如何有效作答問題?
食物和人類(Food and human)
留意如何答法才能取得分數。其實這也是有效作答的技巧! 不純綷祇是考試答題技巧。
問題(10)
所有蛋白質皆由氨基酸組成，但為何不同蛋白質食物的營養價值不同?(3 分)
不理會身體對不同的蛋白質消化能力不同。
All proteins are composed of amino acids. Then why different proteins have different nutritional value?(3 marks)
[建議答案]
不同的蛋白質食物有不同比例的必需及非必需氨基酸(1分)，(留意，不可寫有不同營養)(但為何跟必需氨基酸有關?)
人體內不能自行制造必需氨基酸(1分)，(那又如何?)
必需從外界進食。(1分)(因此，甚麼成份的食物營養價值較高?)
因此，含有較多比例必需氨基酸的食物對人類而言營養價值較高。(1分)(那即是甚麼食物? 動物抑或植物性食物平均較有營養?)
Different protein foods have different ratio of essential and non-essential amino acids.
We cannot synthesize essential amino acids in our body.
We must take in the essential amino acids from the food.
Therefore, the food with higher ratio of essential amino acids have higher nutritional value for human.
問題(11)
以下哪些食物的蛋白質營養價值較高? 試加以解釋。(4分)
Which of the following protein foods have higher nutritional value? Briefly Explain.(4 marks)
[建議答案]
豬肉(1分)(因為選對了)(但為甚麼?)
豬肉應含有較多必需氨基酸(1分)，(如何推論出來?)
豬肉的蛋白質應最接近人類(1分)，(為甚麼?)
豬與人皆是哺乳類(1分)，組成成分應最接近。
Pork.(1)
Pork should have more essential amino acids.(1)
The proteins in pork are more like that in human.(1)
Because both pig and human are mammals.(1)
問題(12)
根據研究，最近30年來，中國人平均身高增長最多。試加以解釋。(3分)
According to a research, the increase of the average height of Chinese is the highest in the world. Briefly explain.(3 marks)
[建議答案]
近30年吸收營養增多(這樣沒有分數的! 是甚麼營養?)
進食的蛋白質量增加，(1分)尤其是肉類。為甚麼?
蛋白質是生長的材料，(1分)(所以單靠進食碳水化合物不能長高)
進食蛋白質可組成更多肌肉(1分)，使身型更高大。
In recent 30 years, Chinese take in more protein in their diet. (1 mark)
Protein is used as material for growth.
Taking in more protein can make up more muscles in humans and the Chinese people become taller and stronger.
