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2024 AQA A-LEVEL BIOLOGY: PAPER 1 EXAM WITH CORRECT ANSWERS
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2024 AQA A-LEVEL BIOLOGY: PAPER 1 EXAM WITH CORRECT ANSWERS
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2024 AQA A-LEVEL BIOLOGY:PAPER 1 EXAM WITH CORRECT
ANSWERS
1.1 Describe the induced fit model of enzyme action and how an enzyme
acts as a catalyst. - CORRECT-ANSWERS- The substrate binds to the active
site and forms an ES complex.
- The active site changes shape slightly so it's complimentary to the
substrate.
- This reduces the activation energy.
1.2 Tick one box to show which are the substrate the scientists must add to
the reaction mixture is to produce ATP. - CORRECT-ANSWERS- Adenosine
diphosphate.
1.3 Suggest and explain a procedure the scientist could have used to stop
each reaction. - CORRECT-ANSWERS- The nature of the enzyme by putting it
in ice.
1.4 Explain the change in ATP concentration with increasing inorganic
phosphate concentration - CORRECT-ANSWERS- With increasing phosphate
concentration more ES complex is form.
- And at 40 mol dm3, all active sites are occupied.
6.2 Describe the role of the spindle fibres and the behaviour of the
chromosome during each of these phases. - CORRECT-ANSWERS- C:
Prophase AND
- D: Metaphase AND
- E: Anaphase.
- In prophase the chromosomes condense.
- The centromeres attach to the spindle fibres.
- In metaphase the chromosomes lineup at the equator of the cell.
- In anaphase the centromere divides.
7.1 Use your knowledge of phagocytosis to describe how an ADC enters and
kills the tumour cell. - CORRECT-ANSWERS- The cell engulfs the antibody.
- The lysome fuses with the vesicle containing ADC.
, - The lysosomes breakdown the antibody to release the drug.
7.2 Some of the antigens found on the surface of tin cells are also found on
the surface of healthy human cells. Use this information to explain why
treatments with ADC often causes side-effects. - CORRECT-ANSWERS- ADC
will bind to healthy cells.
- Cause a decrease in them.
7.4 Suggest one reason why there are no data for group G and group H after
day eight. - CORRECT-ANSWERS- Because the mice died.
7.5 Suggest and explain to file investigations that should be done before this
ADC is tested on human breast cancer patients. - CORRECT-ANSWERS- Use
other animals to check for side-effects for example a rat.
- Use healthy humans check for side-effects.
8.1 describe how a triglyceride molecule is formed. - CORRECT-ANSWERS-
Condensation reaction that removes 3 water molecules.
- And joins 3 fatty acids and one glycerol.
- Joined by ester bonds.
8.2 put a tick in one box that contains the correct information about one of
these fatty acids. - CORRECT-ANSWERS- Palmitoleic acid is an unsaturated
fatty acid represented by the diagram K.
8.3 suggest one reason why they use the data logger and explain why this
was important in this investigation. - CORRECT-ANSWERS- Increases
accuracy.
- Reduces chance of human error.
8.4 Use this information on table 6 to show how each population is best
adapted for its natural environment when compared with other population. -
CORRECT-ANSWERSROOT LENGTH
- POP 1 grew longer roots in warm temp.
- POP 2 grew longer roots in cool temp.
STANDARD DEVIATION
- Standard deviation doesn't overlap so the difference in mean isn't likely to
be due to chance.
FATTY ACIDS
- POP 1 is better adapted to warm weather because it has more SATURATED
fatty acids so more every is available = more growth.
- POP 2 is better adapted to cool weather because it has more
UNSATURATED fatty acids so there's more lipase activity = more growth.
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