Which one of the following is not a fuel produced by microorganisms?
a. Algal oil
b. Ethanol
c. Hydrogen
d. Methane
e. Uranium

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Which one of the following is not a fuel produced by microorganisms?
a. Algal oil
b. Ethanol
c. Hydrogen
d. Methane
e. Uranium
The manufacture of paper includes the use of bleach and formaldehyde-based glue. The microbial enzyme xylanase whitens paper by digesting dark lignins. Oxidase causes the fibers to stick together, and cellulase will remove ink. List three advantages of using these microbial enzymes over traditional chemical methods for making paper.
Which of the following reactions is an oxidation carried out by A. ferrooxidans?
a. Fe²⁺ → Fe³⁺
b. Fe³⁺ → Fe²⁺
c. CuS→ CuSO₄
d. Fe⁰ → Cu⁰
e. None of the above
Which of the following reactions is undesirable in winemaking?
a. Sucrose → ethanol
b. Ethanol → acetic acid
c. Malic acid → lactic acid
d. Glucose → pyruvic acid
Which type of radiation is used to preserve foods?
a. Ionizing
b. Nonionizing
c. Radiowaves
d. Microwaves
e. All of the above
Label the trophophase and idiophase in this graph. Indicate when primary and secondary metabolites are formed.