Purple Photosynthetic Bacteria Do Not Contain Chloroplasts

question 24

Multiple Choice

Purple photosynthetic bacteria do not contain chloroplasts. They have an antenna system that includes two light- harvesting protein complexes, both of which are integral membrane proteins. The bacteriochlorophyll a molecules contain Mg²⁺ and absorb light at 800 nm. Which of the following statements comparing photosynthesis in purple bacteria and plant chloroplasts is true?

• A) Because purple bacteria do not have chloroplasts, there is no electron transport associated with photosynthesis.
• B) Plant chlorophyll a absorbs in the visible light range, whereas purple photosynthetic bacteriochlorophyll a absorbs light at a longer wavelength.
• C) Bacteriochlorophyll a absorbs light most efficiently in the ultraviolet range, at a significantly shorter wavelength than that for chlorophyll a of chloroplasts.
• D) Bacteriochlorophyll a is a molecule containing Mg²⁺, whereas chlorophyll a from chloroplasts contains Fe²⁺.

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