A phototroph gets its energy from light, whereas a chemotroph gets its energy from chemical sources. An autotroph gets its carbon from CO2, HCO3-, etc, whereas a heterotroph gets its carbon from organic nutrients. The four nutritional modes are as follows: photoautotrophic, photoheterotrophic (which is unique to prokaryotes), chemoautotrophic (which is also unique to prokaryotes), and chemoheterotrophic.
Work Step by Step
Consider the four nutritional modes and categorize them according to which are unique to prokaryotic cells (photoheterotrophic and chemoheterotrophic).