Download Cell Transport Notes

Cell Transport
Name _________________________________________________________ Pd _________ Date __________
Selectively Permeable Membrane
______________________________ –
a membrane that allows some molecules to pass
through but not others
Example:
Passive Transport
______________________________ Active Transport
______________________________ -
materials pass through a cell membrane without
using energy.
materials need energy to pass through a cell
Membrane
many
Diffusion – movement of molecules from an area where there are __________ to an area
few
where there are __________

equilibrium
Diffusion continues to happen until ____________________ is reached.
evenly or equally
Equilibrium – when molecules of a substance are spread ____________________ throughout
an area
Osmosis -
passive
water
_______________ transport of _______________ through a selectively
diffusion
permeable membrane by _______________

Some molecules are too large to enter a cell by using passive transport so they
must use active transport to enter the cell.
protein carrier molecule
Glucose needs a ______________________________ to enter a cell.

energy
active
This is a type of _______________ transport because it uses ______________
low
high
Diffusion works by sending molecules from _______________ to _______________ levels
low
At times cells must work opposite of diffusion and send molecules from _______________ to
high
_______________ levels.

energy
active
This requires _______________ so it is a form of _______________ transport
Sometimes very large molecules use a specific type of active transport.
endocytosis
_________________________ - a large molecule enters the cell enclosed in a membrane.
exocytosis
_________________________ - a large molecule exits the cell enclosed in a membrane.
Draw an arrow to show which direction the molecules would move under normal conditions.
The diagram above is an example of what type of cellular transport?
Cell Transport - Egg Lab
Egg
Short Circumference
(To the nearest tenth
of a cm)
Long Circumference
(To the nearest tenth
of a cm)
Detailed Observations
Egg with Shell
Egg with No Shell
Egg in Corn Syrup
Egg in Water
Conclusion Questions:
1.
In terms of water movement, explain and draw what happened to the egg after it was
soaked in corn syrup for 24 hours.
2.
In terms of water movement, explain and draw what happened to the egg after it was
soaked in water for 24 hours.
Cell Transport – Potato Lab
Color
Flexibility
Detailed Observations
Control Potato
Potato in Salt Water
Potato in Water
1.
In terms of water movement, explain and draw what happened to the flexibility of the
potato in salt water.
2.
In terms of water movement, explain and draw what happened to the flexibility of the
potato in fresh water.
Do cells have mouths?
Cell Transport – The Candy Problem
How do you think large particles get into cells?
Which cell organelle could be like a mouth?
Materials: (Per Group)
1 plastic shopping bag, 1 pair of scissors, 2 twist ties, 1 piece of candy per student
The Problem:
You must get the candy into the bag according to the following rules. Once you have completed
this task accurately show the final product to your teacher.
Rules:
 The candy must enter through a solid part of the bag
 The inside of the bag may not be directly open to the external environment at any
time.
 The candies entering the bag must remain clustered together
 At the end the candies will be clustered together and completely separate from
the bag.
 Students may work with their hands in the top of the bag to act as the inside of a
cell
 You may eat the candy only once I have approved your process
1. What process does this imitate in a cell?
2. Would this work in reverse? What would that be called?