• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Enzyme amylase action on starch

Extracts from this document...

Introduction

Jack Chen 10KM Biology Assessed Practical: Enzyme amylase action on starch Aim: To find if the amount of starch present would affect the rate at which the amylase breaks it down. Hypothesis: The more starch there is, the longer it will take the amylase to break it down; the lesser starch there is, the faster it will take the amylase to break it down. Variables: Independent variable: The amount of starch Dependent variable: The time needed for amylase to breaks starch down. Constants: Same amount of amylase, and same temperature. Equipment: Starch suspension Amylase solution Syringes Iodine solution White tile Pipette Stop Watch Safety glasses Method: Put twenty very small drops of iodine solution, spaced well apart, onto a white tile. ...read more.

Middle

Record the color that the drop goes. Start a stopwatch as soon as possible. Continue to test one drop of the starch/amylase mixture every 20 seconds, and record the color the drop goes each time. Go on doing this until the iodine drop does not change color when adding the starch/amylase mixture to it. Repeat the experiment with different amount of starch for 15cm3 and 20cm3. Table of results: Amount of Amylase (cm3) Amount of Starch Suspension (cm3) Time for starch to break down (seconds) Syringe 1 5 10 120 Syringe 2 5 15 180 Syringe 3 5 20 240 Modification: A mixture of amylase/starch suspension is dropped every 20 seconds instead of 10 seconds because it might not be enough time to let the amylase to break down the starch in only 20 seconds. ...read more.

Conclusion

Conclusion: The results proved that my hypothesis was right. The more starch there is, the longer it will take the amylase to break it down; the lesser starch there is, the faster it will take the amylase to break it down. Evaluation: There are only one thing went wrong during the experiment. I did not job down the color change during every 20 seconds when starch is breaking down. Luckily, this was not a big deal because it did not affect the results. Everything else went quite well, there were just one or two odd results made. What I did with the odd results is I compared the odd results to the normal results and found out what was wrong, and then changed it. I could improve accuracy by doing more trials; unfortunately, I did not have much time to do more trials. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Accounting & Finance section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Accounting & Finance essays

  1. Costs, Profits and Break-even Analysis.

    This will therefore be things like the cost of the raw materials, the packaging, the labour time that went into the production (if that can be clearly identified) and so on. * Indirect costs - these are more commonly known in practice as overheads, and are general costs that are not specifically related to the product.

  2. Management Accounting Report.

    x difference I price 158,000kg x 0.05 =7,900 favourable Usage Standard price x difference in usage �1.25 x 8000kg = 10,000 adverse Labour Rate Actual hours x the difference in rate 156,000 hours x 0.15p = 23,400 adverse Efficiency Standard rate x difference in efficiency �5.10 x 6,000 hours =

  1. PEST Analysis

    that equipment is safe and how to handle them, emergency procedures and correctly trained. The 'Sex Discriminate Act' states that it's illegal to discriminate against anyone due to his or her sex or marital statues. The 'Race Relations Act' states that it's illegal to discriminate against someone on the basis of his or her race, colour, or ethic group.

  2. This report has been produced as evidence for Unit 9 - 'Financial Services' - ...

    Ways of assessing the performance of Shares There four main ways assign the performance of shares these are the following: 1. weather the shares price increases or decreases 2. The yield (dividend yield) e.g. the current yield on an Abbey National share is 6.8%, this shown the percentage return a share holder gets on their shares.

  1. Responsible accounting is the ability to conduct business in a way that is not ...

    + 12000 (3) $ 96,000 You can see how these calculations are used in our accounting process by considering the Work in Process Inventory t-account. WORK IN PROCESS INVENTORY 42,360 (BEGINNING BALANCE) 84,360 (BEGINNING INVENTORY) 211,200 (DIRECT LABOR) 750,000 (STARTED & COMPLETED) 316,800 (FACTORY OVERHEAD)

  2. Identifying and describing the main financial service needs for a student starting at university

    discounted rate mortgage with a preferential rate and with no valuation fee or deposit to pay. If you need contents and possessions cover, our specially negotiated Graduate Insurance has optional extra cover for computers and personal possessions Current account rates and charges Interest we pay if you are in credit Gross rate p.a.% AER (%)

  1. Portfolio analysis

    The total percentage of increase is 64% this was a great improvement as it covered the loss I made with Sony. I was considering selling Sony but I thought I may get lucky eventually. I made a total profit of �16481.

  2. Business Plan for Internet Caf

    1.5 Risks * Will people continue to enjoy using the internet and playing games? * Will the individual be willingly to pay the fixed amount hourly rates? * Will there be a demand of more services and cheaper rates? * Will large internet providing companies give extremely cheap prices so

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work