The CELL is the basic unit of life' All organisms are made of one or more cells Unicellular one cell

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The CELL is the basic unit of life.   All
organisms are made of one or more cells
Unicellular (one celled) or Multi-cellular
(more than one cell)  

• lt--Unicellular Multi-cellular--gt

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Unicellular Organisms

• Protists
• Paramecium
• Amoeba
• Bacteria
• E-coli
• Salmonella
• Fungi (some)
• Yeast
• Viruses???
  

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Paramecium

P. caudatum intact cells 206-260 µm
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Amoeba
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Reproduction

• Process whereby all living organisms produce
  offspring. Reproduction is one of the essential
  life functions of plants, animals, and single
  celled organisms.

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Reproduction in Paramecium

• Conjugation in Paramecium

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Reproduction of an Amoeba

• The single-celled amoeba demonstrates a simple
  method of asexual reproduction it divides in
  half by a process called fission, producing two
  smaller daughter cells.

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BINARY FISSION REPRODUCTION IN AMOEBA
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LocomotionMovement is achieved by several
different methods in the protists.

• Cilia - Microscopic hair like projections
  extending from the surface of a cell or
  unicellular organism. Capable of rhythmical
  motion, they act in unison to bring about the
  movement of the cell or of the surrounding medium

Paramecium
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Flagella

• A long, threadlike appendage, especially a whip
  like extension of certain cells or unicellular
  organisms, found singly or in pairs.

Euglena
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Pseudopodia

• A temporary projection of the cytoplasm of
  certain cells, or of certain unicellular
  organisms, especially amoebas.

Amoeba
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Digestion

• A protozoa takes in food via the water and stores
  the food in sacs called vacuoles. They eat tiny
  algae and bacteria.

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Respiration

• A protozoa takes in oxygen and gives off carbon
  dioxide through the cell membrane.

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Answer the questions on your Handout

• How are Unicellular organisms different from
  multicellular organisms?