1. b (glycerol), c (a fatty acid) and i (phosphate)

2. either e or h would be acceptable; they are amino acids, though only one form is used for making proteins

3. e and h

4. a - this is alpha glucose

5. d - note this has only 5 carbons

6. a (alpha glucose) and f (fructose), or g (beta glucose) and f (fructose)

7. a and g

8. a and f (note - g is not used because sucrose is made with alpha glucose)

9. d (deoxyribose) and i (phosphate)

10. g (beta glucose)