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(a) Describe ONE characteristic of the plasma membrane that allows estrogens to passively cross the membrane.
It’s nonpolar/hydrophobic

(b) In a laboratory experiment, a researcher generates antibodies that bind to purified estrogen receptors extracted from cells. The researcher uses 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.
antibodies can’t bind to estrogen receptors because they can’t pass through the membrane
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