Which of the following is NOT described by a fatty acid designated C18:3 n-3?

Question

BlackTom AI · Accepted Answer

Let’s break down what C18:3 n-3 means and evaluate each statement against that definition.
Option 1: It has 18 carbons in the carbon chain. This is true for C18:3 n-3, since the prefix 18 indicates an 18-carbon fatty acid backbone. So this option accurately describes the molecule.
Option 2: It has only 1 double bond located at the third carbon from the omega side. This is not consistent with C18:3 n-3. The designation 3 indicates there are three double bonds in the chain, not one, and the n-3 position means the first double bond is three carbons away from the omega end, not described here as a single bond at a specific third carbon. Therefore, this statement mischaracterizes the structure and is not describing C18:3 n-3.
Option 3: It is linolenic acid. This is true: linolenic acid is commonly used to refer to 18:3 n-3, so this option correctly describes the fatty acid.
Option 4: It has 3 double bonds in total. This is also true for C18:3 n-3, which by definition contains three double bonds along the 18-carbon chain.
In summary, the only statement that mismatches the characteristics of C18:3 n-3 is Option 2, because it asserts a single double bond at a specific position, whereas the designation specifies three double bonds and the omega-3 positioning instead of a solitary bond at that location.

Which of the following is NOT described by a fatty acid designated C18:3 n-3?单项选择题

类似问题

Which of the following is NOT described by a fatty acid designated C18:3 n-3?

Which ONE of the following thalamic nuclei is targeted by the trigeminothalamic tract?

Which ONE of the following is disinhibited in the direct pathway of the basal ganglia motor loop

30. What is the main purpose of the lecture?

Section FChoose a, b or c as the best answer.29. Which statement is the speaker most likely to agree with?

28. 15-minute neighbourhoods provide residents with inexpensive ____ .

27. ____ % of global car ownership is in the U.S.A.

26. ____ % of American drivers use their cars for all journeys.

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单