我份 Bio note有一條問題
If one gram of the following foods were eaten , which one would give the most energy?
A white bread
B butter
C pork
D sugar
答案係 B ，但我不明點解。請解釋。
中三簡單生物問題---------10 分
2007-12-14 3:55 am
回答 (2)
2007-12-15 6:42 am
✔ 最佳答案
White bread consists mainly of starch. Starch is a kind of carbohydrates, polysaccharide.Butter is a kind of lipids (fat).
Pork is made up of protein with some fat.
Sugar is carbohydrates. It is either monosaccharide or disaccharide.
Approximate amount of energy released on complete oxidation(kJ/g)
Carbohydrates 17
Lipids 38
Protein 17
Comparing carbohydrates, lipids and protein, oxidation of lipids produce the largest amount of energy per gram among the 3 food substances.
2007-12-14 4:43 am
因為butter係fat,相同重量fat提供ge能量>蛋白質(protein)>碳水化合物(carbohydrate)
white bread係carbohydrate,pork係protein,sugar係carbohydrate
white bread係carbohydrate,pork係protein,sugar係carbohydrate
參考: 自己
收錄日期: 2021-04-19 00:06:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071213000051KK03040