10. The cell organelle that digests molecules, old organelles, and foreign substances is the
a. mitochondria
b. ER
c. Golgi apparatus
d. lysosomes
11. Organelle involved in the synthesis of steroids in glands and the breakdown of toxic waste:
a. soft ER
b. smooth ER
c. rough ER
d. mitochondria
12. The part of the cell that regulates movement of substances into and out of the cell is the
a. nucleus
b. cell membrane
c. Golgi apparatus
d. mitochondrion
13. Cells that have high energy requirement generally have many