Low Cost Bology Experiments
tomlinson at pplros.demon.co.uk
Fri Oct 4 11:13:50 EST 1996
In article <40.10123.3126 at channel1.com> Harold Drabkin,
harold.drabkin at channel1.com writes:
>For the higher grades, one might consider using the action of salivary
>amylase to demonstrate enzymes. Simple starch solution for substrate;
>iodine solution for a color development to show up the starch; saliva
>for the enzyme source. One could do simple things like heat
>denaturation, etc. (I used to do this with a group of high school
>sophomores; I had access to a spec. 20, so we could even get some
>numbers, but this isn't absolutely necessary).
Here's a similar one, to demonstrate reduction of hydrogen peroxide by
catalase. Grind up fresh liver, drop it in H2O2 (chemists sell it) and
presto! O2 is given off, which will relight the proverbial glowing spill.
You can do the same enzyme denaturation stuff on it, and if you have a
maybe even measure activity/gfw.
You can demonstrate transpiration with shoots (celery, for example) in
sugar, etc, block it with vaseline, increase rate with airflow, and
in light and dark etc (I'm less clear on this one, but it worked in 2ndary
school!). Just cut the stems underwater to avoid air bubbles in the
Osmosis can be shown with potato slices in water and saturated sugar
That's all I can come up with for now, but watch this space!
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