Question

Explain one difference between photosynthesis of bacteria and cynobacteria with the help of an equation

Answer 1

Answer:

Differences between Bacteria and Cyanobacteria. Cyanobacteria is also known as blue-green algae. They differ from other bacteria in that cyanobacteria possess chlorophyll-a, while most bacteria do not contain chlorophyll. Chlorophyll-a gives them their characteristic blue-green color.

Answer 2

The two forms of prokaryotes that lack membrane-bound organelles like the nucleus, mitochondria, chloroplasts, Golgi, ER, etc. are bacteria and cyanobacteria.

Difference between photosynthesis of bacteria and cyanobacteria are:

• Bacteria and cyanobacteria vary primarily in that the former are predominantly heterotrophs and the latter are predominantly autotrophs.

• Photosynthesis pigment is bacteriochlorophyll is present in bacteria, whereas cyanobacteria has chlorophyll a and b.
• Chlorophyll is contained in the grana of a chloroplast, enclosed by a double membrane; photosynthetic bacteria do not have membrane-bound chloroplasts. The photosynthetic pigment is found in the folds of the plasma membrane in bacteria in cyanobacteria.
• H₂S or other organic molecules are the reducing agents in bacteria, but H₂O is the reducing agent in cyanobacteria.
• Non-cyclic phosphorylation is common in bacteria, however cyclic phosphorylation is preferred in cyanobacteria.
• Oxygen is not produced by bacteria, although it is in cyanobacteria.
• Although the composition and structure of bacterial and plant photosynthetic systems vary, both involve light-dependent processes that result in atmospheric CO2 fixation.
• The variation in the electron donor is the primary distinction between bacterial and cyanobacteria photosynthesis.
• Since H₂O works as an electron donor in cyanobacteria but H₂S or thiosulfate does not in bacteria, oxygen is created in cyanobacteria photosynthesis but not in bacterial photosynthesis.
• Equation of photosynthesis in bacteria:
• 6CO₂ + 12H₂S ⟶ C₆H₁₂O₆ + 6H₂O + 12S  
• Equation of photosynthesis in cyanobacteria:
• 6C₂O + 12 H₂O + Light ——-> C₆H₁₂O₆ + 6O₂ + 6 H₂O

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