Do Now: What do YOU think?

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Do Now What do YOU think?

• Complete the Cells Pre-assessment to the best
  of your ability.
• It will be graded on completeness, not accuracy,
  since it is a pre-assessment
• You have 8 minutes!

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Microscopes were first invented and used a little
over 300 years ago. (late 1600s) Robert Hooke
and Anton Van Leeuwenhoek were the first
scientists to study cells, with microscopes like
this one.
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This is where The term cell comes From.
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They were the first people to see a whole new
world of tiny organisms. Recognize this one?
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Microscopes have come a long way since
then! Advances in technology often cause
advances in science. Todays scientists can see
all sorts of things
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Cells are the smallest units of life

• CELL THEORY PART 1 Every organism is made of
  one or more cells.
• Cells are very small, and require a microscope to
  be seen individually.
• CELL THEORY PART 2 Cells are the smallest unit
  of life

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There are millions of cells just like this one in
your brain. Theyre called neurons.
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Everything in your body is made of cells, from
your liver (left) to your muscles (bottom)
Why do you think they look so different?
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Its not just you though look at all these
bacteria cells living in pond water!
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Theres practically no limit to the number of
different types of cells out there!
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All of these microscopic organisms are made of
cells too!
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Cells interact with each other just like other
organisms do whats going on here?
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Its a life or death struggle can you guess
what this is a picture of?
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In this unit you will

• Observe plant and animal cells to identify some
  of their internal parts.
• Learn what the different parts of a cell do and
  how they work together to keep a cell alive.
• Learn about the different types of cells on
  Earth.

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• Will this recipe for creating mice work? Why
  or why not?

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Spontaneous Generation?
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History

• Spontaneous Generation the false belief that
  living things arise from non-living material
  today.
• Was widely believed to be true until the 19th
  century

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Pasteur proved spontaneous generation was wrong!

• "Never will the doctrine of spontaneous
  generation recover from the mortal blow struck by
  this simple experiment." - Louis Pasteur
• The swan neck flask experiment is famous.
• CELL THEORY PART 3 Cells come only from
  preexisting cells.

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So Where did the first cells come from?

• Probably only possible in a lifeless world.
• Self-replicating RNA molecules enclosed within
  lipid bubbles is the leading idea
• Chemicals of life are easily produced by
  inorganic processes.

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How smalls a cell? About 1,000 times BIGGER
than moleculesAbout1,000 times smaller than you
can see with the naked eye
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There are two basic types of cells. Eukaryotic
cells are larger, more complex, and have a
nucleus. Humans, as well as all other animals
and plants are made of eukaryotic
cellsProkaryotic cells, like bacteria, are all
unicellular, small, and simple. They have no
nucleus.
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Remember that cell theory!

• 1. All living things have 1 or more cells.
• 2. Cells are the basic units of structure
  function in organisms.
• 3. Cells come only from preexisting cells.

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Exit Ticket

• Write the following on a scrap of paper before
  you leave
• 1. What type of cells have a nucleus?
• 2. What are the 3 parts of the cell theory?