KEY CONCEPT Cells are the Basic unit of life.

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• KEY CONCEPT Cells are the Basic unit of life.

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• The cell theory grew out of the work of many
  scientists and improvements in the microscope.

• Many scientists contributed to the cell theory.

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• The cell theory grew out of the work of many
  scientists and improvements in the microscope.
• Many scientists contributed to the cell theory.
• More was learned about cells
  as microscopes
  improved.

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• The cell theory grew out of the work of many
  scientists and improvements in the microscope.
• Many scientists contributed to the cell theory.
• More was learned about cells
  as microscopes
  improved.
• The cell theory is a unifying
  concept of biology.

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• Early studies led to the development of the cell
  theory.

• The Cell theory has three principles.
• All organisms are made of cells.

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• Early studies led to the development of the cell
  theory.

• The Cell theory has three principles.
• All organisms are made of cells.
• All existing cells are produced by other living
  cells.

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• Early studies led to the development of the cell
  theory.
• The Cell theory has three principles.
• All organisms are made of cells.
• All existing cells are produced by other living
  cells.
• The cell is the most basic unit of life.

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• Prokaryotic cells lack a nucleus and most
  internal structures of eukaryotic cells.
• All cells share certain characteristics.

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• Prokaryotic cells lack a nucleus and most
  internal structures of eukaryotic cells.
• All cells share certain characteristics.
• Cells tend to be microscopic.

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• Prokaryotic cells lack a nucleus and most
  internal structures of eukaryotic cells.
• All cells share certain characteristics.
• Cells tend to be microscopic.
• All cells are enclosed
  by a membrane.

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• Prokaryotic cells lack a nucleus and most
  internal structures of eukaryotic cells.
• All cells share certain characteristics.
• Cells tend to be microscopic.
• All cells are enclosed
  by a membrane.
• All cells are filled with
  cytoplasm.

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• There are two cell types eukaryotic cells and
  prokaryotic cells.

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• There are two cell types eukaryotic cells and
  prokaryotic cells.
• Eukaryotic cells have a
  nucleus.

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• There are two cell types eukaryotic cells and
  prokaryotic cells.
• Eukaryotic cells have a
  nucleus.
• Prokaryotic cells do
  not have membrane-
  
  bound organelles.

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• There are two cell types eukaryotic cells and
  prokaryotic cells.
• Prokaryotic cells do not
  have a nucleus.

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• There are two cell types eukaryotic cells and
  prokaryotic cells.
• Prokaryotic cells do not
  have a nucleus.
• Prokaryotic cells do not
  have membrane-bound
  
  organelles.

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• KEY CONCEPT Eukaryotic cells share many
  similarities.

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• Cells have an internal structure.

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• Cells have an internal structure.
• The cytoskeleton has many functions.

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• Cells have an internal structure.
• The cytoskeleton has many functions.
• supports and shapes cell

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• Cells have an internal structure.
• The cytoskeleton has many functions.
• supports and shapes cell
• helps position and transport organelles

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• Cells have an internal structure.
• The cytoskeleton has many functions.
• supports and shapes cell
• helps position and transport organelles
• provides strength

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• Cells have an internal structure.
• The cytoskeleton has many functions.
• supports and shapes cell
• helps position and transport organelles
• provides strength
• assists in cell division

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• Cells have an internal structure.
• The cytoskeleton has many functions.
• supports and shapes cell
• helps position and transport organelles
• provides strength
• assists in cell division
• aids in cell movement

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• Several organelles are involved in making and
  processing proteins.

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• Several organelles are involved in making and
  processing proteins.
• The nucleus stores genetic information.

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• Several organelles are involved in making and
  processing proteins.
• The nucleus stores genetic information.
• Many processes occur in the endoplasmic reticulum.

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• Several organelles are involved in making and
  processing proteins.
• The nucleus stores genetic information.
• Many processes occur in the endoplasmic
  reticulum.
• There are two types of endoplasmic reticulum.

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• Several organelles are involved in making and
  processing proteins.
• The nucleus stores genetic information.
• Many processes occur in the endoplasmic
  reticulum.
• There are two types of endoplasmic reticulum.
• rough endoplasmic
  reticulum

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• Several organelles are involved in making and
  processing proteins.
• The nucleus stores genetic information.
• Many processes occur in the endoplasmic
  reticulum.
• There are two types of endoplasmic reticulum.
• rough endoplasmic
  reticulum
• smooth endoplasmic
  reticulum

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• Several organelles are involved in making and
  processing proteins. (continued)

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• Several organelles are involved in making and
  processing proteins. (continued)
• Ribosomes link amino acids to form proteins.

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• Several organelles are involved in making and
  processing proteins. (continued)
• Ribosomes link amino acids to form proteins.
• Vesicles are membrane-bound sacs that hold
  materials.

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• Other organelles have various functions.

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• Other organelles have various functions.
• Mitochondria supply energy to the cell.

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• Other organelles have various functions.
• Mitochondria supply energy to the cell.
• Vacuoles are fluid-filled sacs that hold
  materials.

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• Other organelles have various functions.
• Mitochondria supply energy to the cell.
• Vacuoles are fluid-filled sacs that hold
  materials.
• Lysosomes contain enzymes to digest material.

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• Other organelles have various functions.
• Mitochondria supply energy to the cell.
• Vacuoles are fluid-filled sacs that hold
  materials.
• Lysosomes contain enzymes to digest material.
• Centrioles are tubes found in the
  centrosomes.

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• Other organelles have various functions.
• Mitochondria supply energy to the cell.
• Vacuoles are fluid-filled sacs that hold
  materials.
• Lysosomes contain enzymes to digest material.
• Centrioles are tubes found in the centrosomes.
• Centrioles help divide
  DNA.

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• Other organelles have various functions.
• Mitochondria supply energy to the cell.
• Vacuoles are fluid-filled sacs that hold
  materials.
• Lysosomes contain enzymes to digest material.
• Centrioles are tubes found in the centrosomes.
• Centrioles help divide
  DNA.
• Centrioles form cilia and
  flagella.

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• Plant cells have cell walls and chloroplasts.

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• Plant cells have cell walls and chloroplasts.
• A cell wall provides rigid support.

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• Plant cells have cell walls and chloroplasts.
• A cell wall provides rigid support.
• Chloroplasts convert solar energy to chemical
  energy.

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• KEY CONCEPT The cell membrane is a barrier that
  separates a cell from the external environment.

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• Cell membranes are composed of two phospholipid
  layers.

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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane has two major functions.

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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane has two major functions.
• forms a boundary between inside and outside of
  the cell

outside cell
inside cell
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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane has two major functions.
• forms a boundary between inside and outside of
  the cell
• controls passage of materials

outside cell
inside cell
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• Cell membranes are composed of two phospholipid
  layers.

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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane is made of a phospholipid
  bilayer.

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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane is made of a phospholipid
  bilayer.
• There are other molecules embedded in the
  membrane.

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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane is made of a phospholipid
  bilayer.
• There are other molecules embedded in the
  membrane.
• The fluid mosaic model describes the membrane.

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• Cell membranes are composed of two phospholipid
  layers.

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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane is selectively permeable.

Some molecules can cross the membrane while
others cannot.
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• Cell membranes are composed of two phospholipid
  layers.
• The cell membrane is selectively permeable.

Some molecules can cross the membrane while
others cannot.
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• Chemical signals are transmitted across the cell
  membrane.
• Receptors bind with ligands and change shape.
• There are two types of receptors.

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• Chemical signals are transmitted across the cell
  membrane.
• Receptors bind with ligands and change shape.
• There are two types of receptors.
• intracellular receptor

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• Chemical signals are transmitted across the cell
  membrane.
• Receptors bind with ligands and change shape.
• There are two types of receptors.
• intracellular receptor
• membrane receptor

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