Cells Cells Are they by ewghwehws

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									 Cells
Are they alive or not???
              Cells
 The cell is the
  most basic unit of
  life.
 There are many
  different types of
  cells.
 Can you name
  some examples of
  cells?
Cells    The cell is the
          smallest unit of life in
          our bodies.
         In the body, there are
          brain cells, skin cells,
          liver cells, stomach
          cells, and the list
          goes on.
         All of these cells
          have unique
          functions and
          features.
Cells
         Skin cells are one
          example of cells
         Skin cells are
          actually dead
         So why do we put
          lotion and/or
          make-up on dead
          cells?
2 Types of Cells

  Prokaryotes            Eukaryotes
    Do not have a          Have a nucleus
     nucleus, instead
     they have free
     floating DNA           Have organelles
    Very small              (parts)
    Do not have
     organelles except      Larger cells
     for ribosomes
Prokaryotes

  They are 3-4 billion years old
  Made of only one cell- Unicellular
Prokaryotes
What is a Cell Membrane
     and Cell Wall
 A cell membrane protects the cell from
  outside invaders. It surrounds the cell
  not allowing anything unwanted in and
  helps to keep the organelles inside the
  cell.

 The cell wall surrounds the membrane.
 What is Cytoplasm and
      Ribosomes
 It’s the jelly like substance that is within
  the cell, surrounding and protecting the
  organelles.

 Ribosomes make proteins within the cell.
          What is DNA?

 DNA stands for Deoxyribonucleic acid.

 It holds all the genetic information within
  the cell.

 You could say it is the brain of the cell!
What is cilia or a flagella?

 These are both movement parts that the
  cell uses to move from place to place.
 This process of movement is known as
  locomotion.
 Cilia is found around a cell and beats
  continously.
 A flagella is a whip-like structure.
  Types of Prokaryotes

 Bacteria
 Viruses
 Protozoans
How Big are Prokaryotes?




  1 micron, it would take millions of cells to see
   prokaryotes with the naked eye.
   How do Prokaryotes
        divide?
 One Prokaryote splits into which creates
  2 prokaryotes. These 2 prokaryotes both
  split creating 4 Prokaryotes. This
  process continues and within minutes
  you could potentially have thousands to
  millions of cells!
Bacteria

            Most people think
             bacteria only causes
             colds, the flu,
             diseases, etc.
            Actually there are
             many bacteria that
             are very good for us!
            Can you name one?
Bacteria

  Bacteria can be found EVERYWHERE!
  Bacteria helps the Ecosystem by cycling
   nutrients
  Bacteria helps in decomposition of
   organisms.
  Bacteria has many different shapes!
There are a variety of
       Shapes
Eukaryotes

								
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