•
AQA A Level Biology Paper 1
ACTUAL EXAM QUESTIONS
AND CORRECT ANSWERS
LATEST UPDATE
2026
WHAT TO FIND IN THIS EXAM
CASE STUDIES NGN STYLE QUESTIONS
BUTTERFLY QUESTION WITH ANSWERS
WELL, EXPLAINED ANSWERS
VERIFIED EXPLANATIONS AND ANSWERS
GRADE A+ ACTUAL EXAM
, •
2026/2027 Frequently Most Tested
Questions and 100% Accurate From Past
papers | Graded A+ , Reviewed and
Updated | 100% Guarantee Pass | Latest
Exam and Newest Version!!!
What is the process called when water is removed from reactants to join two molecules
together?
a. Hydrolysis
b. Condensation
c. Dehydration synthesis
d. Oxidation
✔️ Correct Answer: B
Rationale:
Condensation is the process in which water is removed from reactants to join two
molecules together (Option B). During condensation reactions, a covalent bond is formed
between two molecules, and a water molecule is released as a byproduct. This process is
essential for building polymers from monomers, such as linking amino acids to form
proteins, joining monosaccharides to form polysaccharides, and connecting nucleotides
to form nucleic acids. The removal of water allows the formation of new bonds, such as
peptide bonds, glycosidic bonds, or phosphodiester bonds.
Option A is incorrect because hydrolysis is the process of adding water to break a
chemical bond, which is the opposite of condensation. Option C is a synonym for
condensation but is less precise in standard biological terminology. Option D is incorrect
because oxidation involves the loss of electrons, not the removal of water.
What is the process called when water is added to break a chemical bond between two
molecules?
, •
a. Condensation
b. Dehydration synthesis
c. Hydrolysis
d. Phosphorylation
✔️ Correct Answer: C
Rationale:
Hydrolysis is the process in which water is added to break a chemical bond between two
molecules (Option C). The term "hydrolysis" literally means "water splitting." During
hydrolysis, a water molecule is consumed, and its components are used to break a
covalent bond. For example, during digestion, hydrolysis breaks down polymers into
monomers, such as breaking proteins into amino acids, polysaccharides into
monosaccharides, and nucleic acids into nucleotides. This process is essential for
metabolism and nutrient absorption.
Option A is incorrect because condensation removes water to form bonds, not break
them. Option B is a synonym for condensation. Option D is incorrect because
phosphorylation involves the addition of a phosphate group, not water.
How do you test for reducing sugars?
a. Add iodine solution and observe for blue-black color
b. Add Benedict's reagent, heat in a water bath at 95°C for 5 minutes, and observe for a
color change from blue to brick red
c. Add Biuret reagent and observe for a purple color
d. Mix with ethanol and water and observe for a cloudy white emulsion
✔️ Correct Answer: B
Rationale:
The test for reducing sugars involves adding Benedict's reagent to the sample, heating in
a water bath at 95°C for 5 minutes, and observing for a color change from blue to brick
red (Option B). Reducing sugars, such as glucose, fructose, and maltose, have free
aldehyde or ketone groups that can reduce the copper(II) ions in Benedict's reagent to
copper(I) oxide, which forms a brick-red precipitate. The intensity of the color change
indicates the concentration of reducing sugars present.
Option A is incorrect because iodine solution tests for starch, producing a blue-black
color. Option C is incorrect because Biuret reagent tests for proteins, producing a purple
, •
color. Option D is incorrect because the emulsion test detects lipids, producing a cloudy
white emulsion.
How do you test for non-reducing sugars?
a. Add Benedict's reagent directly and heat
b. Add iodine solution and observe for a blue-black color
c. Add dilute hydrochloric acid and heat, neutralize with sodium hydrogen carbonate,
then perform the Benedict's test
d. Mix with ethanol and water and observe for a cloudy white emulsion
✔️ Correct Answer: C
Rationale:
The test for non-reducing sugars involves adding dilute hydrochloric acid to the sample
and heating to hydrolyze the non-reducing sugar into reducing sugars (Option C). The
solution is then neutralized with sodium hydrogen carbonate to create a suitable pH for
the Benedict's test. The Benedict's test is then performed as usual. If a non-reducing
sugar such as sucrose was present, the hydrolysis will produce glucose and fructose
(both reducing sugars), resulting in a positive Benedict's test. Sucrose is the only
common non-reducing disaccharide.
Option A is incorrect because non-reducing sugars will not give a positive Benedict's test
without prior hydrolysis. Option B is incorrect because iodine tests for starch, not non-
reducing sugars. Option D is incorrect because the emulsion test detects lipids.
How do you test for starch?
a. Add Benedict's reagent and heat
b. Add iodine solution and observe for a blue-black color
c. Add Biuret reagent and observe for a purple color
d. Mix with ethanol and water and observe for a cloudy white emulsion
✔️ Correct Answer: B
Rationale:
The test for starch involves adding iodine solution to the sample and observing for a
blue-black color (Option B). Iodine solution (iodine in potassium iodide) reacts with the
AQA A Level Biology Paper 1
ACTUAL EXAM QUESTIONS
AND CORRECT ANSWERS
LATEST UPDATE
2026
WHAT TO FIND IN THIS EXAM
CASE STUDIES NGN STYLE QUESTIONS
BUTTERFLY QUESTION WITH ANSWERS
WELL, EXPLAINED ANSWERS
VERIFIED EXPLANATIONS AND ANSWERS
GRADE A+ ACTUAL EXAM
, •
2026/2027 Frequently Most Tested
Questions and 100% Accurate From Past
papers | Graded A+ , Reviewed and
Updated | 100% Guarantee Pass | Latest
Exam and Newest Version!!!
What is the process called when water is removed from reactants to join two molecules
together?
a. Hydrolysis
b. Condensation
c. Dehydration synthesis
d. Oxidation
✔️ Correct Answer: B
Rationale:
Condensation is the process in which water is removed from reactants to join two
molecules together (Option B). During condensation reactions, a covalent bond is formed
between two molecules, and a water molecule is released as a byproduct. This process is
essential for building polymers from monomers, such as linking amino acids to form
proteins, joining monosaccharides to form polysaccharides, and connecting nucleotides
to form nucleic acids. The removal of water allows the formation of new bonds, such as
peptide bonds, glycosidic bonds, or phosphodiester bonds.
Option A is incorrect because hydrolysis is the process of adding water to break a
chemical bond, which is the opposite of condensation. Option C is a synonym for
condensation but is less precise in standard biological terminology. Option D is incorrect
because oxidation involves the loss of electrons, not the removal of water.
What is the process called when water is added to break a chemical bond between two
molecules?
, •
a. Condensation
b. Dehydration synthesis
c. Hydrolysis
d. Phosphorylation
✔️ Correct Answer: C
Rationale:
Hydrolysis is the process in which water is added to break a chemical bond between two
molecules (Option C). The term "hydrolysis" literally means "water splitting." During
hydrolysis, a water molecule is consumed, and its components are used to break a
covalent bond. For example, during digestion, hydrolysis breaks down polymers into
monomers, such as breaking proteins into amino acids, polysaccharides into
monosaccharides, and nucleic acids into nucleotides. This process is essential for
metabolism and nutrient absorption.
Option A is incorrect because condensation removes water to form bonds, not break
them. Option B is a synonym for condensation. Option D is incorrect because
phosphorylation involves the addition of a phosphate group, not water.
How do you test for reducing sugars?
a. Add iodine solution and observe for blue-black color
b. Add Benedict's reagent, heat in a water bath at 95°C for 5 minutes, and observe for a
color change from blue to brick red
c. Add Biuret reagent and observe for a purple color
d. Mix with ethanol and water and observe for a cloudy white emulsion
✔️ Correct Answer: B
Rationale:
The test for reducing sugars involves adding Benedict's reagent to the sample, heating in
a water bath at 95°C for 5 minutes, and observing for a color change from blue to brick
red (Option B). Reducing sugars, such as glucose, fructose, and maltose, have free
aldehyde or ketone groups that can reduce the copper(II) ions in Benedict's reagent to
copper(I) oxide, which forms a brick-red precipitate. The intensity of the color change
indicates the concentration of reducing sugars present.
Option A is incorrect because iodine solution tests for starch, producing a blue-black
color. Option C is incorrect because Biuret reagent tests for proteins, producing a purple
, •
color. Option D is incorrect because the emulsion test detects lipids, producing a cloudy
white emulsion.
How do you test for non-reducing sugars?
a. Add Benedict's reagent directly and heat
b. Add iodine solution and observe for a blue-black color
c. Add dilute hydrochloric acid and heat, neutralize with sodium hydrogen carbonate,
then perform the Benedict's test
d. Mix with ethanol and water and observe for a cloudy white emulsion
✔️ Correct Answer: C
Rationale:
The test for non-reducing sugars involves adding dilute hydrochloric acid to the sample
and heating to hydrolyze the non-reducing sugar into reducing sugars (Option C). The
solution is then neutralized with sodium hydrogen carbonate to create a suitable pH for
the Benedict's test. The Benedict's test is then performed as usual. If a non-reducing
sugar such as sucrose was present, the hydrolysis will produce glucose and fructose
(both reducing sugars), resulting in a positive Benedict's test. Sucrose is the only
common non-reducing disaccharide.
Option A is incorrect because non-reducing sugars will not give a positive Benedict's test
without prior hydrolysis. Option B is incorrect because iodine tests for starch, not non-
reducing sugars. Option D is incorrect because the emulsion test detects lipids.
How do you test for starch?
a. Add Benedict's reagent and heat
b. Add iodine solution and observe for a blue-black color
c. Add Biuret reagent and observe for a purple color
d. Mix with ethanol and water and observe for a cloudy white emulsion
✔️ Correct Answer: B
Rationale:
The test for starch involves adding iodine solution to the sample and observing for a
blue-black color (Option B). Iodine solution (iodine in potassium iodide) reacts with the
