Multiple choice

In purple sulphur bacterial photosynthesis, ________.

  1. water provides the electrons

  2. organic substance is electron donor

  3. hydrogen sulfide provides the electrons

  4. oxygen is not released

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chromatiaceae is a family of purple sulphur bacteria. e.g. Chromatium. These are short, Gram-negative rods, ~1 µm in diameter and 3-4 µm long. They are able to use sulphur and sulphide, as the sole photosynthetic electron donor and sulphur can be oxidized to sulphate. These bacteria use an inorganic sulphur compound, such as, hydrogen sulfide, as an electron donor.

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