Welcome to Unit 2: Structure & Function Write down homework 1)Bring in materials for membrane model!...
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Transcript of Welcome to Unit 2: Structure & Function Write down homework 1)Bring in materials for membrane model!...
Welcome to Unit 2: Structure & Function
• Write down homework1) Bring in materials for membrane model!
2) Homework & Quiz on Friday
- worksheet?
- questions?
- vocab story?
• Check out your bacterial plates! Who had the most? Are you surprised?
How does bacteria infect your cell?
What do you remember?Use the cut-outs to label the function of
each membrane component
You’re Building your Model Today! Get out your White Sheet
HMWK: option due: worksheet? Text outline + questions? Quiz on cell membrane tomorrow Model is DUE tomorrow!
10/20: let’s get organized1) Get out your yellow packet
Write your name on it!
2) Write down you homework
HMWK: option due on Thursday or Friday Quiz on transport on the block (R or F)
Cell Boundaries
Every cell is surrounded by a liquid environment and has a liquid inside
Two types of boundaries separate:
– Cell membrane (inner)• Thin, flexible layer that surrounds all cells
– Cell wall (outer)• Strong supporting layer outside the cell membrane• Only in some organisms (plants, algae, fungi, prokaryotes)• Porous
FUNCTION of Cell Membrane
• Regulates what goes in and
what comes out of a cell– Like a fence or a window screen– Regulation depends on size, concentrations,
and the type of molecule trying to get through
• Protects cell
• Supports cell, but also flexible
https://www.youtube.com/watch?v=HqKlLm2MjkI(4:02) osmosis rap
• https://www.youtube.com/watch?v=XKPdnE6BGew• How to make an onion slide
Outsideof cell
Insideof cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel Lipid bilayer
Carbohydratechains
Section 7-3
Figure 7-12 The Structure of the Cell Membrane
http://www.youtube.com/watch?v=ULR79TiUj80
Pre-Class QuestionsWrite in Notebook…I will call on you!
• Why is it necessary to regulate what goes in and out of a cell?
• What are some examples of substances that enter a cell? Leave a cell?
• What does the term concentration mean?– Provide an example to explain concentration
FUNCTION of Cell Membrane
• Regulates what goes in and
what comes out of a cell– Regulation depends on size, – concentrations, – type of molecule trying to get through
• Protects cell
• Supports cell, but also flexible
Cell Boundaries
Everything has a Cell membrane (inner)
Some stuff has a Cell wall (outer)
• Strong & rigid• Only in some organisms (plants, algae, fungi, prokaryotes)
Inside of cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel
Lipid bilayer
Carbohydratechains
Section 7-3
Figure 7-12 The Structure of the Cell Membrane
Fluid Mosaic Model• Lipid bilayer – double layer of molecules
– Lipids are a certain class of C-H molecules – Do not like water ( think of oil + water) – the “tails”– The “heads” are polar molecules
• Has proteins throughout • Can have carbohydrate “ID tags”• Moveable/fluid• Selectively Permeable
Inside of cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel
Lipid bilayer
Carbohydratechains
Section 7-3
Figure 7-12 The Structure of the Cell Membrane
Fluid Mosaic Model• Lipid bilayer – double layer of molecules
– Lipids are a certain class of C-H molecules
– HYDROPHOBIC:• Do not like water ( think of oil + water) – the “tails”
– HYDROPHILIC:• The “heads” are polar molecules
• Selectively Permeable
What goes in and out? (Transport)Cell membrane is selectively permeable,
it lets some things in, but not other things
Selection depends on…
size (smaller get through easily)
concentrations,
& type of molecule trying to get through
(lipid and nonpolar)
https://www.youtube.com/watch?v=IaZ8MtF3C6M• Substances keep moving till there are ~ equal
amounts of them on both sides of the membrane EQUILIBRIUM
Go to Page 10 in yellow packet
Draw this graphic organizer, then use the word bank
p10 of your yellow packet will help!!!
• Active Transport • Diffusion• Passive Transport• Exocytosis• Protein Pumps• Facilitated Diffusion• Endocytosis• Osmosis
Check your answers; get out the white study guide
https://www.youtube.com/watch?v=HqKlLm2MjkI(4:02) osmosis rap
https://www.youtube.com/watch?v=yz7EHJFDEJs Na-K pumphttps://www.youtube.com/watch?v=DuDmvlbpjHQEndo exo cytosis
Passive Transport [High] to [Low]
• DIFFUSION • OSMOSIS• FACILITATED
DIFFUSION
Hypertonic – has a lot of soluteHypotonic – has low soluteIsotonic – has equal solute
Osmotic Pressure
Will the solutions ever be isotonic?
What forces are at
play on the egg?
10/27: Find your lab from last week! Let’s review Transport
Make sure you have both sides filled in – except for the final results obviously!
Review Quiz
Permeabilityhttp://www.youtube.com/watch?v=GW0lqf4Fqpg&feature=related
(1:23)
Do these get through?• H+ or Ca++• CO2
• K+, Cl- • H2O• Glycerol or ethanol (-OH)• O2
• Amino acids• Glucose
https://www.youtube.com/watch?v=owEgqrq51zY(1:26 – review plasma membrane structure)
https://www.youtube.com/watch?v=6R2-AFcJrhs Sodium potassium pump
What do you remember about the cell?
• https://www.youtube.com/watch?v=rABKB5aS2Zg (3:09)
• With your table group – make a list of all of the organelles you can remember
• List their functions too!
• https://www.youtube.com/watch?v=wJyUtbn0O5Y
Do Now: Cell Review
• Skim pages 3, 4, 5 in your yellow packet
• Read & Complete page 3 questions as you go!
What do you remember?Find in your notebook, that chart you made last week of
prokaryote v eukaryote
https://www.youtube.com/watch?v=ruBAHiij4EAPg 6 chart
What do you remember?Sort!
Sort the cards with your table group
• Put in 1 of 4 areas:
Pg 3
Prokaryote vs. EukaryoteAll cells have a membrane, cytoplasm, DNA & ribosomes
• Prokaryotic Cells
– DNA not bound by a membrane… no “true nucleus”
– Usually smaller, simple – No membrane bound
parts (organelles)– Ex: bacteria
• Eukaryotic Cells
– Membrane bound nucleus
– Larger, complex, internal organization
– Have internal membrane bound structures
– Ex: you, plants, algae
Cell membrane prokaryote Animal cells Plant cellsCell wall
Nucleus
Ribosomes
Endoplasmic reticulum
Mitochondria
Cytoskeleton
Chloroplasts
Golgi apparatus
Vacuoles
DNACytoplasmCentrioles
Nucleolus
Which Organelle is where?
Origin of Eukaryotic CellsEndosymbiotic Theory
A prokaryote ate a prokaryote!Mutualistic relationship
Mitochondria + Chloroplasts have outer & inner membranesBoth have their own DNA & their own ribosomes!
More similar to bacteria than euk’s
http://www.youtube.com/watch?v=RaAM8qQcs6E&feature=player_embedded (3:36)
Pg 4 answers
Mader: Biology 8th Ed.
Figure 28.4 A model of the origin of eukaryotes
This is how we’re reorganizing the protists – based on “who ate whom”. Endosymbiotic Theory Evidence:-Number of membranes of organelles-Presence of DNA in mitochondria-Structure of ribosomes
This Week’s Project!• Today – brainstorm
sheet
• Tomorrow – work day to make your profile
• Thursday: Cell Party!!
• Friday: quiz
This Week’s Project!
• Work today to make your profile
• Tomorrow: Can you find your perfect match?
• Friday: quiz
Speed Dating Organelles
• Today you will research a specific organelle and use the brainstorm planning sheet (two-sided) to construct a profile of your organelle
• Towards the end of the period, I will give you the ‘good copy’ to be used tomorrow.
• Tomorrow, we will have a ‘speed dating’ session and your job will be to meet everyone & decide which organelle(s) you’re most closely matched with
Organelle Speed Dating!
Goal: Find the organelle(s) that work most closely with your
organelle
Organelle Prok Euk□ Cytoplasm □ Cytoskeleton □ Nucleus □ Nucleolus □ Ribosome □ Smooth Endoplasmic
Reticulum
□ Rough Endoplasmic Reticulum
□ Golgi Body □ Vacuole □ Lysosome □ Mitochondria □ Chloroplast □ Cell Membrane □ Nuclear Membrane □ Centrioles □ DNA □ RNA □ Cell Wall □ □ □
Find a seat!
If you are seated in the inner circle,you’ll stay there for most of the activity
If you’re seated on the outside, each time I call “time”, you will rotate one seat to your right.
For 1:30 you will converse with your new Organelle friend Take turns sharing & explaining your job!
• Living things respond to environment
ex. Find shelter from rain
ex. Hibernating to survive the winter
ex. Produce toxins to ward off predators• Living things maintain a stable internal environment
– Homeostasis: keeping internal condition stable relative to the external environment
Characteristics of Living Things - Homeostasis
Sodium Potassium Pump