Saturated fatty acids have:
No double bonds is the scientifically accurate answer to this question. Within the study of Lipids without annotations, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of No double bonds directly address what is being asked. Among the other options, One or more double bonds, Only trans double bonds, and A rigid 30° bend in their chain do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 10