Which of the following contribute(s) to the spread of Legionella pneumophila in domestic water systems?

a. biofilm formation
b. heat resistance
c. resistance to chlorine
d. all of the above


Answer: D

Biology & Microbiology

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As the difference in reduction potential between a redox pair increases, the amount of free energy made available ________.

A. decreases B. remains the same C. increases D. cannot be determined

Biology & Microbiology

____ reproduction generates more ____ than does ____ reproduction

a. Asexual; genetic diversity; sexual b. Sexual; genetic stability; asexual c. Sexual; genetic diversity; asexual d. Asexual; haploid cells; sexual e. Sexual; identical offspring; asexual

Biology & Microbiology

According to pressure-flow theory, how does sap move from the sieve tube into a sink?

A. a positive pump pressure B. osmosis of the dissolved sugars across the sieve tube and the sink plasma membranes C. a negative pump pressure D. gravitational action as phloem moves down from the source E. active membrane transport through the plasma membranes

Biology & Microbiology

Which is true about the energy of activation?

A. In any one metabolic pathway, all steps will have the same energy of activation. B. Adding the correct enzyme can lower the energy of activation. C. Energy of activation is the difference between the energy of the reactant and the energy of the product. D. Energy of activation is measured as the energy that is released after a reaction occurs. E. The energy of activation is always lower than the energy of the reactant.

Biology & Microbiology