Question

galactose. compare glucose, fructose, and galactose. select the true statements. fructose has a six - atom ring. only galactose has oxygen atoms. glucose, fructose, and galactose are monosaccharides. all three molecules have six carbon atoms.

Explanation:

1. Fructose has a five - atom ring (not six - atom), so the first statement is false.
2. Glucose ($C_6H_{12}O_6$), fructose ($C_6H_{12}O_6$) and galactose ($C_6H_{12}O_6$) all contain oxygen atoms, so the second statement is false.
3. Glucose, fructose and galactose are simple sugars, i.e., monosaccharides, so the third statement is true.
4. The molecular formula of all three is $C_6H_{12}O_6$, so they all have six carbon atoms, and the fourth statement is true.

Answer:

Glucose, fructose, and galactose are monosaccharides.
All three molecules have six carbon atoms.