Download WHAT IS THE CELL MEMBRANE?

WARM-UP
1. Why do you think plant cells have a square-like
shape?
2. What organelle is the “brain” or the cell that
contains all the genetic information?
3. What does a eukaryotic cell have that a
prokaryotic cell does not?
4. What are at least 2 things a virus CANNOT do?
5. What does the mitochondria do?
COMPARING CELLS LAB
• Reminder: If you did not take the quiz on Friday, you need
to come in during lunch or after school BY THE END OF
THIS WEEK. You can use your foldable.
• Progress Reports are due this week. I will hand out
sheets that include what assignments you are missing. Turn
in your missing assignments as soon as possible. If you were
not here for a lab, test, or quiz you must come in during
lunch, after school or advisory to complete them.
COMPARING CELLS LAB
• Objective: SWBAT set-up wet slides of different types of
cells and record their observations
• Agenda
• Go over parts of a microscope and fill in handout
• Model how to make a wet mount slide and lab directions
• Complete Lab and Lab handout
• Discuss results
• Start Cellular Transport Notes/ Work on Homework
MAKING A WET MOUNT SLIDE
1. Get a clean __________ and ______________ from
your teacher.
2. Be careful with ____________________ because it
can stain your clothing or irritate your skin.
3. Place _____ drops of water in the middle of the slide.
If there is too much water, the coverslip will not hold
the cells in place.
4. Place one _______ of the coverslip just outside the
water on the slide.
5. Slowly _____________ the coverslip on top of the
water.
MAKING A WET MOUNT SLIDE
6. Pick up the slide with ________ _________. Place
the slide on the ___________ and view it first with the
________ objective. Once you see a general image of
the cells, you can rotate the _______________ to
view the slide with different objectives.
7. When you’re done viewing one slide, carefully take it
off the _________ with ________ __________.
8. After viewing all of the slides, clean off both the
________________ and _________ with water and
________ them down with paper towels.
EXIT TICKET
1. What cell structures were you able to
observe today?
2. Were these cells prokaryotic or eukaryotic?
3. What do plant cells look like compared to
animal cells?
WARM UP
1. What cell structures were you able to observe
yesterday? Use your foldable to answer.
2. Why do animal cells NOT have a chloroplast?
Answer in complete sentences.
3. Which structure of the cell provides protection and
controls what goes in or out of the cell?
4. What kinds of materials do you think pass through
a cell? Name at least 3.
AGENDA
• Reminder: You may come in to do a Quiz retake during nutrition
break, lunch, after school or advisory. I cannot go over the
quizzes from last week until everyone takes it.
• Objectives:
• SWBAT describe the function of the cell membrane and
define selectively permeable.
• SWBAT classify scenarios as either active or passive
transport and provide an explanation.
• Notes
• Group demonstration
• Exit Ticket
• Homework: Reading Guide 3.3 and Cross Word Puzzle
WHAT IS THE CELL MEMBRANE?
• The Cell membrane is a boundary between the
cell and its environment.
• It allows materials such as water, nutrients
and waste products to enter and leave.
• Often called a selectively or semi permeable
because it only allows certain materials in and
out
SEMI-PERMEABLE
MOSAIC
WHAT IS THE CELL MEMBRANE MADE
OF?
• The cell membrane is mostly made of a lipid
bilayer
- Lipids are typically fats, oils and waxes
- Bi = two
•
The “heads” are polar and will interact with
water
•
The “tails” do not interact with water and face
each other
•
Proteins and Carbohydrates are also
embedded in the membrane.
CELL MEMBRANE
Hydrophobic- does not like water
Hydrophilic- likes water
CELL MEMBRANE
THE CELL MEMBRANE
• The Cell Membrane’s main function is to
maintain homeostasis. So, what is
homeostasis…
HOMEOSTASIS
• Homeostasis is when a living thing
maintains its internal environment.
i. All livings things must be able to maintain
their internal environment
• Examples:
• Sweating cools our skin
• Shivering generates heat
THE CELL MEMBRANE
WHAT IS CONCENTRATION?
• Concentration is the amount
of a substance (mass)
present in a given volume of
a solution
• Concentration gradient: is
the difference in
concentration of a
substance from one
location to another
GROUP DEMONSTRATION
GROUP DEMONSTRATION
CELLULAR TRANSPORT
•
Definition: The movement of molecules,
energy and waste in or out of the cell.
•
The ONLY way to get in or out is through the CELL
MEMBRANE.
•
The Cell membrane is SEMI-PERMEABLE, meaning
that some things are allowed through and others
aren’t to maintain homeostasis
•
There are TWO types of transport:
•
Active transport
•
Passive transport
PASSIVE TRANSPORT
•
Definition: The movement of substances
across a biological membrane without
spending chemical energy (ATP).
•
Types of Passive Transport:
• Diffusion
• Osmosis
DIFFUSION:
•
Definition: a natural process of molecules
moving from areas of HIGH concentration
to areas of LOW concentration.
•
Key things to keep in mind:
•
Does NOT require spending any ATP.
•
Always moves from where there is
MORE to where there is LESS.
DIFFUSION:
Semi-permeable membrane
OSMOSIS:
•
Definition: Osmosis is the diffusion of
water only.
•
Things to keep in mind:
•
Osmosis is the exact same thing as
diffusion…only it only deals with water.
•
No energy needs to be spent.
•
Water always moves from where there is
MORE to where there is LESS.
1. Which side in the picture below has the greatest
concentration of sugar? Water?
2. In which direction will the water move?
•
Osmosis cont.
There are three different types of
solutions…
1. Isotonic
• Means “same strength” or same concentration
2. Hypertonic
• Means “above strength” or high concentration
3. Hypotonic
• Means “below strength” or low concentration
TYPES OF SOLUTIONS
IDENTIFY THE TYPE OF SOLUTION
A
B
C
WARM-UP
1. Fill in the blanks: _________________ is a type of
_________ _______________ that only involves
the movement of water across a cell membrane
2. Through cellular transport, what is the cell trying to
achieve?
3. Movement of carbon dioxide molecules through a
cell membrane from a HIGH to LOW concentration
requires no energy. This is an example of….
4. What form of energy do cells use?
• Objectives:
AGENDA
• SWBAT differentiate between passive and active transport.
• SWBAT set up a transport lab using iodine, starch, and test
tubes by following directions and safety requirements.
• Finish Cellular Transport Notes
• Lab
• Go over handout
• Set-up
• Complete Day 1 questions
• Exit Ticket
• Homework: Study Guide/ Reading Guide 3.4-3.5
ACTIVE TRANSPORT:
•
Definition: the process that requires energy
in the form of ATP to move molecules
across a membrane.
•
Two IMPORTANT things to know about active
transport:
•
ENERGY IS Needed in the form of ATP
•
Molecules are moved from areas of LOW
concentration to areas of HIGH
concentration.
TYPES OF ACTIVE TRANSPORT:
•
There are THREE main types:
• Endocytosis:
ENDO means internal or inside
•
Exocytosis:
EXO means external or outside
•
Transport Protein Pumps:
a. A pump is a machine that requires energy to move
materials in or out
b. Ex. Air pumps for tires and sports balls
TYPES OF ACTIVE TRANSPORT:
1. Endocytosis: process of engulfing LARGE
molecules and bringing them INTO the cell.
2. Exocytosis: process of enveloping LARGE
molecules and releasing them OUT of the
cell.
3. Transport Protein Pump: a protein that is
within the cell membrane that can open and
close to shuttle molecules in or out of the cell
against the concentration gradient.
WHICH TYPE IS THIS?
CELLULAR TRANSPORT CONCEPT
MAP
EXIT TICKET
1. A cell requires energy to move materials from an area of
low concentration, across the cell membrane, to an area
of high concentration. This process is called:
2. A lipid bilayer makes up the majority of which structure?
a. Cell Wall
b. Cell Membrane
c. Cytoplasm
d. Chloroplast
3. What does semi-permeable mean?
4. Sodium ions are pumped from a region of low
concentration to an area of high concentration in the
nerve cells of humans. What is this process called?
WARM-UP
1. What does semi-permeable mean?
2. Starch molecules are pumped into a cell through proteins in
the cell membrane. Energy is required. What type of
transport is this?
3. Which type of transport occurred in the diagram below?
AGENDA
• Reminder: Pablo, Miriam, Precilla and Alex—
You need to take the quiz! Anyone who wants to
retake the quiz to get a better score must do so
by Friday. All missed or late work must be turned
in by Friday as well.
• Objective: SWBAT draw a conclusion about the
permeability of a plastic bag and determine the
type of transport that occurred.
• Finish Lab
• Complete the Lab handout
• Clean-up supplies
• Study Guide for Test
TYPES OF CELLS
_____________________
_____________________
“before a nucleus”
Does NOT have a
nucleus or most
organelles. Has
cytoplasm, DNA,, cell
membrane
“true nucleus”
Has a nucleus with DNA,
organelles, cell membrane,
cytoplasm
Plant Cell
___________
Ex.: _________________
1. __________
2. __________
3. __________
Cell Membrane,
ribosomes,
nucleus, ER,
Golgi
apparatus,
mitochondria,
cytoplasm
Small
Vacuoles,
circular
shape
EXIT TICKET
1. Sodium ions are pumped from a region of low
concentration to an area of high concentration
in the nerve cells of humans. What is this
process called?
2. Plant and Animal cells are both types of
___________________ cells.
3. How do we know if a cell is prokayotic?
4. What is it called when a living thing, or cell, tries
to maintain internal balance?
WARM-UP
The diagram shows a cell placed
in a solution.
1. How will osmosis affect the
animal cell?
a. Water will enter the cell
causing it to enlarge.
b. Water will leave the cell
causing it to shrink.
c. Sugar will enter the cell
causing it to enlarge.
d. Sugar will leave the cell
causing it to shrink.
AGENDA
• Study for Test
• Vocabulary Memory Game
• Ask any remaining questions
• Turn in Study Guides and any missed or late
work.
• Take Test
• Planet Earth Video (If we have time!)