BIOLOGY & HUMAN BIOLOGY AS LEVEL

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1 BIOLOGY & HUMAN BIOLOGY AS LEVEL

2 NOTES

3 AS and A Level Biology and Human Biology What can you expect? You will be encouraged to. Enjoy it! Consider the role and applications of Biology to society Achieve your full potential Develop responsibility for your own learning and meeting deadlines Complete set homework, with help as required. Biology at Chellaston % of A2 Biology students achieved a grade A*,A or B in % pass rate in AS Biology in 2012 with 38% of students in Year 12 achieving grades A or B. Good value-added students consistently out-perform their predicted grades based on prior attainment scores. Small class sizes Fewer than 20 students 2 teachers per class who will guide and support you towards becoming an independent learner. 5 Hrs classroom teaching per week Ongoing class assessment and self-assessment activities to help you keep track of your own progress Excellent tutor support for UCAS applications Clear guidance about how to achieve your goals!

4 Biology AS Unit Pathway Date Teacher 1 Teacher 2 Autumn Half Term 1 Cell Structure Cell Membranes Cell division & diversity, cellular organisation Transport in Animals Autumn Half Term 2 Practical Skills Assessment Exchange Surfaces & breathing Transport in Animals Transport in Plants Spring Half Term 1 Biological Molecules Enzymes Diet & Food Production Health & Disease Spring Half Term 2 Practical Skills Assessment Nucleic Acids Health & Disease Summer Half Term 1 Biodiversity Maintaining Biodiversity Classification Taxonomy Summer Half Term 2 Revision

5 Human Biology AS Unit Pathway Date Teacher 1 Teacher 2 Autumn Half Term 1 The Blood Molecules The Heart & monitoring heart function The circulatory system Autumn Half Term 2 Preventing Blood Loss Blood for Medical Use The Lungs & investigating lung function Spring Half Term 1 Mitosis as part of the cell cycle Detecting & treating cancer Controlling the spread of infectious disease Acquiring immunity Spring Half Term 2 The biological basis of individuality and the monitoring of fetal development The future of infectious disease control Coronary heart disease Summer Half Term 1 The developing infant Lung Disease Diabetes Summer Half Term 2 Revision!

6 Practical Activity: Investigating the effect of surface area:volume ratio on diffusion rate Objective: To calculate the surface area to volume ratio (SA:V) To show the effect of surface area to volume ratio on the diffusion rate of hydrochloric acid Safety: Hydrochloric acid is an irritant so eye protection must be worn Take care with sharps Equipment o A block of stained agar of depth10mm o Scalpel o Five test tubes or small beakers o Forceps o 2M Hydrochloric acid o 5cm3 syringe o White tile o Ruler o Stopwatch o Labels Procedure 1. Cut the agar into 5 different size cubes (from 2mm to 10mm) using the scalpel, a clear ruler and the white tile 2. Using the scalpel to lift the agar blocks, place each block into a test tube or beaker and label clearly with the size of block. 3. Using the syringe, immerse the blocks in 2M HCl acid by covering each block with 2cm3 of the acid 4. Immediately start the stopwatch and time how long the pink colour takes to disappear and for each block to turn completely colourless 5. Record the results in a suitable table

7 6. Draw a suitable graph to show the effect SA:V ratio has on the rate of diffusion. DIAGRAM RESULTS

8 Questions: 1. What prediction did you make about the rate of diffusion and the effect of surface area to volume ratio? 2. Identify at least three key factors you controlled in this experiment. 3. What additional procedures could you carry out to make these results more reliable and more accurate? 4. Explain the effect of surface area to volume ratio on the rate of diffusion and how this is important in living organisms using your graph and your scientific knowledge. 5. What are the limitations of this experiment when compared with living organisms?

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