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AQA A LEVEL BIOLOGY PAPER 1 LATEST UPDATED 2025 ACTUAL FINAL EXAM WITH COMPLETE DETAILED QUESTIONS AND CORRECT VERIFIED ANSWERS ALREADY A+ GRADED£20.26
aqa a level biology paper 1 latest updated 2025 ac
aqa a level biology paper 1 latest updated 2025
aqa a level biology paper 1
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AQA A LEVEL BIOLOGY PAPER 1
AQA A LEVEL BIOLOGY PAPER 1
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AQA A LEVEL BIOLOGY PAPER 1 LATEST UPDATED 2025
ACTUAL FINAL EXAM WITH COMPLETE DETAILED QUESTIONS
AND CORRECT VERIFIED ANSWERS ALREADY A+ GRADED
large molecules often contain carbon. why? - ANSWER-they can readily
form bonds with other carbon atoms. this forms a 'backbone'. other
atoms can then attach.
describe benedicts test for reducing sugars - ANSWER-add equal
volumes of the sugar sample and benedicts reagent.
heat the mixture in a water bath for 5 minutes.
brick red precipitate will form.
what is a reducing sugar? - ANSWER-a sugar that can reduce (give
electrons to) another chemical.
describe the benedicts test for non reducing sugars - ANSWER-with
food sample, add an equal volume of dilute hydrochloric acid in a test
tube.
place test tube in water bath for 5 mins.
add sodium hydrogencarbonate solution.
heat resulting solution with an equal volume of benedicts. solution for
5 minutes.
,turns orange/brown.
what does dilute hydrochloric acid do in the benedicts test for non
reducing sugars? - ANSWER-it hydrolyses any disaccharide into
monosaccharides, thus also forming reducing sugars.
describe the structure of starch - ANSWER-chains of alpha glucose
some chains are branched= amylopetcin
some chains are coiled= amylose
what purpose does the structure of amylose serve? - ANSWER-makes
the molecule compact so it is stored more easily.
what purpose does the structure of amylopectin serve? - 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? - ANSWER-1. starch
is in soluble so it doesn’t affect water potential
2. it is large enough that it doesn’t 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? - ANSWER-1.
insoluble, so no effect on water potential of cell
2. insoluble, so doesn’t 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? - ANSWER-because
animals metabolic rate is faster than plants and so needs glucose to be
released quicker.
describe the structure of cellulose - 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 - ANSWER-
how does the structure of triglycerides relate to their properties? -
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? - 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
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