Question

Your teacher gives you an unknown bacterium to observe. Select the method that would help you determine whether the bacterium is a chemotroph.(1 point)
Responses

exposing the bacterium to carbon dioxide to see if it fixes carbon
exposing the bacterium to carbon dioxide to see if it fixes carbon

exposing the bacterium to direct sunlight to see if it converts light to chemical energy
exposing the bacterium to direct sunlight to see if it converts light to chemical energy

growing the bacterium in an agar tube filled with protein to see if it breaks the organic molecules down
growing the bacterium in an agar tube filled with protein to see if it breaks the organic molecules down

growing the bacterium in a sulfur solution to see if it breaks the inorganic molecules down

Answer 1

growing the bacterium in an agar tube filled with protein to see if it breaks the organic molecules down

This tests whether it obtains energy by oxidizing chemical (organic) compounds (chemoorganotrophy), which would identify it as a chemotroph (as opposed to a phototroph).