# Biochemical Pathways Question

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- A calorie is how much energy it takes to heat 1 gram of water 1 degree Celsius.
- A calorie is how much fire it takes to burn 1 gram of butter.
- A calorie is how much energy it takes to heat 2 grams of water by 3 degrees Celcius.
- A calorie is how much heat it takes to boil 1 gram of water.