Question

What molecules can produce more energy per gram than sugars and are used for storing energy in animals?
A. carbohydrates
B. proteins
C. lipids
D. hydrocarbons

Answer 1

the answer is lipids

Answer 2

The answer is C: Lipids. Because:

1 gram of carbohydrates provides 17 kJ of energy per gram.

1 gram of protein provides 17 kJ of energy per gram.

1 gram of fat provides 37 kJ of energy per gram.

Hydrocarbon is a fuel so it is not stored in animals.