问答题
(南京大学2008年考研试题)Whenyoungratsareplaced0natotallyfat-freediet，theygrowpoody，developascalydermatitis，losehair，andsoondie—symptomsthatcanbepreventediflinoleateorplantmaterialisincludedinthediet．WhatmakeslinoleateanessentialfattyacidWhycanplantmaterialbesubstituted
【参考答案】
正确答案：必需脂肪酸是指人体内(或其他高等动物)不能自行合成、但又必须从食物中获得的脂肪酸。哺乳动物无法合成亚油酸是因为......
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