What are the two major components of the tobacco mosaic virus?

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

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Describe how a student should adjust the microscope to see the cells on a slide more clearly?