When humans consume foods like lettuce, broccoli, and grains,
they cannot digest the large polysaccharide cellulose. Why is
that?
A.
cellulose is too large to absorb
B.
humans lack enzymes to break the bonds in cellulose
C.
stomach acid cannot act upon cellulose
D.
humans can digest cellulose, this is a trick
question
E.
both A and C are correct