CELLS

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CELLS
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What is a Cell?

• Cells are small compartments that hold all of the
  biological equipment necessary to keep an
  organism alive and successful on Earth.

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Types of Cells

• Eukaryotic
• Cells with a nucleus.
• Animal and Plant
• Prokaryotic
• Cells without a nucleus.
• Bacteria

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An Overview of Cells

• All living things are made of cells.
• Cells are the basic units of structure and
  function in living things.
• Cells form the parts of an organism and carry out
  all of an organisms processes, or functions.

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Cell Structure

• All living organisms on Earth are divided in
  pieces called cells.
• The structures of living things are determined by
  the variety of ways in which cells are put
  together.
• There are smaller pieces to cells that include
  proteins and organelles.
• There are also larger pieces called tissues and
  systems.

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Cell Function

• An organisms functions are the processes that
  enable it to stay alive and reproduce.
• obtaining oxygen
• getting rid of wastes
• obtaining food
• growing
• A main purpose of a cell is to organize.
• Cells hold a variety of pieces and each cell has
  a different set of functions.

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Cell Size

• The invention of the microscope made it possible
  for people to discover and learn about cells.
• Unicellular made up of a single cell.
• bacteria protists
• Multicellular made up of two or more cells.
• fungi, plants and animals

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Multicellular Organisms

• When multicellular organisms grow in size, it is
  because their cells multiply in number.
• When cells reach a certain size, they will go
  through the process of cell division (mitosis).

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Animal Cells

• Animal cells are the cells found in animals.
• You are made up of trillions of animal cells.
• An animal cell is a very complicated system.
• Animal cells have three main parts cell
  membrane, cytoplasm and nucleus.
• Animal cells have many organelles that carry out
  life processes.

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Plant Cells

• Plant cells are cells that are in plants.
• Plant cells are like animal cells, but they have
  a cell wall and chloroplasts.
• A very special process that takes place inside of
  the chloroplasts in plant cells is called
  photosynthesis.

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Bacterial Cells

• Prokaryotes
• lacking well-defined nuclei and membrane-bound
  organelles
• They come in many shapes and sizes.
• spheres, cylinders, spiral threads, flagellated
  rods, and chains
• They are found practically everywhere on Earth
  and live in some of the most unusual and
  seemingly inhospitable places.
• They are essential to human life and life on
  planet Earth.
• Although they are notorious for their role in
  causing human diseases, from tooth decay to the
  Black Plague, there are beneficial species that
  are essential to good health.

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Common Cell Structure

• Cell Membrane
• Works like a screen.
• It lets the good things in like nutrients and
  lets the bad things out like waste.
• Cytoplasm
• The jelly-like part of the cell where the action
  takes place.
• It is where the nutrients are used.
• Nucleus/DNA
• The brain of the cell.