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