Usually, Optical Tweezers Drag Integral Proteins a Limited Distance Before

Multiple Choice

Usually, optical tweezers drag integral proteins a limited distance before they encounter a barrier that causes their release; upon release, they typically spring backward. What does this suggest?

A) the presence of solid barriers
B) the presence of elastic barriers
C) the attachment of the proteins to the cytoskeleton
D) the attachment of the proteins to the endoplasmic reticulum
E) the presence of rubber in the membrane