AS Biology Paper 1 2024

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AQACPlease write clearly in block capitals.Centre numberCandidate numberSurnameForename(s)Candidate signatureI declare this is my own work.ASBIOLOGYPaper 1Monday 1 3 May 2024MorningTime allowed: 1 hour 3 0 minutesMaterialsFor 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 writeoutside 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 ofthis 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 wantto be marked.For Examiner's UseQuestionMark123456789T O T A LInformation•The marks for the questions are shown in brackets.• The maximum mark for this paper is 75.AQACPlease write clearly in block capitals.Centre numberCandidate numberSurnameForename(s)Candidate signatureI declare this is my own work.ASBIOLOGYPaper 1Monday 1 3 May 2024MorningTime allowed: 1 hour 3 0 minutesMaterialsFor 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 writeoutside 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 ofthis 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 wantto be marked.For Examiner's UseQuestionMark123456789T O T A LInformation•The marks for the questions are shown in brackets.• The maximum mark for this paper is 75.

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2D o not write.„. . ., ,.outsASeiheAnswerallquestionsinthe spaces provided.jrax1Figure 1showsadiagram of the human gas exchange system.Figure1Structure B is muscle.The volume of the thorax is increased when structure Bcontracts.Name the structures labelledAandB.[2 marks]AB2D o not write.„. . ., ,.outsASeiheAnswerallquestionsinthe spaces provided.jrax1Figure 1showsadiagram of the human gas exchange system.Figure1Structure B is muscle.The volume of the thorax is increased when structure Bcontracts.Name the structures labelledAandB.[2 marks]AB

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3Dono.*wireob'.'sictelieiox01.|2Figure2is a diagram of an alveolus and a blood vessel associatedwiththe alveolus.The direction of the movement of substances is shown by the arrows labelledC-DEFandG .Figure 2CompleteTable 1by writing the correct letter, C.DE,ForG. inthe box next to eachstatement. You may use each letter once, more than once or not at all.[2 marks]Table 1BoxStatementrepresents the diffusion of oxygenrepresents the transport of a gas mixturerepresents blood moving at the highest pressure3Do nofwrteOLCs.deihefiox01 . 2Figure2is a diagram of an alveolus and a blood vessel associated with the alveolus.The direction of the movement of substances is shown by the arrows labelled C,DEFandG .Figure2Complete Table1by writing the correct letter, C, D. E, F orG. in the box next to eachstatement. You may use each letter once, more than once or not at all.[2 marks]Table1BoxStatementrepresents the diffusion of oxygenrepresents the transport of a gas mixturerepresents blood moving at the highest pressure

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4Do .no: wrteOLtsiJe ilefiox013Describe and explainoneadaptation ofa single alveolusfor gas exchange.[2 marks]4Do .no: wrteOLtsiJe ilefiox013Describe and explainoneadaptation ofa single alveolusfor gas exchange.[2 marks]

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5De .no! wrtecufsdJa S eUOJf02 . 1Table 2contains information on the digestion of tv/o biological molecules.CompleteTable 2[4 marks]Table 2BiologicalmoleculeEnzymeName of bondhydrolysedProduct of digestionStarchMaltoseDipeptideDipeptidaseA student investigated starch digestion by mixing starch with a solution of the enzymeused to digest starch.The student did a biochemical test forproteinwhen starch digestion was completed.02 .[ 2Describe a biochemical test to show the presence of protein.[2 marks]Question 2 continues on the next page5De .no! wrtecufsdJa S eUOJf02 . 1Table 2contains information on the digestion of tv/o biological molecules.CompleteTable 2[4 marks]Table 2BiologicalmoleculeEnzymeName of bondhydrolysedProduct of digestionStarchMaltoseDipeptideDipeptidaseA student investigated starch digestion by mixing starch with a solution of the enzymeused to digest starch.The student did a biochemical test forproteinwhen starch digestion was completed.02 .[ 2Describe a biochemical test to show the presence of protein.[2 marks]Question 2 continues on the next page

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602 . 3The student's test for protein was positive.Explain why.[2 marks]02 . 4An enzyme's turnover number (Kat) is the number of substrate molecules convertedinto product molecules by one enzyme molecule in 1 second. It is determined usingthis equation.Kat = Maximum rate of enzyme-controlled reactionIpmol dm"3s’"Enzyme concentration ; pmol dm’3A scientist investigated the action of a protease enzyme.The scientist prepared areactionmixturewithaprotease concentration of 0.0118 pmol dm*3. The kcatfortheprotease is 110 substrate molecules per second.Use this information and the formula to calculate the maximum rate of theprotease-controlled reaction.Give your answer to 3 significant figures.Show your working.[2 marks]Answerpmol dor3s1602 . 3The student's test for protein was positive.Explain why.[2 marks]02 . 4An enzyme's turnover number (Kat) is the number of substrate molecules convertedinto product molecules by one enzyme molecule in 1 second. It is determined usingthis equation.Kat = Maximum rate of enzyme-controlled reactionIpmol dm"3s’"Enzyme concentration ; pmol dm’3A scientist investigated the action of a protease enzyme.The scientist prepared areactionmixturewithaprotease concentration of 0.0118 pmol dm*3. The kcatfortheprotease is 110 substrate molecules per second.Use this information and the formula to calculate the maximum rate of theprotease-controlled reaction.Give your answer to 3 significant figures.Show your working.[2 marks]Answerpmol dor3s1

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703 . 1Describe how viruses are replicated.[4 marks]Question 3 continues on the next page703 . 1Describe how viruses are replicated.[4 marks]Question 3 continues on the next page

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803 . 2A 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 agarpoured the liquid agar into a Petri dish and let the agar setincubated the virus-bacterial culture at 30 °C for 24 hours.Figure 3 shows the appearance of the Petri dish after 24 hours.Figure 3Cloudy agar withgrowing bacteriaClear zoneExplain why clear zones are present in Figure 3.[1 mark]03 . 3Predict the appearance of the Petri dish if the incubation was extended by a few morehours.[1 mark]803 . 2A 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 agarpoured the liquid agar into a Petri dish and let the agar setincubated the virus-bacterial culture at 30 °C for 24 hours.Figure 3 shows the appearance of the Petri dish after 24 hours.Figure 3Cloudy agar withgrowing bacteriaClear zoneExplain why clear zones are present in Figure 3.[1 mark]03 . 3Predict the appearance of the Petri dish if the incubation was extended by a few morehours.[1 mark]

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903 . 4Animalcells replicate during the cell cycle.Figure 4shows one animal cell at a stage of thecellcycle.Figure 4Identify the stage of the cell cycle shown inFigure 4.Explain the appearance of the cell shown inFigure 4Donotrefer to organelles in your answer.[2 marks]Identityof stageExplanationTurn over for the next question903 . 4Animalcells replicate during the cell cycle.Figure 4shows one animal cell at a stage of thecellcycle.Figure 4Identify the stage of the cell cycle shown inFigure 4.Explain the appearance of the cell shown inFigure 4Donotrefer to organelles in your answer.[2 marks]Identityof stageExplanationTurn over for the next question

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1004 . 1Complete Table 3 to show whether the feature of DNA is associated with the DNAmolecule found in each of these locations.Tickthe appropriate boxes.[3 marks]Table 3Feature of DNALocation of DNA moleculeProkaryotic cellNucleusChloroplastIs circularContains fourdifferent types ofnucleotideIs associated withhistones1004 . 1Complete Table 3 to show whether the feature of DNA is associated with the DNAmolecule found in each of these locations.Tickthe appropriate boxes.[3 marks]Table 3Feature of DNALocation of DNA moleculeProkaryotic cellNucleusChloroplastIs circularContains fourdifferent types ofnucleotideIs associated withhistones

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