Estrogens are small hydrophobic lipid hormones that promote cell division and the development ofreproductive structures in mammals. Estrogens passively diffuse across the plasma membrane and bindto their receptor proteins in the cytoplasm of target cells.(a) Describe ONE characteristic of the plasma membrane that allows estrogens to passively cross the membrane. (b) In a laboratory experiment, a researcher generates antibodies that bind to purified estrogen receptors extracted from cells. The researcher used the antibodies in an attempt to treat estrogen dependent cancers but finds that the treatment is ineffective. Explain the ineffectiveness of the antibodies for treating estrogen dependent cancers.