Q1
 Does
passive transport require energy?
 NO
1
Q2
 What
is the second type of transport?
 Active
2
Q3
 What
allows solutes to pass through a
membrane?
 Proteins
3
What is the difference between
diffusion and osmosis?
 Diffusion
is from a high concentration to
low concentration and osmosis is the
movement of water
4
5
Gummy Bear Osmosis
 They
were each in a different solution,
one with only water and one with salt
water
6
Salt Water
Gummy
Bear in salt water: A cell’s cytoplasm
is composed of a great amount of water.
There is a greater percentage of water inside
of cells than in the salt water surrounding the
cells. This unequal amount of water inside and
outside of the cell creates a concentration
gradient. The cell wants to be in balance with
its environment, so water will leave the cell.
Water will leave rather than salt
7
Tap Water
 Gummy
Bears in plain water: The cell is not only
made up of water, there are also salts, sugars and
proteins. Because there is only water in the
beaker, there is a greater water concentration in the
beaker than the cells of the gummy bear. This
creates a concentration gradient, and to reach a
balance, water enters the cells. As stated
previously, water moves because it can freely pass
through the cell membrane. The other molecules
are too large.
8
Which one was hypotonic?
Hypertonic? Why?
9
TOMORROW
 We
are moving on to talking about Active
Transport
10
Reminder about Cell
Membranes:
 What
is a cell membrane?
 Phospholipids
 Hydrophilic
Head
 Hydrophobic Tail
11
Active Transport
Requires energy from the cell
 Movement of particles from low
concentration to high concentration

Goes “uphill”
 Type 1: Pumps
 Particle binds to a transport protein
 Protein changes shape which requires
energy
 Releases particle inside the cell
 Protein returns to original shape

The
SodiumPotassium
Pump
13
Active Transport, cont.
 Movement
of large particles, using
membrane movement/reconfiguration
 Type 2: Endocytosis
 Movement
of large particles INTO the cell
Cell surrounds and takes in material from its
environment
 Often used for nutrients or foreign invaders

 Type
3: Exocytosis
 Movement
of large particles OUT of the cell
Reverse process of endocytosis
 Used to expel wastes and secrete substances
produced by the cell

Endocytosis
Exocytosis
Endocytosis & Exocytosis
 http://www.youtube.com/watch?v=4gLtk8
Yc1Zc
16
Basic types of transport
17
Membrane Transport
Animation
 And
once again, so you understand what
she’s talking about…

18
Vocab Terms
Passive
Transport
Active
Transport
Diffusion
Equilibrium
Facilitated
Diffusion
Osmosis
Hypertonic
Isotonic
Hypotonic
Endocytosis
Exocytosis
19
Super Science Songs
 Cell
Song
 Gotta Get That, ATP
20
Your assignment:
 Create
a song using the information from
this unit about cell organelles and cell
transport
 You
can use a song that you already know
and alter the lyrics, or create a completely
new song
 Complete lyrics will be due at the end of the
period on Friday
 If you want to create a music video, you will
receive extra credit, they will be due next
Wednesday (12/19)
21
Requirements
 School
appropriate lyrics
 Include at least 10 vocabulary words
 It needs to make sense when
read/spoken
 At least three verses and a chorus that
repeats
22