Why is it that steroid hormones use receptors inside of target cells, whereas protein, peptide, and amino acid hormones do not?

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the

What is a difference between systemic and pulmonary circulation? a. systemic circulation carries oxygenated blood to the lungs and pulmonary circulation carries deoxygenated blood to the body. b. systemic circulation carries deoxygenated blood to the lungs and pulmonary circulation carries oxygenated blood to the body. c. systemic circulation carries deoxygenated blood to the body and pulmonary circulation carries oxygenated blood to the lungs. d. systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.

How are viruses different from eukaryotic cells?