What do some photosynthetic bacteria use as a source of electrons instead of water? a. Oxygen (O2) b. Hydrogen sulfide (H2S) c. Organic compounds (e.g., CH3COO−) d. Nitrate (NO3-)

Ch. 26 - Bacteria and Archaea

Freeman - Biological Science 8th Edition

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Freeman 8th Edition

Ch. 26 - Bacteria and Archaea

문제 1

26장, 문제 1

What do some photosynthetic bacteria use as a source of electrons instead of water?
a. Oxygen (O₂)
b. Hydrogen sulfide (H₂S)
c. Organic compounds (e.g., CH₃COO⁻)
d. Nitrate (NO₃^-)

검증된 단계별 안내

Understand that photosynthesis involves the transfer of electrons to convert light energy into chemical energy. In plants, water (H2O) is typically the electron donor.

Recognize that some photosynthetic bacteria do not use water as their electron source. Instead, they use other compounds to fulfill this role.

Consider the options given: oxygen (O2), hydrogen sulfide (H2S), organic compounds (e.g., CH3COO−), and nitrate (NO3-).

Recall that certain photosynthetic bacteria, such as purple sulfur bacteria, use hydrogen sulfide (H2S) as an electron donor instead of water.

Conclude that hydrogen sulfide (H2S) is the correct answer, as it is commonly used by some photosynthetic bacteria as a source of electrons.

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Photosynthesis in Bacteria

Photosynthesis in bacteria differs from that in plants, as some bacteria do not use water as an electron source. Instead, they utilize other compounds, allowing them to thrive in environments where water is scarce or where other electron donors are more abundant. This adaptation is crucial for their survival and ecological role.

Electron Donors in Photosynthesis

Electron donors are substances that provide electrons for the photosynthetic process. In some photosynthetic bacteria, compounds like hydrogen sulfide (H2S) or organic compounds are used instead of water. These alternative electron donors are essential for the bacteria's energy production and influence their habitat preferences.

Hydrogen Sulfide as an Electron Source

Hydrogen sulfide (H2S) is a common electron donor for certain photosynthetic bacteria, particularly those found in sulfur-rich environments. These bacteria oxidize H2S to obtain electrons, which are then used in their photosynthetic processes. This ability allows them to occupy ecological niches where other organisms might not survive.