AQA A-LEVEL BIOLOGY PAPER 1
REVISION QUESTIONS AND ANSWERS
2023
Benedict's test (Correct Answers) Which food test is heated in a water bath?
Sucrose (Correct Answers) Which disaccharide is not a reducing sugar?
Test for non-reducing sugars (Correct Answers) Add acid. Neutralise. Add Benedicts.
Heat.
Hydrolysis (Correct Answers) Reaction performed by dilute HCl in the non reducing
sugar test.
Glucose + fructose (Correct Answers) During the non-reducing sugar test what is
sucrose hydrolysed into?
Alpha (Correct Answers) Which type of glucose makes up starch?
amylose and amylopectin (Correct Answers) Names of two types of starch
Amylose (Correct Answers) Coiled, compact form of starch. Stored easily.
Amylopectin (Correct Answers) Branched form of starch. More easily hydrolysed.
surface area (Correct Answers) Branched carbohydrates have a higher _____ for
enzymes to work on.
Glycogen (Correct Answers) Carbohydrate store in animals
branched (Correct Answers) Glycogen is....
metabolic rate (Correct Answers) Glycogen is more branched than amylopectin
because animals have a higher _____________
osmotically inactive. (Correct Answers) Starch is insoluble and therefore ....
Beta (Correct Answers) What type of glucose is cellulose made from?
, Alpha and beta glucose (Correct Answers) H and OH swapped on Carbon 1.
Fibrils (Correct Answers) Cellulose forms long chains called...
H bonds (Correct Answers) Cellulose molecules are crosslinked by
strength (Correct Answers) Cross linking of cellulose molecules gives them...
Triglycerides (Correct Answers) _______ are a good source of energy because they
have a high ratio of energy-storing carbon-hydrogen bonds
what are the roles of lipids? (Correct Answers) 1. source of energy
2. waterproofing
3. insulation
4. protection
how does the structure of phospholipids relate to their properties? (Correct Answers) 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 (Correct Answers)
draw how a dipeptide forms (Correct Answers)
what is meant by 'primary sequence' of a protein (Correct Answers) The unique
sequence of amino acids that make up a protein or polypeptide chain
what is meant by 'secondary sequence' of a protein (Correct Answers) 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 (Correct Answers) 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 (Correct Answers) 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... (Correct Answers) equal volumes and copper sulphate and
sodium hydroxide
REVISION QUESTIONS AND ANSWERS
2023
Benedict's test (Correct Answers) Which food test is heated in a water bath?
Sucrose (Correct Answers) Which disaccharide is not a reducing sugar?
Test for non-reducing sugars (Correct Answers) Add acid. Neutralise. Add Benedicts.
Heat.
Hydrolysis (Correct Answers) Reaction performed by dilute HCl in the non reducing
sugar test.
Glucose + fructose (Correct Answers) During the non-reducing sugar test what is
sucrose hydrolysed into?
Alpha (Correct Answers) Which type of glucose makes up starch?
amylose and amylopectin (Correct Answers) Names of two types of starch
Amylose (Correct Answers) Coiled, compact form of starch. Stored easily.
Amylopectin (Correct Answers) Branched form of starch. More easily hydrolysed.
surface area (Correct Answers) Branched carbohydrates have a higher _____ for
enzymes to work on.
Glycogen (Correct Answers) Carbohydrate store in animals
branched (Correct Answers) Glycogen is....
metabolic rate (Correct Answers) Glycogen is more branched than amylopectin
because animals have a higher _____________
osmotically inactive. (Correct Answers) Starch is insoluble and therefore ....
Beta (Correct Answers) What type of glucose is cellulose made from?
, Alpha and beta glucose (Correct Answers) H and OH swapped on Carbon 1.
Fibrils (Correct Answers) Cellulose forms long chains called...
H bonds (Correct Answers) Cellulose molecules are crosslinked by
strength (Correct Answers) Cross linking of cellulose molecules gives them...
Triglycerides (Correct Answers) _______ are a good source of energy because they
have a high ratio of energy-storing carbon-hydrogen bonds
what are the roles of lipids? (Correct Answers) 1. source of energy
2. waterproofing
3. insulation
4. protection
how does the structure of phospholipids relate to their properties? (Correct Answers) 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 (Correct Answers)
draw how a dipeptide forms (Correct Answers)
what is meant by 'primary sequence' of a protein (Correct Answers) The unique
sequence of amino acids that make up a protein or polypeptide chain
what is meant by 'secondary sequence' of a protein (Correct Answers) 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 (Correct Answers) 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 (Correct Answers) 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... (Correct Answers) equal volumes and copper sulphate and
sodium hydroxide
