A(n) ________ is an example of a signal molecule that can bind to an intracellular receptor and thereby cause a gene to be turned on or off.
A) ion
B) protein
C) carbohydrate
D) nucleic acid
E) steroid
Answer: E
A(n) ________ is an example of a signal molecule that can bind to an intracellular receptor and thereby cause a gene to be turned on or off.
A) ion
B) protein
C) carbohydrate
D) nucleic acid
E) steroid
Answer: E