A. It is often stated that H2S and methane (CH4) gases are produced by anaerobic

Question

A. It is often stated that H2S and methane (CH4) gases are produced by anaerobic bacteria that ferment sugars. However, colon bacteria, or coliforms, such as E. coli ferment sugars to acids and C02 gas.

Colon bacteria that produce H2S actually do so using which of the following pathways?

a. aerobic respiration

b. anaerobic respiration

c. photosynthesis

d. autotrophic methanogenesis

B. Which of the following can be the carbon source for the H2S producing pathway identified in your answer to the previous question?

a. hydrogen gas

b. elemental sulfur

c. carbon dioxide

d. glucose

C. This carbon source is ____. (organic or inorganic)

D. The electron source for this H2S producing pathway is (hydrogen gas, elemental sulfur, carbon dioxide, or glucose) which is in a fully (reduced or oxidized) state in its role as an electron source.

E. The electron acceptor for this H2S producing pathway is (hydrogen gas, elemental sulfur, carbon dioxide, or glucose) which is an (organic or inorganic) molecule in a fully (reduced or oxidized) state in its role as an electron acceptor.

Explanation / Answer

Q.A - CORRECT OPTION WOULD BE "B" ANAEROBIC RESPIRATION. AS H2S IS PRODUCED BY SULFATE-REDUCING BACTERIA, WHICH USE SULPHATE AS TERMINAL ELECTRON ACCEPTOR FOR REDUCTION AND REDUCE SULFUR TO HYDROGEN SULPHIDE. AS IT USES SULFUR ITS ANAEROBIC REACTION.

Q. B- "C" AS CO2 CAN BE USED AS AN ELECTRON ACCEPTOR INSTEAD OF ELEMENTAL SULFUR

Q C- CO2 IS INORGANIC

Q.D ELECTRON SOURCE IS HYDROGEN GAS AND IS BEING OXIDIZED

Q E ELECTRON ACCEPTOR IS ELEMENTAL SULPHUR WHICH IS INORGANIC AND IS REDUCED

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