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2024 AQA AS BIOLOGY 7401/1 Paper 1 Verified Question Paper and Marking Scheme Attached J, Exams of Biology

2024 AQA AS BIOLOGY 7401/1 Paper 1 Verified Question Paper and Marking Scheme Attached June 2024 BIOLOGY Paper 1 Monday 13 May 2024 Materials For this paper you must have: Morning • 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. Time allowed: 1 hour 30 minutes • 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 bracket

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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
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f
pf20
pf21
pf22
pf23
pf24
pf25
pf26
pf27
pf28
pf29
pf2a
pf2b
pf2c
pf2d
pf2e
pf2f
pf30
pf31
pf32
pf33
pf34
pf35

Partial preview of the text

Download 2024 AQA AS BIOLOGY 7401/1 Paper 1 Verified Question Paper and Marking Scheme Attached J and more Exams Biology in PDF only on Docsity!

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.

Turn over ►

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]