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