Cyanobacteria, green sulfur bacteria and purple sulfur bacteria all use photosystems and electron...
Cyanobacteria, green sulfur bacteria and purple sulfur bacteria all use photosystems and electron transport chains whey they carry out photosynthesis. From this you can conclude:
(a) Photosynthetic pathways are similar and arose independently.
(b) Photosynthetic pathways are very different and arose from a common ancestor.
(c) Photosynthetic pathways are identical and all bacteria are very closely related.
(d) Photosynthetic pathways are similar and arose from a common ancestor.
(e) Photosynthetic pathways are very different and arose independently.
Once Earth was first formed 4.6 billion years ago, there was no sign of life anywhere on the planet. However, over time the planet began to be filled with life and organisms, including the first plants that appeared over 470 million years ago.
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fromChapter 5 / Lesson 3
Photosynthesis is the process by which plants make their own food. Learn about photosynthesis and how it works, and discover the three ingredients that plants need to make their own food.
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