Thursday, 3 January 2013

2.11 describe experiments to investigate how enzyme activity can be affected by changes in temperature.


  • Put starch into a test tube; either heat or cool it.
  • Add amylase
  • With this mixture on white tiles, add iodine
  • Time how long it takes for the iodine to stop being blue black
  • Repeat at different temperatures and compare
When the iodine stops being blue/black there is no starch present, so it must have been digested by the enzymes.
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30 comments:

  1. Unknown27 June 2013 at 04:07

    Hannah helped.

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  2. Unknown18 April 2014 at 04:04

    will the product be a simple sugar?

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    Replies
    1. Geniuslightbulb18 May 2014 at 05:13

      Yes, because amylase breaks down starch into the sugar maltose, which is a simple sugar.

      Delete
    2. HannahHelp28 November 2014 at 05:41

      Yes that's right, thanks for helping :)

      Delete
  3. HannahHelp28 November 2014 at 05:39

    No probs

    ReplyDelete
  4. Anonymous16 December 2015 at 09:09

    What colour will the iodine turn when it stops being blue/black??

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  5. Unknown16 January 2016 at 04:21

    Doesnt it have to change to Blue Black, because it is Iodine??? Red to Blue Black, it said in like 2.7 of your blog???

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  6. Unknown16 January 2016 at 04:22

    Doesnt it have to change to Blue Black, because it is Iodine??? Red to Blue Black, it said in like 2.7 of your blog???

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  7. Unknown18 January 2016 at 08:48

    It will start off as blue/black as there is starch in the solution however you will know when there is no more starch as the iodine in the solution will turn a red/brown colour

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  8. Unknown30 March 2016 at 11:35

    hannah helped once again

    ReplyDelete
  9. Unknown31 March 2016 at 09:06

    jknjvghvvhgb

    ReplyDelete
  10. Unknown8 May 2016 at 04:02

    Must you add the amylase after the glucose is heated?

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  11. Unknown15 May 2016 at 15:14

    thx soo much

    ReplyDelete
  12. Unknown18 May 2016 at 12:33

    HANNAH!!! YOU ARE AMAZING!!!THIS BLOG IS THE REASON IM NOT SO STRESSED OUT! PLEASE KEEP GOING, KNOWING THAT YOU HAVE HELPED ME SO MUCH.....THANK YOU THANK YOU THANK YOU!!!!

    ReplyDelete
  13. Unknown10 June 2016 at 01:11

    bruh

    ReplyDelete
  14. Anonymous19 July 2016 at 03:16

    life saver

    ReplyDelete
  15. Anonymous26 June 2017 at 02:37

    The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  16. Anonymous26 June 2017 at 07:35

    more at

    http://igcse-biology-notes.blogspot.hk/2017/06/211-describe-experiments-to-investigate.html

    ReplyDelete
  17. Unknown24 November 2017 at 01:32

    Is it fine if I wrote
    Enzyme catalase ,which breaks hydrogen peroxide into water and hydrogen
    Catalase in found in potatoes , therefore putting potato chips into preoxide will produce O2 .the rate of reaction is therefore proportional to the volume of 02 given off. The changing in temperature will alter the volume

    ReplyDelete
  18. Anonymous3 March 2018 at 01:34

    How enzyme activity can be affected by changes in temperature

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  19. Anonymous3 March 2018 at 01:37

    Can someone help me please

    ReplyDelete
  20. Isabelle15 March 2018 at 06:43

    https://mysciencesnapshot.blogspot.my/

    ReplyDelete
  21. Unknown19 November 2018 at 22:19

    help me

    ReplyDelete
  22. Unknown8 March 2019 at 05:45

    pls explain it briefly

    ReplyDelete
  23. Zay15 March 2020 at 06:50

    How would you test for the product formed?

    ReplyDelete