How might an organism benefit by carrying Out fermentation instead of cellular respiration?

Answer 1

Organisms prefer cellular respiration over fermentation.

Cellular respiration gains a cell 38ATP molecules per every glucose molecule.

Fermentation only gains 2ATP per glucose molecule.

Obviously, you can see the difference. Cellular respiration provides much more energy for the cell, and this is why they prefer this over fermentation.

There are organisms like facultative anaerobes that can preform either process, but they do cellular respiration if oxygen is available. These organisms only preform fermentation if they are in an "oxygen debt." (Like when you run, you are using a lot of energy, and you cannot get enough oxygen for cellular respiration. You are in "oxygen debt," and your muscle cells start doing fermentation. But your muscle cells prefer using aerobic reparation (cellular respiration) so you start panting. Once you get your breath back, oxygen is restored and your cells again preform cellular respiration and get more energy faster.)

However, there are still obligate anaerobes that are poisoned by oxygen, and only use fermentation.

Hope this helped!!

Answer 2

fermentation needs only a bit of energy used not like cellular respiration.