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)
exposing the bacterium to carbon dioxide to see it it fixes carbon
growing the bacterium in an agar tube filled with protein to see if it breaks the organic
growing the bacterium in a sulfur solution to see if it breaks the inorganic molecules down
exposing the bacterium to direct sunlight to see if it converts light to chemical energy

Answer 1

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

Explanation: chemotrophs obtain energy from chemical compounds. Testing growth on inorganic electron donors (e.g., sulfur) identifies chemolithotrophy. The sunlight test checks for phototrophy; CO2 fixation tests autotrophy; protein agar tests heterotrophy (organic-carbon use).