Question

Here is question 4 with the answer: Colon bacteria that produce H2S produce actually do so by using anaerobic respiration pathway.

Please answer question 11-14, thank you!

11. Some other colon prokaryotes are able to generate methane (CH4) using a different metabolic pathway than the one you identified in Question #4. These prokaryotes can use which of the following metabolic pathways?

a. aerobic respiration

b. anaerobic respiration

c. photosynthesis

d. autotrophic methanogenesis

12. The carbon source for methane (CH4) production using the metabolic pathway identified in Question #11 is:

a. hydrogen gas (H2)

b. elemental sulfur (S)

c. carbon dioxide (CO2)

d. glucose (C6H12O6)

13. The electron donor for methane (CH4) production using the metabolic pathway identified in Question #11 is ____(hydrogen gas/elemental sulfur/carbon dioxide/glucose), which is an ____(organic or inorganic) molecule that is in a fully ____(oxidized or reduced) state in its role as an electron donor.

14. The final electron acceptor for methane (CH4) production using the metabolic pathway identified in Question #11 is:

a. glucose (C6H12O6)

b. carbon dioxide (CO2)

c. elemental sulfur (S)

d. hydrogen gas (H2)

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Lactase (Beta-Galactosidase), Great Vista Chemicals (http://www.greatvistachemicals.com/biochemicals/lactase.html)

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Answer 1

11. Colon prokaryotes are able to generate methane using a different metabolic pathway than anaerobic respiration. These prokaryotes make use of autotrophic methanogenesis.

Hence, the correct option is d. autotrophic methanogenesis.

12. Carbon dioxide is the source of carbon for methane in autotrophic methanogenesis.

Hence, the correct option is c. carbon dioxide (CO₂).

13. The electron donor for methane (CH4) production using the metabolic pathway identified in Question #11 is hydrogen gas, which is an inorganic molecule that is in a fully reduced state in its role as an electron donor.

14. Hence, the correct option d. hydrogen gas (H2).