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The functions of the organism are divided up among its parts (organs and organ systems). All the parts cooperate to carry out all the functions of the whole organism.
1. Some activities cannot be performed by only one person, but need a team of people. What type of activity requires a team of people to work together in order to complete a task?
Answers might include building a human pyramid or constructing an arch out of blocks.
2. What do you think are some characteristics of a successful team?
Divide up jobs and cooperate well with one another.
3. How is a multicellular organism similar to a successful team?
Chapter 7-2 & 7-3Cell Structure and
Function
Image from: © Pearson Education Inc, Publishing as Pearson Prentice Hall; All rights reserved
NucleolusNucleus
Nuclear envelope
Ribosome (attached)Ribosome (free)
Cell Membrane
Rough endoplasmic reticulum
Golgi apparatus
Mitochondrion
Smooth endoplasmicreticulum
Centrioles
Go to Section:
7–2 Cell StructureI. Animal cells
A. Cell MembraneB. NucleusC. CytoskeletonD. CentriolesE. MitochondriaF. Endoplasmic ReticulumG. RibosomesH. Golgi ApparatusF. Lysosomes
II. Plant cellsA. Cell wallB. VacuolesC. Chloroplasts
III. Bacteria
Section 7-2
Section Outline
Image from: http://www.biology4kids.com/files/cell_membrane.html
A CELL is . . . made of MOLECULES
_______ ___________ ___________ATOMS MOLECULES ORGANELLES
1. All living things are made of _____________.2. Cells are the basic unit of structure & function in an organism
(= basic unit of __________)3. New cells are produced from _________________ cells
CELL THEORY CELL SIZE
___________ cells > _________ cells > _____________
Cells
lifeexisting
PLANT ANIMAL BACTERIA
CELL MEMBRANE(also called plasma membrane)
Cell membranes are made mainly of ________________ & __________________ PHOSPHOLIPIDS PROTEINS
Outsideof cell
Insideof cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel Lipid bilayer
Carbohydratechains
Image from: © Pearson Education Inc, Publishing as Pearson Prentice Hall; All rights reserved
LIPID TAILS ARE HYDROPHOBIC
HYDROPHILIC
HYDROPHOBIC
Image by Riedell
Oil and water don’t mix!
Image from: http://employees.csbsju.edu/hjakubowski/classes/ch112/lipids/micbilayer.gif
PHOSPHOLIPID BILAYER
Image from: http://employees.csbsju.edu/hjakubowski/classes/ch112/lipids/micbilayer.gif
SEE HOW MEMBRANES FORM
CELL MEMBRANE
Proteins that stick on the surface = _____________(either inside or outside of cell)
Proteins that stick INTO membrane = ________________(can go part way in or all the way through)
PERIPHERAL
INTEGRAL
Recognize “self”
GLYCOPROTEINS
GLYCOPROTEINS are PROTEINS with carbohydrates attached
Image from: http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Lectures/Membranes/membrane.htm
1.What are some things that can pass through a window screen?
Answers may include air, fine dust, and rainwater.
2.What are some things that cannot pass through a window screen? Why is it important to keep these things from moving through the screen?
Insects, leaves, and other matter that may fall from trees. The screen
keeps out annoying insects and objects that may bring dirt into the home.
3. The cell is surrounded by a cell membrane, which regulates what enters and leaves the cell. Why is it important to regulate what moves into and out of a cell?
Materials such as oxygen and food that are needed by the cell have to be able to get inside the cell. At the same time, excess materials have to leave the cell.
WHAT DOES IT DO?
Acts as a boundaryControls what enters and leaves cell
Images from: http://vilenski.org/science/safari/cellstructure/cellmembrane.html http://www.mccc.edu/~chorba/celldiagram.htm
Cell membranes MOVE!
Molecules in cell membranes are
constantly moving and changing
Click here to See Fluidity
Animation from: http://www.sp.uconn.edu/~terry/images/anim/fluidmem.gif
CYTOPLASM (Between nucleus and cell
membrane)
ORGANELLE-small structure with a specific function (job)
Image from: http://vilenski.org/science/safari/cellstructure/cytoplasm.html
Image from: http://faculty.stcc.cc.tn.us/jiwilliams/labprojectsmenu.htm
Organelles suspended in gel-like goo
CELL MEMBRANE (PLASMA MEMBRANE)
Made mainly of ____________________ and _________________HYDROPHOBIC “tails” of phospholipids make molecules line up as LIPID ________________ with POLAR heads facing _______ & NON-POLAR tails facing ________ Proteins attached to surface (inside or outside)= _____________Proteins stuck into membrane = ______________ (can go part way in or all the way through)
OTHER MOLECULES:• GLYCOPROTEINS (proteins with ___________attached)•STEROIDS (lipids)
Membranes are ____________________________________(=Semi-permeable) Allow certain molecules to pass through; but keep others
out
__________________ = gel-like material + organelles between nucleus and cell membrane
“recognize self”
phospholipids proteins
BILAYER outin
PeripheralIntegral
sugars
SELECTIVELY PERMEABLE
cytoplasm
NUCLEUS
Largest organelle
in animal cells
Image from: http://www.mccc.edu/~chorba/celldiagram.htm
NUCLEUS
Surrounded by NUCLEAR ENVELOPE
(also called NUCLEAR MEMBRANE)
DOUBLE MEMBRANE
Image from: http://www.agen.ufl.edu/~chyn/age2062/lect/lect_06/5_11.GIF
NUCLEUS
NUCLEAR PORES Openings to allow molecules to move in and out of nucleusImage from: http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookCELL2.html
WHAT DOES IT DO?Contains genetic material (DNA)
DNA is spread out as CHROMATINin non-dividing cells
DNA is scrunched up as CHROMOSOMES
in dividing cells
WHAT DOES IT DO?
Control center of cell
Image from:
Genetic code tells the cell’s parts what to do
Image from: http://web.jjay.cuny.edu/~acarpi/NSC/12-dna.htm
NUCLEOLUS
Dark spot in nucleus = __________
Makes RNA for ribosomes
Image from: http://lifesci.rutgers.edu/~babiarz/histo/cell/nuc3L.jpg
NUCLEOLUS
NUCLEUS NUCLEOLUSSurrounded by ______________ MEMBRANE called the NUCLEAR __________________ ___________ CENTER OF CELL Nuclear ___________ allow molecules in & outCONTAINS GENETIC MATERIAL (_______)Dark spot = NUCLEOLUS makes ___________________ (RNA) DNA is scrunched up as ______________ in dividing cells.DNA is spread out as ________________ in non-dividing cells.
ENVELOPE
PORESCONTROL
DNA
RIBOSOMES
CHROMOSOMES
CHROMATIN
DOUBLE
CYTOSKELETON• Helps cell maintain shape
• Help move organelles around
Made of PROTEINS:
MICROFILAMENTS (Actin) & MICROTUBULES (Tubulin)
Image from: http://anthro.palomar.edu/animal/default.htm
Image from: © Pearson Education Inc, Publishing as Pearson Prentice Hall; All rights reserved
CYTOSKELETONMade of PROTEINS called______________ & _________________
FUNCTION: ____________________________________________________________
MICROTUBULES MICROFILAMENTS
Helps cell maintain shape; Support; Helps in movement
CENTRIOLES
Appear during cell division to pull chromosomes apart
CENTRIOLES/MITOTIC SPINDLE
Made of MICROTUBULES (Tubulin)
Image from: http://www.coleharbourhigh.ednet.ns.ca/library/organelle_worksheet.htm
CENTRIOLESMICROTUBULES
ANIMAL
Made of __________________________
Only seen in _______________ cells during cell division
Function:__________________________________Pull chromosomes apart;
MITOCHONDRION (plural=MITOCHONDRIA
)
Look like “little sausages”
Image from: http://instructional1.calstatela.edu/dfrankl/CURR/kin150/Images/mitochondria.jpg
MITOCHONDRIASurrounded by a
DOUBLE membrane
Folded inner membrane increases surface areafor more chemical reactions
Image from: http://www.biologyclass.net/mitochondria.jpe
Has its own DNA
MITOCHONDRIA
Come from cytoplasm in EGG
You inherit your mitochondria from your mother!
http://www.wappingersschools.org/RCK/staff/teacherhp/johnson/visualvocab/p14%5b1%5d.jpg
WHAT DOES IT DO?
Burns glucose to release energy
Stores energy as ATP
“Powerplant of cell”
Images from: http://vilenski.org/science/safari/cellstructure/mito.html
http://www.estrellamountain.edu/faculty/farabee/biobk/BioBookCHEM2.html
Image by: Riedell
MITOCHONDRION (pl. MITOCHONDRIA) Surrounded by _____________ membrane Contains its own ___________ _______________ of cell Burns ____________ Stores energy released as ______
Folded inner membrane = _________________ (increases surface area for more chemical reactions)
DOUBLE
DNAPower plant
GLUCOSEATP
CRISTAE
ENDOPLASMIC RETICULUM
2 KINDS:SMOOTH or ROUGH
Network of hollow membrane tubules
Image from: http://www.agen.ufl.edu/~chyn/age2062/lect/lect_06/5_10B.GIF
ROUGH ENDOPLASMIC RETICULUM (Rough ER)
Makes membrane proteins and proteins for export out of cell
Image from: http://www.biologyclass.net/endoplasmic.jpe
Animation from: http://vilenski.org/science/safari/cellstructure/er.html
ROUGH ENDOPLASMIC RETICULUM (ER)
• Has RIBOSOMESattached
• Proteins are made on ribosomes and inserted into Rough ER to be modified and transported
Image from: http://fig.cox.miami.edu/~cmallery/150/cells/ER.jpg
SMOOTH ENDOPLASMIC RETICULUM (smooth
ER)
• Has NO ribosomes attached
• Has enzymes for special tasks
Image from: http://www.science.siu.edu/plant-biology/PLB117/JPEGs%20CD/0073.JPG
SMOOTH ENDOPLASMIC RETICULUM (smooth
ER)Image from:http://www.accs.net/users/kriel/chapter%20eight/smooth%20er.gif
•Makes membrane lipids (steroids) •Regulates calcium (muscle cells) •Destroys toxic substances (Liver)
ENDOPLASMIC RETICULUM
ROUGH ER SMOOTH ER (with ribosomes) (no ribosomes)
Internal Network of membranes Rough ER: Attached ribosomes make _________________ which are modified and transported to Golgi for export
Smooth ER:
Makes membrane lipids(__________________) Regulates ________________ in muscles
Breaks down _________________ in liver
PROTEINS
STEROIDS
CALCIUM
TOXINS
RIBOSOMES
•Made of PROTEINS and RNA
•Protein factory for cellJoin amino acids to make proteins
Image from: http://www.ust.hk/roundtable/hi-tech.series/1_b1.jpg
Image by: RIedell
RIBOSOMES
Can be attached to Rough ER
OR
free in cytoplasm
Image from: http://www.mccc.edu/~chorba/celldiagram.htm
Image from: http://www.biologyclass.net/endoplasmic.jpe
RIBOSOMESCan be _________ or ___________ to Rough ER
MADE OF ______________ & ________
FUNCTION: _____________________
FREE ATTACHED
PROTEINS RNA
MAKE PROTEINS
GOLGI APPARATUS (BODY)• Pancake like
membrane stacks
Modify, sort, & packagemolecules from ERfor storage OR transport out of cell
Image from: http://vilenski.org/science/safari/cellstructure/golgi.h
Image from: http://vilenski.org/science/safari/cellstructure/golgi.h
Image from: http://www.rsbs.anu.edu
Animation from: http://www.franklincollege.edu/bioweb/A&Pfiles/week04.html
See a Golgi movie
GOLGI APPARATUS (BODY)Looks like a “______________________”Made of ______________________
FUNCTION: Modify, sort, & package substances from ER for ______________ or_______________ out of cell
stack of pancakesmembranes
exportstorage
It’s ALL connected!
LYSOSOMES
Membrane bound sacs that contain PROTEINScalled digestive enzymes
Animation from: http://vilenski.org/science/safari/cellstructure/lysosomes.html
Digest food, unwanted molecules, old organelles, cells, bacteria, etc
LYSOSOMES
Image modified from: http://www.people.virginia.edu/~rjh9u/lysosome.html
See lysosomes in action:
LYSOSOMES
Image from: http://www.people.virginia.edu/~rjh9u/lysosome.html
http://www.mgm.ufl.edu/images/bharfe/image3.jpghttp://research.yale.edu/ysm/images/78.3/articles-apoptosis-cells.jpg
“PROGRAMMED CELL DEATH” = ______________________APOPTOSIS
Lysosomes help digest unwanted cells
Apoptosis plays a role in:
Embryonic developmentNormal body cell
maintenance Immune system responses
CancerAIDS infectionTransplant rejection
http://www.cellsalive.com/apop.htm
LYSOSOMES
Sac containing _________________________
FUNCTION: Digests __________________________________
Plays a role in ____________“Programmed cell death”Cell suicide for the good of the organism
Digestive enzymes
food molecules & unwanted cells/cell parts;
APOPTOSIS
FLAGELLA & CILIA
Made ofPROTEINS called MICROTUBULES
(9 + 2 arrangement)
Image from: http://www.stchs.org/science/courses/sbioa/metenergy/flagella.jpg
FLAGELLA
Help in cell movement
CILIA
Move cell itself
Animation from: http://web.jjay.cuny.edu/~acarpi/NSC/13-cells.htm
CILIA
Move substances past cells
http://www.sk.lung.ca/content.cfm?edit_realword=hwbreathe
CILIA•Many•short
FLAGELLA•Few•Long
WHAT’S THE DIFFERENCE?
Animation from: http://web.jjay.cuny.edu/~acarpi/NSC/13-cells.htm
CILIA & FLAGELLAMade of PROTEINS called _______________organized in a _________ arrangement that help with ___________________
CILIA ________ & __________
FUNCTION: ______________________
FLAGELLA ______ & ________
FUNCTION: _________________
MICROTUBULES
9 + 2MOVEMENT
MANY SHORT
Move cells; move substances past cells
FEW LONG
Move cells
WHAT’S SPECIAL ABOUT PLANT CELLS?
• Cell wall
• HUGE vacuoles
• Chloroplasts
• No centrioles
CELL WALLSupports and
protects cell
Outside of cell membrane
Made of carbohydrates & proteins
Plant cell walls are mainly _____________CELLULOSE
http://web.jjay.cuny.edu/~acarpi/NSC/13-cells.htm
http://www.windows.ucar.edu/kids_space/images/brick_wall.jpg
CELL WALLFound OUTSIDE the ____________________Provides ____________ & ________________
___________________ makes plant cells sturdy Bacteria have cell walls made of _______________
Cell membrane
SUPPORT PROTECTION
CELLULOSE
PEPTIDOGLYCAN
VACUOLES
Storage space
Image from: http://www.biologycorner.com/resources/plant_cell.gif
VACUOLES
• Storage space for WATER, salts, proteins (enzymes), carbohydrates, and waste
Vacuoles SMALL in ANIMAL CELLSNO VACUOLES IN BACTERIA
Image from: http://www.metoliusfriends.org/csca/images/tupperware.jpg
Contractile vacuoles control excess water in cells
(HOMEOSTASIS)
1
http://www.microscopy-uk.org.uk/mag/imgjun99/vidjun1.gif
VACUOLESStorage space for: _______________Proteins, carbohydrates,
water, waste
Huge in __________cells , small in _____________ cells,Not in _________________
plantanimalbacteria
CHLOROPLASTS
• Use energy from sunlight to make own food (glucose)
http://stallion.abac.peachnet.edu/sm/kmccrae/BIOL2050/Ch1-13/JpegArt1-13/04jpeg/04-28_chloroplasts_1.jpg
http://www.seorf.ohiou.edu/~tstork/compass.rose/photosynthesis/chloro_sun_bathing.gif
CHLOROPLASTS
• Surrounded by DOUBLE membrane
• Contains own DNA
http://media.pearsoncmg.com/bc/bc_campbell_essentials_2/cipl/04/HTML/source/04-17-chloroplast-nl.htm
•Thylakoid membrane sacs contain enzymes for photosynthesis
CHLOROPLASTSurrounded by ____________ membrane Has own ________ _____________ =membrane sacs inside
Contain CHLOROPHYLL where _______________________ happens
FOUND ONLY IN _____________ CELLS
PHOTOSYNTHESIS
DOUBLE
DNATHYLAKOIDS
PLANT
Go to Section:
Plant Cell
Nuclearenvelope
Ribosome(attached)
Ribosome(free)
Smooth endoplasmicreticulum
Nucleus
Rough endoplasmic reticulum
Nucleolus
Golgi apparatus
Mitochondrion
Cell wall
CellMembrane
Chloroplast
Vacuole
Section 7-2
Figure 7-5 Plant and Animal Cells
WHAT’S DIFFERENT ABOUT BACTERIAL CELLS?
• Cell wall
• NO NUCLEAR MEMBRANE
• DNA is circular
• No membrane bound organelles
http://www.eurekascience.com/ICanDoThat/bacteria_cells.htm
BACTERIA have a CELL WALL BUT…
IT’S MADE OF DIFFERENT MOLECULES
than plant cell walls!
_______________ NOT CELLULOSE!
Image from: http://micro.magnet.fsu.edu/cells/procaryotes/images/procaryote.jpg
PEPTIDOGLYCAN
WHICH IS BIGGER?
_________ > _____________ > ___________Plant cell Animal cell bacteria
DIFFERENCES IN ANIMAL CELLS, PLANT CELLS, AND BACTERIA
ANIMAL CELL PLANT CELL BACTERIA
Eukaryotes Eukaryotes Prokaryotes
Cell membrane Cell membrane Cell membrane
Nuclear membrane
Nuclear membrane
NO nuclear membrane
NO cell wall Cell wall made of
CELLULOSE
Cell wall made ofPEPTIDOGLYCAN
Has ribosomes Has ribosomes Has ribosomes
DNA in multiple chromosomes
DNA in multiple chromosomes
DNA is a single circular ring
CYTOSKELETON CYTOSKELETON CYTOSKELETON
Small vacuoles Really big vacuole
NO vacuoles
Has lysosomes Has lysosomes NO lysosomes
Has centrioles NO centrioles NO centrioles
NO chloroplasts Chloroplasts NO chloroplasts
SMALLER SMALL SMALLEST
BACTERIA arePROKARYOTES
PLANTS & ANIMALSare EUKARYOTES
No membrane bound organelles
Organelles with membranes
USE WORDS FROM THE WORD BANKS TO COMPLETE THE VENN DIAGRAM COMPARISON
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