1
it allows some substances to pass through, while keeping others out
2
membrane system of folded sacs and interconnected channels that serve as a site for protein and lipid synthesis
3
cells without a nucleus or other membrane bound organelles
4
contain a nucleus and other membrane-bound organelles
5
a flattened stack of membranes that modifies, sorts, and packages proteins
6
a special boundary that helps control what enters and leaves the cell
7
organelles that capture light energy
8
convert food particles into usable energy
9
supporting network of long, thin protein fibers that provide a framework for the cell and provide an anchor for the organelles
10
made of microtubules and function during cell division
11
specialized structures that carry out specific functions
12
the site of ribosome production within the nucleus
13
semifluid material inside the cell
14
digest excess or worn out organelles and food particles
15
thick, rigid, mesh of fibers that surrounds the outside of the plasma membrane, protects the cell, and gives it support
16
simple cell organelle that manufactures proteins
17
longer and less numerous than cilia; move in a whiplike motion
18
a sac that is used to store food, enzymes, and other materials
19
control center of the cell that contains the cell's genetic material
20
short, numerous projections that look like hairs and are used for motion
21
basic structural and functional unit of all living organisms
