During hydrogenation, cis double bonds are converted to trans double bonds. In the lab, we compare three fats, each of which has fatty acid chains that are exactly the same length (number of carbons) and observe the following: Fat 1 contains only saturated fatty acids 16 carbons long, and has a melting point of 65 degrees C. Fat 2 contains only cis unsaturated fatty acids 16 carbons long, and has a melting point of 35 degrees C. Fat 3 contains only trans fatty acids 16 carbons long, and has a melting point of 65 degrees C. Both Fat 2 and Fat 3 contain fatty acids with a single double bond; fat 1 has no double bonds. Why do Fat 3 and Fat 1 have more similar melting points than Fat 3 and Fat 2? Group of answer choices The number of hydrogen atoms in the fatty acids of fats 1 & 3 is higher, and having more hydrogen atoms raises the melting point of the fat. The fatty acids in fats 1 & 3 have a linear shape, so they pack tightly together and have lots of hydrophobic interactions, raising their melting point compared to fat 2, which has bent fatty acids. The fatty acids in fats 1 & 3 have greater chemical stability and are harder to break down than the fatty acids in fat 2, which raises their melting point. Fats 1 & 3 have more cholesterol, which raises their melting point compared to fat 2, which does not have much cholesterol.

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question

During hydrogenation, cis double bonds are converted to trans double bonds. In the lab, we compare three fats, each of which has fatty acid chains that are exactly the same length (number of carbons) and observe the following:

Fat 1 contains only saturated fatty acids 16 carbons long, and has a melting point of 65 degrees C.
Fat 2 contains only cis unsaturated fatty acids 16 carbons long, and has a melting point of 35 degrees C.
Fat 3 contains only trans fatty acids 16 carbons long, and has a melting point of 65 degrees C.

Both Fat 2 and Fat 3 contain fatty acids with a single double bond; fat 1 has no double bonds. Why do Fat 3 and Fat 1 have more similar melting points than Fat 3 and Fat 2?

Group of answer choices

The number of hydrogen atoms in the fatty acids of fats 1 & 3 is higher, and having more hydrogen atoms raises the melting point of the fat.

The fatty acids in fats 1 & 3 have a linear shape, so they pack tightly together and have lots of hydrophobic interactions, raising their melting point compared to fat 2, which has bent fatty acids.

The fatty acids in fats 1 & 3 have greater chemical stability and are harder to break down than the fatty acids in fat 2, which raises their melting point.

Fats 1 & 3 have more cholesterol, which raises their melting point compared to fat 2, which does not have much cholesterol.