There seems to be a logical reason for the fact that in membranes, naturally occurring double bonds are "cis" and "trans." Why?
A. Producing "cis" double bonds requires less energy
B. "cis" double bonds have a "kinked" shape that enhances fluidity
C. "cis" double bonds bind more easily to "L" Amino Acids
D. In fact there is no reason, it was a random accident of nature
Answer: B