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2.4F: Inclusion Bodies and Organelles Used for Photosynthesis

Skills to Develop

  1. Name three major types of photosynthetic bacteria and briefly describe where its photosynthetic system is located.
  2. State the function of the following inclusion bodies:
    1. cyanophycin granules
    2. carboxysomes
    3. gas vacuoles
    4. polyhydroxybutyrate and glycogen granules
    5. magnetosomes
    6. volutin granules and sulfur granules

There are several major groups of photosynthetic bacteria: cyanobacteria, purple bacteria, green sulfur bacteria, green nonsulfur bacteria, heliobacteria, and acidobacteria. Comparing the cyanobacteria, the purple bacteria, and the green bacteria:

The cyanobacteria carry out oxygenic photosynthesis, that is, they use water as an electron donor and generate oxygen during photosynthesis. The photosynthetic system is located in an extensive thylakoid membrane system that is lined with particles called phycobilisomes that contain light-harvesting phycobiliproteins.

The green bacteria carry out anoxygenic photosynthesis. They use reduced molecules such as H2, H2S, S, and organic molecules as an electron source and generate ATP, NADH and NADPH. The photosynthetic system is located in ellipsoidal vesicles called chlorosomes that are independent of the cytoplasmic membrane.

The purple bacteria carry out anoxygenic photosynthesis. They use reduced molecules such as H2, H2S, S, and organic molecules as an electron source and generate ATP, NADH and NADPH. The photosynthetic system is located in spherical vesicles called chromatophores or lamellar membrane systems that are continuous with the cytoplasmic membrane.

Other Inclusion Bodies

Summary

  1. Oxygenic photosynthesis uses water as an electron donor and generates oxygen during photosynthesis.
  2. The cyanobacteria carry out oxygenic photosynthesis.
  3. Anoxygenic photosynthesis uses reduced molecules such as H2, H2S, S, and organic molecules as an electron source and generates ATP, NADH and NADPH.
  4. The green bacteria and the purple bacteria carry out anoxygenic photosynthesis.
  5. Various inclusion bodies are found in certain bacteria that carry out different specialized functions.

Questions

Study the material in this section and then write out the answers to these questions. Do not just click on the answers and write them out. This will not test your understanding of this tutorial.

  1. Matching

    _____ Carry out oxygenic photosynthesis, that is they use water as an electron donor and generate oxygen during photosynthesis.The photosynthetic system is located in an extensive thylakoid membrane system that is lined with particles called phycobilisomes. (ans)

    _____ Carry out anoxygenic photosynthesis. They use reduced molecules such as H2, H2S, S, and organic molecules as an electron source and generate NADH and NADPH. The photosynthetic system is located in spherical or lamellar membrane systems that are continuous with the cytoplasmic membrane. (ans)

    _____ Carry out anoxygenic photosynthesis. They use reduced molecules such as H2, H2S, S, and organic molecules as an electron source and generate NADH and NADPH. The photosynthetic system is located in ellipoidal vesicles called chlorosomesthat areindependent of the cytoplasmic membrane. (ans)

    1. green bacteria
    2. purple bacteria
    3. cyanobacteria
  2. Matching

    _____ inclusion bodies that store nitrogen (ans)

    _____ inclusion bodies that serve as an energy reserve (ans)

    _____ inclusion bodies that store phosphate (ans)

    _____ inclusion bodies that let aquatic bacteria regulate buoyancy (ans)

    1. cyanophycin granules
    2. carboxysomes
    3. gas vacuoles
    4. polyhydroxybutyrate and glycogen granules
    5. magnetosomes
    6. volutin granules

Contributors

  • Dr. Gary Kaiser (COMMUNITY COLLEGE OF BALTIMORE COUNTY, CATONSVILLE CAMPUS)