Growth and Nutrition of Bacteria – Section 1

11. The total biomass of an organism will be determined by the nutrient present in the lowest concentration relative to the organism’s requirements is a statement of

A. Liebig’s Law of the minimum
B. Shelford’s Law of tolerance
C. quorum sensing
D. Heisenberg’s principle of uncertainty

Correct Answer: A. Liebig’s Law of the minimum

12. The growth is normally expressed as __________ in turbidimetric measurement

A. cells per ml
B. cfu/ml
C. optical density
D. mg N2/ml

Correct Answer: C. optical density

13. Which of the following organisms typically get their carbon for biosynthesis from carbon dioxide?

A. Glucose-fermenting bacteria (fermentation)
B. Anaerobic, glucose-respiring bacteria (anaerobic respiration)
C. Aerobic, glucose-respiring bacteria (aerobic respiration)
D. Ammonia-oxidizing bacteria (chemolithotrophic bacteria)

Correct Answer: D. Ammonia-oxidizing bacteria (chemolithotrophic bacteria)

14. An organism that expends energy to grow in a habitat with a low water activity in order to maintain internal solute concentrations to retain water is

A. osmotolerant
B. acidophile
C. aerotolerant anaerobe
D. alkalophile

Correct Answer: A. osmotolerant

15. The straightforward method of binary fission explains how bacteria

A. grow in nutrient agar
B. evolve
C. move
D. reproduce

Correct Answer: D. reproduce

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