cell membrane

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HAPPY MONDAY!!
Bellwork:
Draw a representation of the picture
below. Use your drawing to explain
why it is important for cells to be
small.
SCIENCE FACT OF THE DAY:
A PILOBOLUS FUNGI SHOOTS ITS SPORES AT A
TOP SPEED OF 25 M/S. IT REACHES THESE SPEEDS
IN 2 MILLIONTHS OF A SECOND.
ACTIVITY:
 Open
your journals
 Set up page number __17__ for Cornell Notes
 Your first entry on the left hand side should be
“Observations”.
 You should all have a set of random objects at your
tables.
 For the next 10 minutes you will explore and record
as many observations as you can about the items at
your table. (CHAMP)
 Write down ANYTHING you observe.
 There are no right or wrong answers.
TODAY’S ESSENTIAL QUESTION
 What
is a membrane and what is it’s
purpose?
 What
did you observe in the activity and
how does it relate to the essential
question?
ALL CELLS ARE SURROUNDED BY A THIN,
FLEXIBLE BARRIER KNOWN AS A
CELL MEMBRANE.
WHAT IS THE CELL
MEMBRANE’S FUNCTION
(JOB)?
(2 THINGS)
1) TO REGULATE WHAT ENTERS AND
LEAVES THE CELL
2) TO PROVIDE PROTECTION AND
SUPPORT.
MEMBRANES FALL INTO THREE
CATEGORIES…
They can be permeable, meaning that the
membrane is penetrable and will allow liquids,
particles and gasses to pass through it.
 Which of the objects from the activity were
completely permeable?

They can be impermeable, meaning that the
membrane is not penetrable and will NOT allow
liquids, particles or gasses to pass through it.
 Which of the objects from the activity were completely
impermeable?

Finally, they can be Selectively permeable,
meaning that some substances can pass across
while others cannot.
 Biological membranes, like the ones around
your cells, are selectively permeable.
 Which of the objects from the activity were
selectively permeable?

WHAT IS THE CELL MEMBRANE MADE
(COMPOSED) OF?
(3 TYPES OF MOLECULES)
The
cell membrane is composed of a
double-layered sheet called a lipid
bilayer.
Bi- means 2
DRAW THIS!
Also called the
phospholipid
bilayer
PROTEINS ARE EMBEDDED IN THE
LIPID BILAYER.

Proteins form channels or pumps that help move
large materials across the cell membrane.
Carbohydrates
are attached to
many proteins embedded on the
outside of the bilayer.
The carbohydrates allow individual
cells to identify one another.
HOMEWORK

http://youtu.be/yF1J8l
jEZDw

Alyssa Dolny Molecule
Transport
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