Concept:A six-carbon compound contains exactly six carbon atoms per molecule. Identify the carbon count of each substance to find the correct group.
Explanation:Glucose is a hexose monosaccharide with six carbon atoms:
C6H12O6.
Lactose is a disaccharide made from glucose and galactose, so its formula is
C12H22O11, meaning it has twelve carbon atoms, not six.
Cellulose is a polysaccharide built from many repeating
C6H10O5 units, so its whole molecule has many carbon atoms, not exactly six.
Pyruvate is a three-carbon compound:
C3H4O3.
The group that contains substances that are not six-carbon compounds is pyruvate and cellulose.
Answer:D. Pyruvate and cellulose