Question

testosterone is a small steroid hormone that is important in cell signaling. which of the following describes where testosterone enters a cell and why it is able to cross at that point?
a 1, testosterone is nonpolar and can diffuse through the membrane.
b 2, testosterone covalently binds to a surface protein and transports into the cell.
c 3, testosterone dissolves in water and flows through the channel.
d 4, testosterone is filtered out of the extracellular fluid and taken into the cell by endocytosis

Explanation:

Steroid hormones like testosterone are non - polar. The cell membrane is composed of a lipid bilayer. Non - polar molecules can diffuse through the non - polar lipid bilayer of the cell membrane.

Answer:

A. 1, testosterone is nonpolar and can diffuse through the membrane.