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2024 AQA AS BIOLOGY 7401/1 Paper 1
Verified Question Paper and Marking Scheme Attached June 2024
BIOLOGY
Paper 1
Monday 13 May 2024 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
- a ruler with millimetre measurements
- a scientific calculator.
Instructions
- Use black ink or black ball-point pen.
- Fill in the boxes at the top of this page.
- Answer all questions.
- You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages.
- If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s).
- Show all your working.
- Do all rough work in this book. Cross through any work you do not
want to be marked.
Information
- The marks for the questions are shown in brackets.
- The maximum mark for this paper is 75.
For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL
Do not write
outside the
Answer all questions in the spaces provided.
box
Figure 1 shows a diagram of the human gas exchange system.
Figure 1
Structure B is muscle. The volume of the thorax is increased when structure B
contracts.
Name the structures labelled A and B.
[2 marks]
A
B
Do not write
outside the
[2 marks]
box
Describe and explain one adaptation of a single alveolus for gas exchange.
Do not write
outside the
. 1 Table 2 contains information on the digestion of two biological molecules. Complete
Table 2.
[4 marks]
box
Table 2
Biological
molecule
Enzyme
Name of bond
hydrolysed
Product of digestion
Starch Maltose
Dipeptide Dipeptidase
A student investigated starch digestion by mixing starch with a solution of the enzyme used to digest starch.
The student did a biochemical test for protein when starch digestion was completed.
Describe a biochemical test to show the presence of protein.
[2 marks]
Question 2 continues on the next page
Turn over ►
Do not write
outside the
box
[4 marks]
Question 3 continues on the next page
Turn over ►
Describe how viruses are replicated.
Do not write
outside the
box 0 3
A scientist investigated the effect of a virus species on a bacterial culture.
The scientist:
- mixed a diluted sample of the virus with a bacterial culture in liquid agar
- poured the liquid agar into a Petri dish and let the agar set
- incubated the virus-bacterial culture at 30 °C for 24 hours.
Figure 3 shows the appearance of the Petri dish after 24 hours.
Figure 3
Explain why clear zones are present in Figure 3.
[1 mark]
Predict the appearance of the Petri dish if the incubation was extended by a few more
hours.
[1 mark]
Do not write
outside the
. 1 Complete Table 3 to show whether the feature of DNA is associated with the DNA
molecule found in each of these locations.
box
Tick (✓) the appropriate boxes.
[3 marks]
Table 3
Feature of DNA
Location of DNA molecule
Prokaryotic cell Nucleus Chloroplast
Is circular
Contains four
different types of
nucleotide
Is associated with
histones
Do not write
outside the
Question 4 continues on the next page
DO NOT WRITE ON THIS PAGE
ANSWER IN THE SPACES PROVIDED
box
Turn over ►
Do not write
outside the
box 0 4
Using Figure 5 , a student calculated that out of all the people who died when
antibiotic-resistant E. coli were present, 25% of those deaths involved causal E. coli.
The student’s calculation is incorrect.
Use Figure 5 to calculate the correct percentage of deaths involving causal E. coli in
people who died when infected with antibiotic-resistant E. coli.
Identify the mathematical step the student performed incorrectly in their calculation.
[3 marks]
Correct answer %
Incorrect mathematical step
3 Which method is most likely to be successful in decreasing
the frequency of
antibiotic-resistant bacteria in populations of people?
Tick (✓) one box.
[1 mark]
Give people lower doses of antibiotics to treat disease.
Test more people to determine if they are infected with
antibiotic-resistant bacteria.
Vaccinate more people to reach herd immunity against bacteria
that cause diseases common in human populations.
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Do not write
outside the
box 0 5
Malva sylvestris is a plant species.
A student wanted to determine the mean height of M. sylvestris plants growing in a
field.
Describe how the student should obtain measurements of the plants and then process
these measurements to obtain a reliable mean height of plants growing in that field.
[5 marks]
Do not write
outside the
. 3 A student investigated biodiversity in a community of bee species in a field of
wild flowers.
The student trapped and identified the bee species in the field over 6 months.
Table 4 shows some of the student’s results.
Table 4
Bee species
Total number of trapped bees after 6
months
Cuckoo bee 250
Domestic honeybee 800
Clover bee 200
The index of diversity in a community of organisms is determined using the formula
where N = total number of organisms of all species
and n = total number of organisms of each species.
Use the formula and information in Table 4 to calculate the index of diversity in this
community of bee species.
box
[2 marks]
Answer
Do not write
outside the
0 5 box
In a different investigation, the student found that:
the species richness of plants in a field of wild flowers is greater than the species
richness of plants in a field of wheat
the species richness of bees in a field of wild flowers is greater than the species
richness of bees in a field of wheat.
Suggest one reason why the species richness of bees in a field of wild flowers is
greater than the species richness of bees in a field of wheat.
Explain your answer.
[2 marks]
Turn over for the next question
Turn over ►
Do not write
outside the
Scientists measured the concentration of inorganic ions in the cytoplasm of
mammalian cells and in the tissue fluid surrounding those cells.
Figure 7 shows their results.
Figure 7
box
. Use Figure 7 to describe two patterns shown in the total concentrations of positively
and negatively charged ions in the cytoplasm and in tissue fluid.
[2 marks]
Turn over ►
Do not write
outside the
box 0 6
In these mammalian cells, the:
- cell-surface membrane is permeable to sodium ions
- sodium ion concentration does not increase in the cytoplasm over time.
Use this information and Figure 7 to suggest and explain the ion transport
mechanisms involved in the transport of sodium ions.
[2 marks]
