Estrogen, a hormone, is released by the ovaries. once released, it travels to cells where it has an influence on sexual development. in order for estrogen to achieve its purpose, it must a. travel using a transport protein to cross the cell membrane. b. travel through the cell membrane and bind to an intracellular receptor inside. c. estrogen does not need to cross the cell membrane to get to the nucleus. d. bind to a membrane receptor on the cell's surface.

The correct answer is B. travel through the cell membrane and bind to an intracellular receptor inside.

Estrogen is a type of steroidal hormone which plays many important role in female reproductive system and reproductive cycle.

Being steroidal in nature, it is fat-soluble due to which it easily passes across cell membrane (phospholipid bilayer) without the help of any carrier protein.

Within cell, it binds to the receptor present in the cytoplasm of the cell.

The receptor bound estrogen then passes across the nuclear membrane and binds to another receptor present on the chromatin.

There it produces its effects in terms of expressiveness of a particular gene.

i think its both a and b