Questions:
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If you did not finish the
vocabulary or the foldable
from yesterday, finish that
within the first 5 minutes!
What is a cell?
What is the difference between Prokaryotic & Eukaryotic cells?
Vocabulary: Continue today’s vocabulary on the “Cells”
page. Define the following terms on that page:
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Cell wall
Cytoskeleton (top of pg. 58)
ribosome
You may use Chapter 2,
Endoplasmic reticulum
section 2, the index, or the
Mitochondrion
glossary to define the
words.
Golgi complex
Lysosome
Robert Hooke was the first person to describe cells.
In 1665, he built a microscope to look at tiny
objects. He named the little boxes he saw when
looking at cork, cells.
 In 1673, Anton van Leeuwenhoek made his own
microscope. He observed pond scum and animal
blood. First person to see bacteria.
 Cell Theory:
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 All organisms are made of one or more cells.
 The cell is the basic unit of all living things.
 All cells come from existing cells.
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Most cells are too small to be seen without a
microscope, but some are big.
The yolk of a chicken egg is one big cell.
Most cells are small b/c cells take in food and
get rid of wastes through their outer surface.
The area of a cell’s surface limits its size.
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Cell membrane is a protective layer that covers the
cells’ surface and acts as a barrier. It controls materials
going into and out of the cell.
Cytoplasm is the fluid inside of the cell that holds all of
its parts.
Organelles are structures that perform specific
functions within the cell.
DNA (deoxyribonucleic acid) is the genetic material
that carries information needed to make new cells and
new organisms. Controls the activities of the cell.
Nucleus contains DNA and plays a role in cell growth
and reproduction- control center.
PROKARYOTIC
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Cells with NO nucleus.
Single-celled organisms
Bacteria is the smallest
cells known; no nucleus,
but does have DNA
EUKARYOTIC
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Archaea is a single-celled
organism with no nucleus
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 3 types: heat-loving, salt-
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loving, & methane loving
Cells with a nucleus
Largest cells
10x larger than most bacteria
All living things that are not
bacteria or archaea are made
up of one or more eukaryotic
cells
Most are multicellular (many
cells)
Multicellular organisms are
larger than single-celled
Animals & plants