Unlike nonsteroid hormones, steroid hormones a. bind to receptors on the outside of cell membranes. b. enter the nucleus and change gene expression in a target cell. c. include proteins and modified amino acids. d. can't pass through cell membranes.

Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Dna is colied into chromosomes in a cell

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy