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Journal #3 – Do Now
Sit in seats from Monday and pull out your science
notebook. Complete Journal #3 on your next blank
page. Answer the question in a complete sentence
and write out the hypothesis stem, completing the
sentence.
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What do you think happened to the gummy bear after sitting
in water overnight?
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Finish the hypothesis:
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If a gummy bear is submersed in water overnight, then the
gummy bear will…
+ Osmosis Lab (Day 2)
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With your partner, find your cup and carefully pour out the
remaining water in the cup into the sink
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Place your cup, with the bear inside, on the scale and record the
weight. Place the empty cup sitting next to the scale on the scale
and record the weight of the empty cup.
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Calculate the weight of the bear:
(Weight of Bear in cup) – (Weight of empty cup) = Weight of bear
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Draw a picture of the bear in the second dotted box on the handout
sheet. Draw arrows to indicate where you think the water went.
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Once your observations have been made, take your cup back to the
lab table and set your cup in your designated class period space.
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You will finish the lab on Friday and learn about how water moves
through cells.
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Cell
Differentiation
Previous Class…
Intro to Cells and
Osmosis Lab (Day 1)
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Cell Differentiation
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Look into the micro-viewer
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Write down 3 words that describe what you see on the same
page you wrote Journal #3
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Shape
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Size
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Color
+ All cells of an organism contain the
same DNA
Embryonic Stem
Cells
DNA
Nerve Cells
Voluntary
Muscle
Cells
Red Blood
Cells
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If our cells contain the same DNA,
why do we look like humans and
not a 100 trillion cell blob?
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…because our cells are differentiated.
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During Differentiation, a cell
becomes specialized.
When a cell is specialized only
certain fragments of DNA are
expressed.
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All differentiated cells develop
from stem cells, unspecialized
cells found in both the early stages
of development and in the adult
body.
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“Do I have to declare a major? Couldn’t
I just be a stem cell?”
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The human embryo
forms into a blastocyst
after four days of
development.
Cells that
can develop
into any cell
type are
called
pluripotent.
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Embryonic
Stem Cells
Adult
Stem Cells
Cells that can
develop into
any cell type
are called
pluripotent.
Cells that are limited
to replacing cells in
the tissues where
they are found are
called multipotent.
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A possible future treatment for
heart disease?
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Stem cells may make it possible to
develop a new field of
regenerative medicine.
Undifferentiated cells are used to
repair or replace damaged cells
and tissues.
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Cells of Your Body

Complete the worksheet

Read and follow the directions for each slide
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The text folder will help you fill in the information on the
worksheet
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This worksheet will be collected at the end of class.