反式脂肪是什么?

1.下面哪个关于反式脂肪的说法正确.(多选)
a.出现在植物油中
b.在部分氢化的过程中产生.
c.其碳氢键连接紧密如饱和脂肪..
d.不来自于动物.
e.在食物中的用量受到官方***.
f.比顺式脂肪更稳定.
2.下面哪个关于二肽gly-ala的说法正确?（不好意思全是英文,不过对着词典应该能大致看懂）
a.an amino group and an amide group are attached to the glycine (gly)
central (alpha) carbon.
b.an amino group and a carboxylic acid group are attached to the glycine
(gly) residue and the alanine (ala) residue.
c.the dipeptide gly-ala could have the amino group attached to the
glycine (gly) or to the alanine (ala).either way of writing it would be
correct.
d.a
carboxylic acid group and an amide group are attached to glycine (gly)
central (alpha) carbon.