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There is the classic potato starch/iodine/amylase experiment:
http://dailynexus.com/2016-08-31/chemistry-101-the-classic-potato-iodine-blueblack-experiment-finally-has-an-explanation/
From memory, when you add iodine to a small piece of potato, the potato starch reacts to produce a dark blue/black colour. The amylase enzyme in human saliva can break down ...
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You would not expect the same enzyme from different tissues to have different Km values if the enzymes are truly identical.
In addition, you would not expect the Km value to change during purification: the Michaelis constant for the purified enzyme should be the same as that determined with a crude sample. If this is not true, it might mean that the ...
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This is a question I also remember wondering about when I was younger in school. Now as a professional it's way too obvious to even explain. But i think it's an important and common question, which warrants an example or two from common daily lab practice.
Preface
You have to understand that DNA is a molecule. It's really tiny. It's not trivial to work ...
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Sort of.
Proteins can enter the body through the intestines by exploiting a few transport mechanisms, They are not truly crossing the cell membrane but are transported across the cell in vesicles. Though not into the bloodstream but into the lymph system.
M cells in particular will move antigens across the intestinal wall, a few more durable proteins (like ...
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Someone has already mentioned catalase and potatoes, but another way to do it would be to use hydrogen peroxide. The students could cut the potato up smaller to investigate the impact of surface area, heat/cool the mixture using a beaker with water in and a thermometer, and change the amount of potato used. So a few variations of conditions for a fairly low ...
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Does the ingestion of alcohol, when taking (racemic) methylphenidate can actually make it more potent?
It is the 2011 study you've mentioned that answers most of the question.
In the study, ethanol co-ingestion with racemic MPH elevated maximal plasma levels of d-MPH by up to 40%. The participants reported greater stimulant effect after alcohol + MPH than ...
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You could try methyl cellulose, which my lab and others use. It's not exactly an adhesive, but it is quite viscous. It's common enough that it's in the Zebrafish Book: https://wiki.zfin.org/display/prot/Methyl+Cellulose+Mounting . Obviously, be sure whatever you do is approved by your animal care and use committee.
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In order to set up an enzyme assay that allows quantitative kinetic analysis three key requirements come to mind:
The assay should be sensitive
A plot of velocity versus enzyme concentration should be linear and through the origin at both high and low substrate concentrations.
The initial rate should be measured.
Spectrophotometric Assays
...
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