Trans-fatty acids:
1 often created by treating plant oils with hydrogen is a true statement
2 cause the shape of fatty acids to be incorrect is a false statement
3 help membranes function normally is a false statement
4 occur naturally in in food is a true statement
Explanation:
Trans-fatty acids are unsaturated fatty acids obtained due to addition of a hydrogen molecule to vegetable oils by a process called hydrogenation.
The shape of fatty acids changes due to the hydrogenation process. The trans configuration of the unsaturated fatty acids gain one conjugated double bond and obtain a straight shape and corrects the bent shape formed due to cis bonds.
An increase in the trans-fatty acid levels especially in the membranes of the red blood cells will lead to clogging of the blood vessel itself and increases the risk for cardiac diseases. Trans fatty acids reduce the flexibility of the cell membranes and make it more rigid. The cell membranes should be flexible and the cellular molecules should be fluid for easy cellular transport of materials.
Natural foods like meat, dairy products contain trans fatty acids.
