Photosynthetic bacteria that also fix nitrogen are:
a. Mycoplasmas
b. Spirilla
c. Bacteroids
d. Cyanobacteria

검증된 단계별 안내

Understand the key terms in the question: 'photosynthetic bacteria' are bacteria that can perform photosynthesis, and 'fix nitrogen' means converting atmospheric nitrogen (N₂) into a form usable by living organisms, such as ammonia.

Recall that mycoplasmas are bacteria without cell walls and are not known for photosynthesis or nitrogen fixation, so option (a) can be ruled out.

Spirilla are spiral-shaped bacteria, but they are not typically photosynthetic nor known for nitrogen fixation, so option (b) is unlikely.

Bacteroids are differentiated forms of rhizobia bacteria inside legume root nodules that fix nitrogen but are not photosynthetic, so option (c) is not correct.

Cyanobacteria are well-known for their ability to perform oxygenic photosynthesis and some species can fix nitrogen, making option (d) the correct choice.

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주요 개념

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Photosynthetic Bacteria

Photosynthetic bacteria are microorganisms that can convert light energy into chemical energy through photosynthesis. Unlike plants, some bacteria use different pigments and pathways, such as bacteriochlorophyll, to capture light. Cyanobacteria are a well-known group of photosynthetic bacteria that produce oxygen as a byproduct.

Nitrogen Fixation

Nitrogen fixation is the biological process where certain bacteria convert atmospheric nitrogen (N2) into ammonia (NH3), a form usable by plants. This process is essential for the nitrogen cycle and supports plant growth. Some bacteria, including certain cyanobacteria, have specialized enzymes called nitrogenases to perform this function.

Cyanobacteria

Cyanobacteria are a group of photosynthetic bacteria capable of oxygenic photosynthesis and nitrogen fixation. They possess specialized cells called heterocysts that provide an anaerobic environment for nitrogenase activity. Cyanobacteria play a crucial role in aquatic ecosystems and soil fertility by contributing both oxygen and fixed nitrogen.

Photosynthetic bacteria that also fix nitrogen are:a. Mycoplasmasb. Spirillac. Bacteroidsd. Cyanobacteria