Wild-type bacteria can grow on minimal medium. four mutants that cannot grow on minimal medium but can grow on minimal medium supplemented with the nutrient “c” are isolated. it is suspected that metabolites a, b, and d are in the biochemical pathway for synthesis of c, so each mutant is tested for the ability to grow on minimal medium supplemented with these metabolites.
mutant 1: can grow on minimal medium supplemented with a, but not b or d
mutant 2: is unable to grow on minimal medium supplemented with a, b, or d
mutant 3: is able to grow on minimal medium supplemented with b or a, but not d
mutant 4: can grow on minimal medium supplemented with a, b, or d.

which of the following is not consistent with this information?

a. mutant 2 will cause a build up of metabolite d
b. mutant 1 will cause a build up of metabolite b
c. mutant 3 blocks the conversion of metabolite d → metabolite b
d. mutant 2 blocks a step right before metabolite c.
e. mutant 4 blocks a step before all 4 metabolites.

Mutant 1 will cause a build up of metabolite A

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .