PAPER 1
EXAMINATION TEST 7402 FULL QUESTIONS
ANSWERS GRADED A+
◉ Polymers. Answer: Long complex molecules consisting of chain of
identical monomers.
◉ Condensation Reactions. Answer: Forming a chemical bond
between monomers and releasing a molecule of water.
◉ Hydrolysis. Answer: Breaking down polymers into monomers
with the addition of water
◉ Sugars. Answer: All carbohydrates contain Carbon, Hydrogen and
oxygen.
The monomers for carbohydrates are monosaccharides e.g. glucose,
fructose and galactose (reducing sugars).
◉ Glucose. Answer: Is a hexose sugar with six carbons in each
molecule. There are two types: alpha and beta glucose. These are
isomers which means the same chemical formula, but a different
molecular arrangement.
, ◉ Disaccharides. Answer: A disaccharide forms when two
monosaccharides join together through a condensation reaction.
This forms a glycosidic bond.
Glucose + Glucose = maltose
Glucose + Fructose = sucrose
Glucose + Galactose = lactose.
◉ Benedict's Test for Reducing Sugars. Answer: 1.Add Benedict's
reagent
2.Bring to Boil
3.Forms a brick red precipitate if positive.
To find how much sugar there is, filter the solution and weigh the
precipitate
◉ Non Reducing Sugars Benedict's Test. Answer: 1. Initial Benedict's
Test - negative.
2. With a new sample, add dilute HCl to the sample and boil.
3. Neutralise with sodium hydrogen carbonate.
4. Repeat Benedict's
EXAMINATION TEST 7402 FULL QUESTIONS
ANSWERS GRADED A+
◉ Polymers. Answer: Long complex molecules consisting of chain of
identical monomers.
◉ Condensation Reactions. Answer: Forming a chemical bond
between monomers and releasing a molecule of water.
◉ Hydrolysis. Answer: Breaking down polymers into monomers
with the addition of water
◉ Sugars. Answer: All carbohydrates contain Carbon, Hydrogen and
oxygen.
The monomers for carbohydrates are monosaccharides e.g. glucose,
fructose and galactose (reducing sugars).
◉ Glucose. Answer: Is a hexose sugar with six carbons in each
molecule. There are two types: alpha and beta glucose. These are
isomers which means the same chemical formula, but a different
molecular arrangement.
, ◉ Disaccharides. Answer: A disaccharide forms when two
monosaccharides join together through a condensation reaction.
This forms a glycosidic bond.
Glucose + Glucose = maltose
Glucose + Fructose = sucrose
Glucose + Galactose = lactose.
◉ Benedict's Test for Reducing Sugars. Answer: 1.Add Benedict's
reagent
2.Bring to Boil
3.Forms a brick red precipitate if positive.
To find how much sugar there is, filter the solution and weigh the
precipitate
◉ Non Reducing Sugars Benedict's Test. Answer: 1. Initial Benedict's
Test - negative.
2. With a new sample, add dilute HCl to the sample and boil.
3. Neutralise with sodium hydrogen carbonate.
4. Repeat Benedict's
