AQA A LEVEL BIOLOGY PAPER 1 2026
COMPREHENSIVE ASSESSMENT SCRIPT
SOLVED QUESTIONS ANSWERS UPDATED
REVIEW SET
◉ 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.
◉ what kind of protein is collagen?.
COMPREHENSIVE ASSESSMENT SCRIPT
SOLVED QUESTIONS ANSWERS UPDATED
REVIEW SET
◉ 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.
◉ what kind of protein is collagen?.
