Multiple Choice
Which of the following reactions is used to assess the effectiveness of antibiotics in the Kirby-Bauer test?
3. Acids and Bases
Organic Chemistry Reactions
Multiple Choice
In the context of organic chemistry reactions, what do some photosynthetic bacteria use as a source of electrons instead of water?
A
Carbon dioxide
B
Methane
C
Oxygen
D
Hydrogen sulfide
Verified step by step guidance1
Understand the context: Photosynthetic bacteria, such as purple and green sulfur bacteria, perform photosynthesis but do not use water as an electron donor.
Recognize the difference: Unlike plants, algae, and cyanobacteria that use water (H₂O) and release oxygen (O₂) as a byproduct, these bacteria use different compounds.
Identify the electron donor: In the case of some photosynthetic bacteria, hydrogen sulfide (H₂S) is used as the electron donor instead of water.
Explain the process: When hydrogen sulfide is used, it is oxidized, and sulfur or sulfate is produced as a byproduct instead of oxygen.
Conclude the understanding: This adaptation allows these bacteria to thrive in environments where water is not available or where hydrogen sulfide is abundant, such as in sulfur-rich hot springs or deep-sea vents.
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