A student conducts an experiment to determine the effect of pH on the activity of the enzyme sucrase on sucrose in buffer solutions. What should the student use as the independent variable in the experimental design?

Scientific thinking: what clues about biology might road kill provide?

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic.b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy.c. all bacterial enzymes are harmful to humans and the environment.d. microbes create pollutants and toxins that harm the environment.

Anne, an intern in a microbiology lab, was observing the characteristics of various specimens of protists. match each specimen to the category of protist to which it belongs.