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

A lab technician needs
to determine whether
cells in a test tube are
prokaryotic or
eukaryotic. The
technician has several
dyes she could use to
stain the cells. Four of
the dyes are described
in the table to the right.
Which dye could the
technician use to
determine whether the
cells are prokaryotic or
eukaryotic?
DYE
TEST
ACRINIDE
ORANGE
Stains
DNA &
RNA
Stains
lipids
Stains cell
cytoplasm
Stains cell
nuclei
OSMIUM
TETROXIDE
EOSIN
NILE BLUE
Answer:
 Nile
Blue
 Only
eukaryotic cells have a nucleus.
All of the other tests (DNA & RNA,
cytoplasm and lipids) are
characteristics shared by pro- and
eukaryotes.
Diversity of Cells
Objective:
1) To compare Unicellular
and Multicellular
organisms
I. Organisms may be:
A. Unicellular organisms
1. 1 cell big
B. Multicellular organisms
1. More than 1 cell
2. Cells may be organized into tissues,
organs and systems
II. Unicellular Organisms
A. Bacteria, protists, some algae
B. One cell is responsible for entire
work of keeping the organism alive
1.
2.
3.
4.
5.
Hunt or make food
Breathe
Get rid of waste
Defense
Movement
C. Examples:
2. Euglena
1. Paramecium
3. Amoeba
III. Unicellular organisms have
specialized structures:
A. Movement:
1. Flagella
2. Cilia
3. Pseudopods
B. Contractile vacuoles – pump out
water
C. Method of eating – oral groove
IV. Multicellular Organisms
A. In most, cells are specialized to do a
specific job
1. Red Blood Cells carry oxygen
2. Muscle cells contract, allow for movement
B. These cells work together/rely on each
other for survival
1. If RBC don’t carry oxygen to muscles,
muscles can’t move
c. Division of labor
V. Colonial Organisms
A. Unicellular organisms that live in
groups
B. Attached to each other but have few
specialized structures
C. Bridge between uni and multicellular