Which statements are true about polymers? Which statement best describes the role of phospholipids in the cells of living organisms?

A. They carry the instructions for cell processes.
B. They act as a source of fuel for cell processes.
C. They communicate information between cells.
D. They act as the building blocks for cell membranes.

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

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

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above