Steroid hormones enter a cell by simple diffusion. in doing so, these steroids

The answer is  D: Do not initiate cell signaling by interacting with a receptor in the plasma membrane. Signaling molecules that are large and cannot diffuse through the pores of the cell membrane are the ones that initiate internal cell signaling cascade by binding to receptors on the cell membrane.

the backbone of the dna and rna compound is sugar phosphate.