DO NOW

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DO NOW

• 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
OSMIUM TETROXIDE Stains lipids
EOSIN Stains cell cytoplasm
NILE BLUE Stains cell nuclei
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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.

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Diversity of Cells

• Objective
• 1) To compare Unicellular and Multicellular
  organisms

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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

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II. Unicellular Organisms

• A. Bacteria, protists, some algae
• B. One cell is responsible for entire work of
  keeping the organism alive
• 1. Hunt or make food
• 2. Breathe
• 3. Get rid of waste
• 4. Defense
• 5. Movement

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• C. Examples

2. Euglena
1. Paramecium
3. Amoeba
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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

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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 dont carry oxygen to muscles,
  muscles cant move
• c. Division of labor

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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