During the light reactions of photosynthesis, _____acts as a chief energy source and ____acts as an electron and proton donor.

Photosynthetic bacteria, such as green and purple sulfur bacteria, use____as a source of protons and electrons and release____ as a by-product during photosynthesis:

Which below statement/s can be considered true regarding photoautotrophic bacteria

All of the following involve metabolic functions among prokaryotes except

Which of the factors about how prokaryotic organisms adapt to environmental changes is false?

Microbes that aid in digestion and have a positive impact on the intestinal microbial balance of the host are termed as _______________.

Some bacteria depend on other organisms for nutrition. They are called