My last biology question for the night and I cant find it!?

Question

Why are humans unable to acquire metabolic energy from cellulose?

thank you to all who responded!!!!!!
GOODNIGHT!!!!!!!

Answer 1

The bonding of cellulose is different from that of the glucose humans use. Although they contain the same molecules, the bonding in cellulose is different from that of our simple sugars. Cellulose forms a beta-1,4 bond while glucose of simple human metabolism sugars forms alpha-1,4 bonds. This simple yet fundamental difference is the thing you're looking for. That bond cannot be broken down by our digestive enzymes. The alpha-1,4 bond however can be broken down. Therefore we can't break down cellulose and it can't enter the krebs cycle for us to derive energy from. Alpha1,4 sugars can be broken down and will enter the krebs cycle from which we derive our ATP energy.

Answer 2

the human body doesnt contain the enzyme which is used in digesting cellulose.
The ability to breakdown cellulose is not possessed by mammals. Typically, this ability is possessed only by certain bacteria (which have specific enzymes) like Cellulomonas. The body cannot break down the cellulose product without it. therefore digestion is not applied and the celluose is expelled from the body.
Other animals on the other hand, such as mainly strict herbavores (sheep and cows), contain and therefore allow adequate digestion of cellulose.

Answer 3

We don't have the bacteria or other microbial helpers in our systems to break the cellulose into its sugars. Cellulose molecules are huge polysaccharides. Even termites have protozoa inside them to help break down the cellulose.

Answer 4

this is bcoz hamans dont have tht digestive part in thr body which digests cellulose so it passes undigested in ur potty hence u dont get any energy from it ...animals like rabbits can digest it so they get energy from cellulose

Answer 5

Because humans don't have the enzymes required to digest glucose. It can only exit out of the body through the feces