The Nucleus

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The Nucleus

• Do Now
• Take out last nights homework

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The nucleus is a small sphere that holds all of a
cells DNA.
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Structure Function

• Structure spherical lipid membrane (like cell
  membrane)
• Function Stores DNA, controls cell activity

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It is found ONLY in EUKARYOTIC cells.
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Dolly the Sheep
Dolly was the first clone of an adult mammal ever
made. Dolly was born in 1997, she died a few
years later, younger than usual for a sheep. So
what does a cloned sheep have to do with a cell
nucleus?
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When adult animals are cloned, it is by adding a
nucleus from a cell to a new egg cell without a
nucleus.
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How to Make a Sheep.
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The nucleus is surrounded by a lipid membrane
called the nuclear envelope, which is very
similar to the cell membrane. It has openings
called nuclear pores that allow things in and out
of the nucleus.
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Most of the inside of a nucleus is made up of
chromatin, which is a mix of DNA and certain
proteins.
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The nucleolus is a small dark part inside a
nucleus where ribosomes are made.
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Find those parts Nuclear Envelope Nuclear
Pores Chromatin Nucleolus
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Homework read all about it!

• Nucleus p. 81 , SR 3 p. 83

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Cell City!

• You will be constructing a project during this
  unit.
• You will construct a city that is an analogy to a
  cell.
• Each part of the city should have a similar
  function to one of the cell parts we study.
• You will get more information soon, but start
  thinking what part of a city is a cell membrane
  like? A nucleus?