Question

Compare glucose, fructose, and galactose. Select the true statements.
Fructose has a six-atom ring.
Only galactose has oxygen atoms.
All three molecules have six carbon atoms.
Glucose, fructose, and galactose are monosaccharides.

Answer 1

True:
- All three molecules have six carbon atoms. (They are hexoses: C6H12O6.)
- Glucose, fructose, and galactose are monosaccharides.

False:
- Fructose has a six-atom ring. (Typically fructose cyclizes to a five‑membered furanose ring in solution; a six‑membered pyranose form exists but is less common.)
- Only galactose has oxygen atoms. (All three contain oxygen atoms.)