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The energy released by 1 gram of glucose is

  • A.6 kcal
  • B.4 kcal
  • C.5 kcal
  • D.3kcal

Answer: B

A gram of glucose releases about 4 kilocalories.

Carbohydrate and protein each yield about 4 kcal per gram and fat about 9. The complete oxidation of glucose gives \( \mathrm{C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O} \) and about 686 kcal per mole.

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