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Download Actual 2024 AQA AS BIOLOGY 7401/1 Paper 1 Merged Question Paper + Mark Scheme Actual 2024 and more Exams Biology in PDF only on Docsity!
Actual 2024 AQA AS BIOLOGY 7401/1 Paper 1 Merged Question Paper + Mark Scheme 1 AQA Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature | declare this is my own work. AS BIOLOGY Paper 1 Monday 13 May 2024 Morning Time allowed: 1 hour 30 minutes Materials For Examiner's Use For this paper you must have: ¢ aruler with millimetre measurements Question Mark * ascientific calculator. 1 Instructions A e Use black ink or black ball-point pen. 3 Fillin the boxes at the top of this page. 4 e Answer all questions. 5 « You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. 8 ¢ If you need extra space for your answer(s), use the lined pages at the end of TE this book. Write the question number against your answer(s). 8 e Show all your working. 5 ¢ Do all rough work in this book. Cross through any work you do not want to be marked. TOTAL Information e The marks for the questions are shown in brackets. ¢ The maximum mark for this paper is 75. TL Do not write outside the Answer all questions in the spaces provided. box [o[1].[1] 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 02 IB/M/Jun24/7401/1 4 4 Do not write outside the {o[1].[3 | Describe and explain one adaptation of a single alveolus for gas exchange. bok [2 marks] 6 INI IB/M/Jun24/7401/1 [o[2].[1] Table 2 contains information on the digestion of two biological molecules. Complete Table 2. Table 2 [4 marks] Biological Name of bond . . molecule Enzyme 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. [o[2].[2] Describe a biochemical test to show the presence of protein. [2 marks] 05 Question 2 continues on the next page Turn over > IB/M/Jun24/7401/1 5 Do not write outside the box fo] 3|.[4] Describe how viruses are replicated. INI [4 marks] Question 3 continues on the next page Turn over > IB/M/Jun24/7401/1 Do not write outside the box 8 Do not write outside the {o[3].[2] A scientist investigated the effect of a virus species on a bacterial culture. box The scientist: e mixed a diluted sample of the virus with a bacterial culture in liquid agar e poured the liquid agar into a Petri dish and let the agar set e 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 Cloudy agar with growing bacteria Clear zone Explain why clear zones are present in Figure 3. [1 mark] [o[3].[3] Predict the appearance of the Petri dish if the incubation was extended by a few more hours. [1 mark] 08 IB/M/Jun24/7401/1 10 [0[4].[1] Complete Table 3 to show whether the feature of DNA is associated with the DNA molecule found in each of these locations. INIA Tick (v) the appropriate boxes. Table 3 [3 marks] Feature of DNA Location of DNA molecule Prokaryotic cell Nucleus Chloroplast Is circular Contains four different types of nucleotide Is associated with histones IB/M/Jun24/7401/1 10 Do not write outside the box 11 11 Do not write outside the box Question 4 continues on the next page DO NOT WRITE/ON THIS PAGE ANSWER IN THE/SPACES PROVIDED Turn over > INIA IB/M/Jun24/7401/1 13 13 Do not write outside the [o[4].[2] 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 [0[4].[3 | Which method is most likely to be successful in decreasing the frequency of antibiotic-resistant bacteria in populations of people? Tick (W) 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. 7 Turn over > 13 IB/M/Jun24/7401/1 14 14 Do not write outside the [0 [5].[1] Malva sylvestris is a plant species. box 1 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] IB/M/Jun24/7401/1 16 16 Do not write outside the [o[5].[3] A student investigated biodiversity in a community of bee species in a field of box 16 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 . Total number of trapped bees after 6 Bee species months Cuckoo bee 250 Domestic honeybee 800 Clover bee 200 The index of diversity in a community of organisms is determined using the formula _ N(N~1) Yn(n—1) 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. [2 marks] Answer IB/M/Jun24/7401/1 [o[5].[4] 17 17 17 Do not write outside the In a different investigation, the student found that: box e the species richness of plants in a field of wild flowers is greater than the species richness of plants in a field of wheat e 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] 11 Turn over for the next question Turn over > IB/M/Jun24/7401/1 19 19 Do not write Fs " = Par e outside the Scientists measured the concentration of inorganic ions in the cytoplasm of box mammalian cells and in the tissue fluid surrounding those cells. Figure 7 shows their results. Figure 7 £ { Key t t LE] Other positively charged ions t 7 core Sodium ions (Na*) root Pet aac H LA im Negatively charged ions Inorganic ion - - concentration t / arbitrary t units omen Pooc EEE | t | | 1 t [ an! L L Cytoplasm Tissue fluid [0[6].[3] 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 > 9 IB/M/Jun24/7401/1 1 20 20 Do not write outside the [o[6].[4] In these mammalian cells, the: box ¢ 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] 20 IB/M/Jun24/7401/1 
