Welcome to the Headmaster's Blog where you'll find updates, thoughts, and events regarding Saint David's School, the education of boys, and other items of interest. This is by no means meant to be a complete account of all that happens at Saint David's. Please refer to the school's website for more complete details -- it's more a Headmaster's musings.
Tuesday, September 15, 2015
DNALC: Looking at Liver
To test if the enzyme really does produce oxygen molecules, boys took a sample of calf's liver (which contains catalase) placed it into a cup of hydrogen peroxide, and observed the change in temperature and bubbling that occurred, noting that these indicated the possible release of oxygen. To further test, they took a small lit match and placed it in the bubbles, observing that the larger flames that resulted also indicated the presence of oxygen (see video clip).
They then experimented and observed the deformation that occurred when the enzyme was heated or treated with acid (vinegar).
In this lesson the boys saw the importance of having a control in their experiment, of being precise, and thinking critically and deeply to hypothesize results.