Bell Ringer (eggs up front) Observe what happened to the eggs. Did you expect this to happen? Think...
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Transcript of Bell Ringer (eggs up front) Observe what happened to the eggs. Did you expect this to happen? Think...
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Bell Ringer (eggs up front)Observe what happened to the eggs.
Did you expect this to happen?Think about it in terms of fluid
movement.
![Page 2: Bell Ringer (eggs up front) Observe what happened to the eggs. Did you expect this to happen? Think about it in terms of fluid movement.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649da65503460f94a92598/html5/thumbnails/2.jpg)
Plasma Membrane: Structure
http://trixyofassisi.blogspot.con/2012/01/plasma-membranes.html
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Lesson OverviewShort VideoGroup ExplorationBrief LectureMembrane ModelingReview
http://youtu.be/Qqsf_UJcfBc
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Think, Pair, ShareRead the brochure on the plasma
membrane with the person next to you.
Take note of several key components
of the membrane.
Discuss and decide on a favorite destination with your neighbor. We will share in a moment.
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Fluid Mosaic ModelCell Membrane is a mosaic
Proteins and other molecules are embedded in a framework
Cell Membrane is fluidMost protein and phospholipid molecules can move laterally
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Membrane Structure
Phospholipids are the major structural component of membranes.
Phospholipid
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Membrane StructureAll membranes are phospholipid bilayers
with embedded proteins.
Hydrophilic heads
Hydrophobic tails
Phospholipid Bilayer
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Glycoproteins & Glycolipids Have short chain carbohydrates
attached on the outer side of the membrane.
Cell-cell recognition - identify type of cell and identify a cell as “self” vs. foreign
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Membrane Proteins:integral proteins – embedded in the
membrane Peripheral proteins – not embeddedExamples:
channels and carriersenzymesreceptor proteins
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Transport Proteins Passive Transport
Allows substances to cross the membrane by diffusionDiffusion - movement from high concentration to low concentration
no energy required
Active Transport Requires energy (ATP) to transport
substances against their concentration gradient
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LE 7-17
Diffusion Facilitated diffusion
Passive transport
ATP
Active transport
Active Transport
Channel Carrier
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More about Active Transport
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Vesicle forming
Endocytosis
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EndocytosisCell membrane sinks inward, pinches off and forms a vesicle
Brings material into the cell
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Endocytosis - termsPhagocytosis – cell eating
Brings in solid particlesExamples: bacteria, cell debris, or food
Pinocytosis – cell drinkingCell brings in a liquid
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Vesicle
Fluid outside cell
Protein
Cytoplasm
ExocytosisMovement of large molecules
out of the cell.
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BE the Plasma MembraneUse your amazing
interpretive dance skills to BE the membrane.
The entire class will BE the membrane and model what a fellow classmate (the director) dictates. Hint: Hydrophobic arms
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Fig. 5-1a
Cholesterol
Glycoprotein
Glycolipid
Carbohydrate ofglycoprotein
Phospholipid
Microfilamentsof cytoskeleton
Protein
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Murky and Main PointsWrite 3 main points from today’s lesson.
Must be content-based. Ex: The plasma membrane is selectively
permeable to control what is allowed in and out of the cell.
Write 1 or more murky points from today’s lesson. This is material that is unclear to you.
Write 1 favorite point from today’s lesson. What did you enjoy about class today?
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ProblemWhy is the structure of the plasma membrane beneficial for:The Environment Functions of the cell
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ReviewThe plasma membrane is made of a
phospholipid _______.The phospholipids have a hydrophilic
______ and two hydrophobic _____.When ___________ is present in the
cell membrane, its presence stabilizes the membrane and hinders packing at cold temperatures.
head
bilayer
tails
cholesterol
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ReviewProteins that penetrate the bilayer are
called _________ proteins. Many of these are _______________
proteins, because they completely span the membrane.
___________ proteins are not embedded in the lipid bilayer.
When carbohydrates covalently bond to proteins they are called _____________, which play a role in cell-cell recognition.
Peripheral
integral
transmembrane
glycoproteins
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Review________ proteins allow hydrophilic
molecules to quickly pass from one side of the membrane to the other.
_______ proteins alternate between two conformations for molecules to be transported.
Channel
Carrier