Cell regulation is conducted by special

carbohydrates

lipids

proteins

nucleic acids

The correct answer for the fill in the blank is- Proteins.

Regulation of cell is conducted by special proteins. Proteins are complex molecules that play significant role in the body as they are required for functions, structure, as well as regulation of cell.

These special proteins act like enzymes which help in driving various metabolic reactions ( like digestion of carbohydrates, proteins, and fats).

answer >   yes we do, women; have three holes, urethral opening(pee hole, vagina, and the women pee/girls pee out of the urethra like the men do; only they have a single opening to pee/ejaculate.   (sorry if i'm too forward with this, but this is for a biology class, isn't it? )

hope that !         : )