Microbiology A Systems Approach 5Th Edition By Marjorie Kelly Cowan – Test Bank

Microbiology A Systems Approach 5Th Edition By Marjorie Kelly Cowan – Test Bank

CH-07: Test Bank

Multiple Choice Questions

1. Many lakes in the United States are suffering from periodic algae blooms, which can be thought of as an infection of the lake. Although the algae are naturally-occurring in the lake, when adjacent farm fields are over-fertilized with diammonium phosphate, the run-off deposits these nutrients in the lake, allowing the algae to grow without limit. Which of the following statements is incorrect regarding the overgrowth of algae?

A. Lakes have sufficient micronutrients for algae to grow.

B. The algae are heterotrophs.

C. The nitrogen in the fertilizer is in the ammonium form, the preferred nitrogen source of most microbes.

D. The phosphorus in the fertilizer is in the phosphate form, the preferred phosphorus source of most microbes.

E. The carbon source for these algae is not limiting in lakes.

2. Following the Deepwater Horizon accident in the Gulf of Mexico in 2010, bioremediation was used to eliminate much of the oil from the contaminated water. To encourage the growth of oil-degrading microbes, “fertilizer” including iron and nitrogen was added to the water. Which of the following statements regarding the growth of these microbes is incorrect?

A. The concentration of sulfate in the Gulf of Mexico is sufficient for the growth of oil-degrading microbes.

B. Large amounts of iron were needed, as iron is a macronutrient for oil-degrading microbes.
C. Nitrogen gas (N2) present in air is not in a form that can be used by oil-degrading microbes.

D. The oil-degrading microbes used oil (hydrocarbons) as their carbon source.

3. Most of the dry weight of a microbial cell is from ______.

A. water

B. minerals

C. inorganic compounds

D. organic compounds

E. salts

4. Which compound has the highest concentration in a cell?

A. NH3

B. CO2
C. H2O
D. CH4
E. Glucose

5. Which of the following is not a major element of a microbial cell?

A. Oxygen

B. Carbon

C. Copper

D. Hydrogen

E. Nitrogen

6. An organic nutrient that cannot be synthesized by the organism and must be provided is called a(n) ______.

A. element

B. trace element

C. growth factor

D. macronutrient

E. compound

7. Calcium is required for bacteria because it

A. stabilizes the ribosomes.

B. stabilizes the cell wall.

C. maintains cellular pH.

D. makes strong cell walls.

E. stabilizes the nucleoid.

8. Growth factors

A. are inorganic.

B. are synthesized by the organism.

C. contain elemental oxygen.

D. cannot be synthesized by the organism.

E. All of the choices are correct.

True / False Questions

9. Inorganic nitrogen must be converted to ammonia to be used by a cell.

True False