Form and Function B.1 Carbohydrates & Lipids (id: 30ca4f2a7)

本题目来源于试卷: Form and Function B.1 Carbohydrates & Lipids，类别为 IB生物学

[单选题]
Which of the following st/2bb.ncpp3-xc9za-m1u j)v/anlm z0 x ql z )ratementsc1v8em -s -lepx6x/szp50c vv describes alpha-Linolenate, as depicted in the d0 m1s/sevcxc v-xzl6e5p-v8p iagram below?

A. A saturated fatty acid
B. A mono-unsaturated fatty acid
C. A polyunsaturated fatty acid with cis bonds
D. A trans-fatty acid that is polyunsaturated


参考答案:  C


本题详细解析:

Alpha-Linolenate has more than one double bond in its carbon chain and is therefore a polyunsaturated fatty acid with cis bonds.

Since there is more than one double bond in the carbon chain of alpha-Linolenate it cannot be a saturated fatty acid (Choice A) or a mono-unsaturated fatty acid (Choice B). The double bonds are causing the chain to bend and have hydrogens on the same side of the double bond, hence the double bonds cannot be trans (Choice D).

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