Problem:
Question 1: Why is it necessary to centrifuge a sample before obtaining a spectrophotometer reading? What would happen if you didn't centrifuge first?
Question 2: Imagine that all microorganisms suddenly disappeared from Earth. Why do you think that animals would eventually disappear from Earth? Why would plants disappear? By contrast, if all higher organisms suddenly disappeared, why would a similar fate not befall microorganisms?
Provide a brief explanation for your answer.