Humans can digest starch but not cellulose because?

Question

Humans can digest starch but not cellulose because

a) the monomer of starch is glucose, while the monomer of cellulose is galactose.

b) humans have super enzymes that can hydrolyze the soft tissues of starch but not the hard tissues of cellulose.

c) humans have enzymes that can hydrolyze starch but not cellulose.

d) humans harbor starch-digesting bacteria in the digestive tract.

e) the monomer of starch is glucose, while the monomer of cellulose is maltose.

I think the answer is c?

Answer 1

You are correct.  The reason why animals like cows can digest grass is because the bacteria in their gut produce cellulases.

Answer 2

the answer is C.  We lack the enzym.  Of course, if we had bacteria in our stomach that could break down cellulose we may then be able to use it, but it would be the bacteria metabolizing it not us.

Answer 3

you are correct, it is indeed letter C. the absence of the enzyme cellulase, which breaksdown cellulose to monomers, is absent in humans which makes us unable to digest cellulose so it ends up being excreted together with our f***s.

Answer 4

The monomer of cellulose is glucose.

I think the right answer should be "Humans haven't the right bacteria for digesting cellulose as ruminants have." ;-)