AQA A-LEVEL BIOLOGY PAPER 1 NEWEST
EXAM 2025 WITH MULTIPLE CHOICE OF
QUESTIONS AND DETAILED SOLVED
SOLUTIONS ALREADY GRADED A+ AND 100%
GUARANTEE PASS (JUST RELEASED!!!!!)
what purpose does the structure of amylopectin serve? - CORRECT
ANSWER-more surface area for enzymes to work on, thus glucose
molecules can be released at a much quicker rate.
how is the structure of starch suited to its function? - CORRECT
ANSWER-1. starch is insolube so it doesnt affect water potential
2. it is large enough that it doesnt diffuse out of cells
3. compact enough so that a lot of it can be stored in a small
space
4. branched= each end can simultaneously be acted on by
enzymes, so glucose is quickly released
how is the structure of glycogen suited to its function? - CORRECT
ANSWER-1. insoluble, so no effect on water potential of cell
2. insoluble, so doesnt diffuse out of cells
3. compact, a lot of it can be stored in a small space
4. very highly branched= each end can simultaneously be acted
on by enzymes, so glucose is quickly released
,why do animals need highly branched glycogen? - CORRECT
ANSWER-because animals metabolic rate is faster than plants and
so needs glucose to be released quicker.
describe the structure of cellulose - CORRECT ANSWER-made up of
straight chains of beta glucose
the chains are parallel to each other, so H bonds form cross-
linkages
all the H bonds together strengthens the cellulose
forms microfibrils
draw alpha and beta glucose - CORRECT ANSWER-
how does the structure of triglycerides relate to their
properties? - CORRECT ANSWER-1. triglycerides have a high ratio of
energy-storing carbon-hydrogen bonds to carbon atoms, so its a
good source of energy.
2. low mass to energy ratio, so theyre good energy storage
molecules.
3. large and non-polar, therefore insoluble, therefore don't
affect osmosis.
4. high ratio of hydrogen to oxygen atoms, so can release water
when oxidised, hence provide a source of water
what are the roles of lipids? - CORRECT ANSWER-1. source of energy
2. waterproofing
3. insulation
, 4. protection
how does the structure of phospholipids relate to their
properties? - CORRECT 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 - CORRECT ANSWER-
draw how a dipeptide forms - CORRECT ANSWER-
what is meant by 'primary sequence' of a protein - CORRECT
ANSWER-The unique sequence of amino acids that make up a
protein or polypeptide chain
what is meant by 'secondary sequence' of a protein - CORRECT
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 - CORRECT
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 - CORRECT
ANSWER-If a protein is made up of several polypeptide chains that
EXAM 2025 WITH MULTIPLE CHOICE OF
QUESTIONS AND DETAILED SOLVED
SOLUTIONS ALREADY GRADED A+ AND 100%
GUARANTEE PASS (JUST RELEASED!!!!!)
what purpose does the structure of amylopectin serve? - CORRECT
ANSWER-more surface area for enzymes to work on, thus glucose
molecules can be released at a much quicker rate.
how is the structure of starch suited to its function? - CORRECT
ANSWER-1. starch is insolube so it doesnt affect water potential
2. it is large enough that it doesnt diffuse out of cells
3. compact enough so that a lot of it can be stored in a small
space
4. branched= each end can simultaneously be acted on by
enzymes, so glucose is quickly released
how is the structure of glycogen suited to its function? - CORRECT
ANSWER-1. insoluble, so no effect on water potential of cell
2. insoluble, so doesnt diffuse out of cells
3. compact, a lot of it can be stored in a small space
4. very highly branched= each end can simultaneously be acted
on by enzymes, so glucose is quickly released
,why do animals need highly branched glycogen? - CORRECT
ANSWER-because animals metabolic rate is faster than plants and
so needs glucose to be released quicker.
describe the structure of cellulose - CORRECT ANSWER-made up of
straight chains of beta glucose
the chains are parallel to each other, so H bonds form cross-
linkages
all the H bonds together strengthens the cellulose
forms microfibrils
draw alpha and beta glucose - CORRECT ANSWER-
how does the structure of triglycerides relate to their
properties? - CORRECT ANSWER-1. triglycerides have a high ratio of
energy-storing carbon-hydrogen bonds to carbon atoms, so its a
good source of energy.
2. low mass to energy ratio, so theyre good energy storage
molecules.
3. large and non-polar, therefore insoluble, therefore don't
affect osmosis.
4. high ratio of hydrogen to oxygen atoms, so can release water
when oxidised, hence provide a source of water
what are the roles of lipids? - CORRECT ANSWER-1. source of energy
2. waterproofing
3. insulation
, 4. protection
how does the structure of phospholipids relate to their
properties? - CORRECT 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 - CORRECT ANSWER-
draw how a dipeptide forms - CORRECT ANSWER-
what is meant by 'primary sequence' of a protein - CORRECT
ANSWER-The unique sequence of amino acids that make up a
protein or polypeptide chain
what is meant by 'secondary sequence' of a protein - CORRECT
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 - CORRECT
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 - CORRECT
ANSWER-If a protein is made up of several polypeptide chains that
