Mrs. Ruhala set up an experiment where she tested for the presence of monosaccharides in food. She took a cracker, and it tested negative for monosaccharides. Then she put the cracker in her mouth, chewed it for a few minutes, and then spit it out into a test tube. It now tested positive for monosaccharides.

Question

What happened?

a
Mrs. Ruhala is a magical being and ewww.
b
An enzyme in her mouth broke down the polysaccharides in the cracker into monosaccharides.
c
The physical action of chewing broke down the lipids in the cracker and producing a positive reaction.
d
Water in the saliva catalyzed the cracker proteins and broke them into monosaccharides.

Answer 1

The correct answer is:

b. An enzyme in her mouth broke down the polysaccharides in the cracker into monosaccharides.

Chewing the cracker allowed enzymes in her saliva, particularly amylase, to break down starches (which are polysaccharides) into simpler sugars (monosaccharides), resulting in the positive test for monosaccharides after she chewed and spit out the cracker.