AQA AS BIOLOGY PAPER 2 MARK SCHEME
SCRIPT 2026 TESTED QUESTIONS WITH
COMPLETE SOLUTIONS GRADED A+
⩥ Sucrose. Answer: Which disaccharide is not a reducing sugar?
⩥ Test for non-reducing sugars. Answer: Add acid. Neutralise. Add
Benedicts. Heat.
⩥ Hydrolysis. Answer: Reaction performed by dilute HCl in the non
reducing sugar test.
⩥ Glucose + fructose. Answer: During the non-reducing sugar test what
is sucrose hydrolysed into?
⩥ Alpha. Answer: Which type of glucose makes up starch?
⩥ amylose and amylopectin. Answer: Names of two types of starch
⩥ Amylose. Answer: Coiled, compact form of starch. Stored easily.
,⩥ Amylopectin. Answer: Branched form of starch. More easily
hydrolysed.
⩥ surface area. Answer: Branched carbohydrates have a higher _____
for enzymes to work on.
⩥ Glycogen. Answer: Carbohydrate store in animals
⩥ branched. Answer: Glycogen is....
⩥ metabolic rate. Answer: Glycogen is more branched than amylopectin
because animals have a higher _____________
⩥ osmotically inactive.. Answer: Starch is insoluble and therefore ....
⩥ Beta. Answer: What type of glucose is cellulose made from?
⩥ Alpha and beta glucose. Answer: H and OH swapped on Carbon 1.
⩥ Fibrils. Answer: Cellulose forms long chains called...
⩥ H bonds. Answer: Cellulose molecules are crosslinked by
,⩥ strength. Answer: Cross linking of cellulose molecules gives them...
⩥ Triglycerides. Answer: _______ are a good source of energy because
they have a high ratio of energy-storing carbon-hydrogen bonds
⩥ what are the roles of lipids?. Answer: 1. source of energy
2. waterproofing
3. insulation
4. protection
⩥ how does the structure of phospholipids relate to their properties?.
Answer: 1. polar, therefore will position itself to form a bilayer
2. the structure allows them to form glycolipids by combining with
carbohydrates within the cell-surface membrane. these are important in
cell recognition.
⩥ draw the structure of an amino acid. Answer:
⩥ draw how a dipeptide forms. Answer:
⩥ what is meant by 'primary sequence' of a protein. Answer: The unique
sequence of amino acids that make up a protein or polypeptide chain
, ⩥ what is meant by 'secondary sequence' of a protein. Answer: The way
in which the primary structure of a polypeptide chain folds e.g. alpha
helix or beta pleated sheets. shape is held by H bonds.
⩥ what is meant by 'tertiary sequence' of a protein. Answer: This is the
overall 3-D structure of the protein.
The shape of the protein is held together by H bonds and ionic bonds
and disulfide bridges.
⩥ what is meant by 'quaternary sequence' of a protein. Answer: If a
protein is made up of several polypeptide chains that are linked in
various ways, the way they are arranged is called the quaternary
structure.
⩥ Biuret is made up of.... Answer: equal volumes and copper sulphate
and sodium hydroxide
⩥ what are fiberous proteins made up of?. Answer: made of long
molecules arranged to form fibres (e.g. in keratin). Several helices may
be wound around each other to form very strong fibres.
⩥ what are globular proteins made up of?. Answer: made of chains
folded into a compact structure. One of the most important classes are
the enzymes. Although these folds are less regular than in a helix, they
are highly specific and a particular protein will always be folded in the
same way.
SCRIPT 2026 TESTED QUESTIONS WITH
COMPLETE SOLUTIONS GRADED A+
⩥ Sucrose. Answer: Which disaccharide is not a reducing sugar?
⩥ Test for non-reducing sugars. Answer: Add acid. Neutralise. Add
Benedicts. Heat.
⩥ Hydrolysis. Answer: Reaction performed by dilute HCl in the non
reducing sugar test.
⩥ Glucose + fructose. Answer: During the non-reducing sugar test what
is sucrose hydrolysed into?
⩥ Alpha. Answer: Which type of glucose makes up starch?
⩥ amylose and amylopectin. Answer: Names of two types of starch
⩥ Amylose. Answer: Coiled, compact form of starch. Stored easily.
,⩥ Amylopectin. Answer: Branched form of starch. More easily
hydrolysed.
⩥ surface area. Answer: Branched carbohydrates have a higher _____
for enzymes to work on.
⩥ Glycogen. Answer: Carbohydrate store in animals
⩥ branched. Answer: Glycogen is....
⩥ metabolic rate. Answer: Glycogen is more branched than amylopectin
because animals have a higher _____________
⩥ osmotically inactive.. Answer: Starch is insoluble and therefore ....
⩥ Beta. Answer: What type of glucose is cellulose made from?
⩥ Alpha and beta glucose. Answer: H and OH swapped on Carbon 1.
⩥ Fibrils. Answer: Cellulose forms long chains called...
⩥ H bonds. Answer: Cellulose molecules are crosslinked by
,⩥ strength. Answer: Cross linking of cellulose molecules gives them...
⩥ Triglycerides. Answer: _______ are a good source of energy because
they have a high ratio of energy-storing carbon-hydrogen bonds
⩥ what are the roles of lipids?. Answer: 1. source of energy
2. waterproofing
3. insulation
4. protection
⩥ how does the structure of phospholipids relate to their properties?.
Answer: 1. polar, therefore will position itself to form a bilayer
2. the structure allows them to form glycolipids by combining with
carbohydrates within the cell-surface membrane. these are important in
cell recognition.
⩥ draw the structure of an amino acid. Answer:
⩥ draw how a dipeptide forms. Answer:
⩥ what is meant by 'primary sequence' of a protein. Answer: The unique
sequence of amino acids that make up a protein or polypeptide chain
, ⩥ what is meant by 'secondary sequence' of a protein. Answer: The way
in which the primary structure of a polypeptide chain folds e.g. alpha
helix or beta pleated sheets. shape is held by H bonds.
⩥ what is meant by 'tertiary sequence' of a protein. Answer: This is the
overall 3-D structure of the protein.
The shape of the protein is held together by H bonds and ionic bonds
and disulfide bridges.
⩥ what is meant by 'quaternary sequence' of a protein. Answer: If a
protein is made up of several polypeptide chains that are linked in
various ways, the way they are arranged is called the quaternary
structure.
⩥ Biuret is made up of.... Answer: equal volumes and copper sulphate
and sodium hydroxide
⩥ what are fiberous proteins made up of?. Answer: made of long
molecules arranged to form fibres (e.g. in keratin). Several helices may
be wound around each other to form very strong fibres.
⩥ what are globular proteins made up of?. Answer: made of chains
folded into a compact structure. One of the most important classes are
the enzymes. Although these folds are less regular than in a helix, they
are highly specific and a particular protein will always be folded in the
same way.
