a. DNA k. microtubules
b. proteins l. rough ER
c. nucleus m. smooth ER
d. nucleolus n. solar energy
e. modify o. protein fibers
f. digestion p. large vacuole
g. cellulose q. Golgi apparatus
h. channels r. microfilaments
i. vacuoles s. intermediate filaments
j. mitochondria t. endomembrane system


The (1) _______ is the cell’s genetic control center. The nucleus houses the
cell’s (2) _____ and directs protein synthesis by making messenger RNA. The (3)
_________ makes the subunits of ribosomes. Ribosomes synthesize (4) ________
according to the directions from DNA. Many organelles are connected through the
(5) ____________ ______. (6) ______ __ synthesizes lipids and processes toxins. (7)
_____ __ manufactures membranes and ribosomes on its surface, produce
membranes and secretory proteins. The (8) _____ __________ consists of stacks of
sacs that (9) ______ ER products and then ship them to other organelles or to the
cell surface. Lysosomes house enzymes that function in (10) _________ and recycling
within the cell. Plant cells contain a (11) _____ _______that stores molecules ad
wastes and facilitates growth. While animal cells have small and numerous (12)
________ that function in the general maintenance of the cell. The organelles of the
endomembrane system are interconnected structurally and functionally. (13)
___________ is the main organelle in animal cell responsible in harvesting chemical
energy from food while chloroplasts in plant convert (14) _____ _______ to chemical
energy. The cell’s internal skeleton helps organize its structure and activities. The
cytoskeleton is a network of (15) _______ _______. (16) _______________ of actin enable
cells to change shape and move. (17) ___________ ________ reinforce the cell and
anchor certain organelles. (18) ____________ give the cell rigidity and acts as tracks
for organelle movement. Plant cell walls are made largely of (19) _________.
Plasmodesmata are connecting (20) ________ between plant cells.