Enzyme Coursework. Investigation to find the effect of substrate concentration on the rate of an enzyme controlled reaction

Investigation to find the effect of substrate concentration on the rate of an enzyme controlled reaction Design Aspect 1: Defining the problem and selecting variables Investigation title: is the rate of an enzyme controlled reaction affected by substrate concentration? Background information Enzymes are often referred to as "biological catalysts", since they increase the rate of reactions in living organisms. Enzymes are also substrate specific, which means that only a specific substrate can fit into its active site (which is where the catalysing effect occurs) and as such, there are different enzymes which deal with different reactions (for example, protease breaks down proteins into amino acids) - this is the basis for the 'lock and key' theory. The stages of an enzyme controlled reaction are: ) Enzyme + substrate The enzyme and substrate are in solution together 2) Enzyme substrate complex A substrate has moved into the active site 3) Enzyme product complex The reaction has taken place, but the products haven't been released from the active site 4) Enzyme + product The enzyme and product are now in solution together (after the product was released from the active site) The rate of an enzyme controlled reaction are mainly affected by: temperature, substrate concentration, enzyme concentration and pH. By increasing the substrate concentration, there is a higher

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  • Level: International Baccalaureate
  • Subject: Biology
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Neurology and Behaviour. Focus question: Is there an increase in the perception and rating of disgust in females rather than males?

QAHS YEAR 11 Gender Differences in the Perception of Disgust Neurobiology and Behaviour Kayla Jackson TABLE OF CONTENTS TABLE OF CONTENTS page number DESIGN 3 1.1 Defining the problem 3 * Focus / research question * Hypothesis * Background information / theory * Investigation Variables 1.2 Controlling Variables 4 * Treatment of Controlled Variables * Control Experiment 1.3 Experimental Method 4 * Materials * Risk Assessment * Method 2 DATA COLLECTION and PROCESSING 5 2.1 Recording Raw Data * Quantitative Data * Qualitative Data 2.2 Processing Raw Data 6 * Statistical Processing - calculations 2.3 Presenting Processed Data 6 * Result (s) table (s) * Graph (s) * Graph (b) 3 CONCLUSION and EVALUATION 8 3.1 Conclusion * Conclusion statement * Conclusion explanation 3.2 Evaluation Procedures 9 * Reliability * Limitations / Weaknesses / errors in Laboratory Investigation * Significance of weaknesses on experimental results 3.3 Improving the Investigation 10 * Modifications to experiment BIBLIOGRAPHY 11 APPENDIX 12 Appendix One: Curtis et al, 2004. Paired disgust sensitivity stimuli and average disgust scores Appendix Two: Disgust Sensitivity by age and gender (Curtis et al. 2004) Appendix Three: QAHS STUDENT ACTVITY RISK ASSESSMENT and PRAC

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  • Level: International Baccalaureate
  • Subject: Biology
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