AQA GCSE. Higher tier Suitable for GCSE Biology and GCSE Combined Science Trilogy Answers online. Biology. James Napier

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1 AQA sa m p e GCSE Bioogy Higher tier Suitabe for GCSE Bioogy and GCSE Combined Science Triogy Answers onine James Napier 494_AQA_GCSE_Bio_WB_P.indd GCSE AQA Bioogy.indd /06/8 :9 PM 0/06/08 0:7

2 Contents Paper Ce bioogy... Organisation... 9 Infection and response... 6 Bioenergetics... Paper Homeostasis and response... 6 Inheritance, variation and evoution... 6 Ecoogy This workbook wi hep prepare you for the AQA GCSE Bioogy and AQA GCSE Combined Science: Triogy exams. Your exams wi incude a range of mutipe-choice, short structured questions and onger questions requiring open (extended) responses. You need to be abe to answer questions requiring bioogica knowedge and understanding, as we as being abe to anayse and evauate data set in famiiar and unfamiiar scenarios. This Workbook wi hep you deveop the skis to answer a these question types. For each topic, there are: stimuus materias, incuding key terms and concepts short and onger exam-stye questions space for you to write your answers Answering the questions wi hep you deveop your skis and meet the assessment objectives AO (knowedge and understanding), AO (appication) and AO (anaysis and evauation). sampe You sti need to read your textbook and refer to your revision guides and esson notes. Marks avaiabe are indicated for a questions so that you can gauge the eve of detai required in your answers. Timings are given for the exam-stye questions to make your practice as reaistic as possibe. Answers are avaiabe at

3 Paper Ce bioogy The ce is the basic unit in iving organisms. Pants, animas and bacteria are formed of different types of ce. There are two broad groups of ces prokaryotic ces (bacteria) and eukaryotic ces (the ces in pants and animas). Ces can differentiate and become speciaised for different functions. Stem ces are undifferentiated ces that can divide to produce ces of the same type and can produce other types of ce through differentiation. Ces divide by the process of mitosis. The processes of diffusion, osmosis and active transport are important in moving substances into and out of ces. Ce structure a Give one way in which eukaryotic ces are different from prokaryotic ces. Tick one box. They have a nuceus. They have a ce wa. They have a ce membrane. b Give the function of ribosomes in ces. The diagram beow represents a pant ce. A B C D E F G H a Name the parts abeed A, C and E. sampe A C E b Give the etters of two structures that are not present in anima ces. Ce bioogy c Give the etters of two structures that are not present in bacteria. Questions marked are for GCSE Bioogy students ony

4 a A ight microscope has an eyepiece ens of power 0. The objective enses have powers of 0 and 40. Determine the maximum magnification of this microscope. Tick one box b Expain how the use of eectron microscopes has increased our understanding of ce structures. c i Compete the tabe about some SI units that can be used in measuring bioogica structures. Unit Symbo Number per metre in standard form 0 Micrometre µm ii A photograph of a stem ce in a textbook is 45 mm across. It has been magnified 600 times. Cacuate the actua ength of the ce in µm. Ce division 4 a The ce cyce and mitosis expain the process of ce division. Tick the two boxes that correcty describe processes in the ce cyce. The ce grows and increases the number of sub-ceuar structures. The number of chromosomes in daughter ces is haf the number of that in the parent ce. Mitosis is the first stage in the ce cyce. The DNA repicates to form two copies of each chromosome. b Give one function of mitosis in organisms. 5 a Give the functions of stem ces in embryos and aso in adut humans. Embryos Adut humans b Give two arguments against using stem ces in medica treatments. marks c i Name the part of a pant that contains stem ces. ii Give two benefits of coning pants. sampe µm 4 Questions marked are for Combined Science Triogy and GCSE Bioogy students

5 Transport in ces 6 a i Define the term diffusion. ii Give three factors that affect the rate of diffusion in iving organisms. a b i Expain why arge, muticeuar organisms have deveoped speciaised exchange surfaces. ii Give an exampe of a speciaised exchange surface in fish. 7 The diagram beow shows Visking tubing containing a sugar soution of concentration 0. mo dm surrounded by a sugar soution of 0.5 mo dm in a beaker. sugar of concentration 0.modm in Visking tubing sugar of concentration 0.5modm in beaker a Name the part of a ce that the tubing actuay represents. b Suggest how the appearance of the Visking tubing wi change after 4 hours. Expain your answer. mark sampe Ce bioogy c A student carried out the same investigation but she found that there was no change in her Visking tubing after 4 hours. Suggest an expanation for this. Expain your answer. Questions marked are for GCSE Bioogy students ony 5

6 8 a The tabe beow shows some properties of diffusion, osmosis and active transport. Compete the tabe by adding ticks to the correct boxes. Transports substances down the concentration gradient Diffusion Osmosis Active transport Requires energy from respiration b Give one exampe of active transport in the foowing. i pants ii humans Exam-stye questions 9 a Mitochondria are microscopic structures found in the cytopasm. i Give the function of mitochondria. Mitochondria produce carbon dioxide as a by-product. This carbon dioxide passes out of ces by diffusion. ii Why does carbon dioxide diffuse out of ces? iii Name two parts of a ce that carbon dioxide diffuses through before eaving the ce. b A ce is 50 µm in ength. Determine the magnification required to produce an image in a textbook of 60 mm. c Nerve ces are speciaised anima ces that transmit eectrica (nerve) impuses through the body. The diagram beow represents a neurone. sampe7 nuceus direction of nerve impuse 6 Questions marked are for Combined Science Triogy and GCSE Bioogy students

7 i Labe the myein sheath on the diagram. ii Apart from the presence of an insuating myein sheath, give two other ways in which this neurone is adapted for its function. Ce bioogy 0 Aseptic techniques are procedures used to transfer microorganisms without causing contamination. a A student was transferring bacteria from a cuture botte to a Petri dish. She used the fame of a Bunsen burner to steriise an inocuating oop. Immediatey after faming the inocuating oop she paced it into the cuture botte to obtain some of the bacteria to be transferred. She then removed the Petri dish id and set it down carefuy on a cean part of the aboratory bench. At this stage, she transferred the bacteria to the Petri dish by genty giding the oop over the agar. After this was done she then paced the Petri dish id back on and paced the oop and the cuture botte in the sink for washing. i This student did not show good aseptic technique when carrying out the transfer. Using the information provided, describe three errors that she made. ii Petri dishes containing microbia cutures are incubated at 5ºC rather than a ower or higher temperature. Expain why. iii Expain why the Petri dishes are incubated upside down. b The diagram beow shows the effect of four different antibiotics, A, B, C and D, on bacteria growth in a Petri dish. B A D C bacteria sampe no bacteria i Describe and expain the resuts shown. 4 marks ii The cear area surrounding C has a diameter of 0 mm. Cacuate this area in mm (in your cacuation count the area occupied by the antibiotic disc as part of the cear area). mm Questions marked are for GCSE Bioogy students ony 7