30 minutes. I use salt and petri dish for students to practice streaking bacterial cells. The salt bounce on petri dish, so it did not work well. I then tried glucose (chemical grade), and it bounce just like salt.
I then spend the rest class working on previous exams. I went through only 4 questions in the spring 2014 exam 1.
One student made a good point that substrate is what an enzyme consumes. So, I should state "product" of an enzyme in the problem stet.
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