tour of the cell 1 · 2013/10/05 · ap biology why organelles? specialized structures specialized...
TRANSCRIPT
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AP Biology 2013-2014
Tour of the Cell 1
http://www.dnatube.com/video/55
1/The-Inner-Life-Of-A-Cell-HQ
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AP Biology
Cytology: science/study of cells
Electron microscopy – electron beam
TEM: to study cell internal ultrastructure
SEM: to study cell surfaces
To view cells: Light microscopy
resolving power: measure of clarity
http://www.vcbio.science.ru.nl/en/fes
em/info/cryosem/
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AP Biology
SEM Cool
images
dog flea Foraminifera
(a protist)
Leaf part
Polysterene
aggregate
Pb(Zr, Ti)O3
Micro- & nano
organisms
hair
http://www.vcbio.science.r
u.nl/en/fesem/applets/flea/
Leaf (guard cells)
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AP Biology
Cytology: science/study of cells
http://www.youtube.com/watch?v=8B
nES4T1RDk
To isolate organelles:
Cell fractionation: to separate major organelles
Ultracentrifuge: cell fractionation;
130,000rpm or 1,000,000 g
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AP Biology
NUCLEI
MITOCHONDRIA
MEMBRANES -
ROUGH
ENDOPLASMIC
RETICULUM
Centrifuge at LOW SPEED
for 10 minutes
Centrifuge at MODERATE
SPEED
for 15 minutes
Centrifuge at HIGH SPEED
for 30 minutes
Organelle Isolation: Cell Fractionation & Ultracentrifugation
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AP Biology
Size is relative
http://www.cellsalive.com/howbig.htm
http://htwins.net/scale2/
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AP Biology
Cell Size http://learn.genetics.utah.edu/content/begin/cells/scale/
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AP Biology
Cell Radius 1 2 3 4
SA (r2) 1 4 9 16
V (r3) 1 8 27 64
SA = 4 r2
V = 4/3 r3
SA/V (r2/r3) 1 1/2 1/3 1/4
Cell Size
V > SA
r V and SA
r SA/V
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AP Biology
Cell Size As cell size increases, the SA to V ratio
decreases
Rates of chemical exchange may then be
inadequate for cell size
Cell size, therefore, remains small
What happens when the cell reaches a
critical size?
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AP Biology
Prokaryote
bacteria cells Types of cells
Eukaryote
animal cells
- no organelles
- organelles
Eukaryote
plant cells http://www.yellowtang.org/animations/cell_features_v2.swf
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AP Biology
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AP Biology
Cell Types: Prokaryotic
Nucleoid: DNA
concentration
No organelles with
membranes
Ribosomes:
protein synthesis
Plasma membrane:
(all cells); semi-permeable
Cytoplasm/cytosol (all cells)
Prokaryotes contain no
organelles.
Organelles are
membrane bound.
Ribosomes are not
membrane bound.
Ribosomes are not
organelles.
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AP Biology
Cell types: Eukaryotic
Nucleus:membrane enclosed organelle
containing chromosomes
Membrane bound organelles of
specialized form and function
Generally larger than prokaryotic cells
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AP Biology
Why organelles? Specialized structures
specialized functions
cilia or flagella for locomotion
Containers
partition cell into compartments
create different local environments
separate pH, or concentration of materials
distinct & incompatible functions
lysosome & its digestive enzymes
Membranes as sites for chemical reactions
unique combinations of lipids & proteins
embedded enzymes & reaction centers
chloroplasts & mitochondria
mitochondria
chloroplast
Golgi
ER http://www.cellsalive.com/cells/cell_model.htm
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AP Biology
Cells must work to live! What jobs do cells have to do?
make proteins
proteins control every
cell function
make energy
for daily life
for growth
make more cells
growth
repair
renewal
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AP Biology 2013-2014
Building Proteins
http://www.johnkyrk.com/aminoacid.ht
ml
http://sciencenetlinks.com/interactives/
protein.html
http://www.phschool.com/
atschool/phsciexp/active_
art/protein_synthesis/inde
x.html
http://www.rcsb.org/pd
b/101/static101.do?p=
education_discussion/
educational_resources/
index.html#Posters-
Exhibits
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AP Biology
Proteins do all the work!
cells
DNA
proteins
organism Repeat after me…
Proteins do all the work!
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AP Biology
Cells functions http://vcell.ndsu.nodak.edu/animations/proteinmodification/
movie-flash.htm
Building proteins
read DNA instructions
build proteins
process proteins
folding
modifying
removing amino acids
adding other molecules
e.g, making glycoproteins
for cell membrane
address & transport proteins
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AP Biology
Building Proteins Organelles involved
nucleus
ribosomes
endoplasmic reticulum (ER)
Golgi apparatus
vesicles
nucleus ribosome ER Golgi
apparatus vesicles
The Protein Assembly Line
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AP Biology
nuclear pores
nuclear pore
nuclear envelope
nucleolus
histone protein
chromosome
DNA
Function
protects DNA
Structure
nuclear envelope
double membrane
membrane fused in spots to create pores
allows large macromolecules to pass through
Nucleus
What kind of molecules need to
pass through?
http://www.youtube.com/watch?
v=gbSIBhFwQ4s
http://www.biostudio.com/demo_fre
eman_dna_coiling.htm
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AP Biology
DNA Wrapping
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AP Biology
DNA Packaging
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AP Biology
DNA
Nucleus mRNA
nuclear membrane
small ribosomal
subunit
large ribosomal
subunit
cytoplasm
mRNA
nuclear pore
production of mRNA
from DNA in nucleus
mRNA travels from
nucleus to ribosome
in cytoplasm through
nuclear pore
1
2
http://www.dnalc.org/resources/3d/12-transcription-basic.html
http://www.dnalc.org/view/15481-Translation-RNA-to-
protein-3D-animation-with-no-audio.html
http://www.youtube.com/watch?v=I9ArIJWYZHI
http://www.youtube.com/watch?v=4jtmOZa
IvS0&feature=related
http://www.dnalc.org/view/15889-RNA-
polymerase-game-interactive-2D-animation.html
Build RNA
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AP Biology
What kind of molecules
pass through the pore?
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AP Biology
Nucleolus
small subunit
large subunit
ribosome
rRNA & proteins
nucleolus
Function
ribosome production
build ribosome subunits from rRNA & proteins
exit through nuclear pores to cytoplasm &
combine to form functional ribosomes
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AP Biology
Ribosomes
0.08mm
Ribosomes
Rough ER
Smooth ER
small subunit
large subunit
Function
protein production
Structure
rRNA & protein
2 subunits combine
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AP Biology membrane proteins
Types of Ribosomes Free ribosomes
suspended in cytosol
synthesize proteins that
function in cytosol
Bound ribosomes
attached to endoplasmic
reticulum
synthesize proteins
for export or
for membranes
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AP Biology
Endoplasmic Reticulum Function
processes proteins
manufactures membranes
synthesis & hydrolysis of many compounds
Structure
membrane connected to nuclear envelope &
extends throughout cell
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AP Biology
Types of ER
rough smooth
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AP Biology
Smooth ER function Membrane production
Many metabolic processes
synthesis
synthesize lipids oils, phospholipids, steroids & sex hormones
hydrolysis hydrolyze glycogen into glucose
in liver
detoxify drugs & poisons in liver ex. alcohol & barbiturates
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AP Biology
Membrane Factory Build new
membrane
synthesize phospholipids builds membranes
ER membrane expands bud off & transfer
to other parts of cell that need membranes
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AP Biology
Rough ER function Produce proteins for export out of cell
protein secreting cells
packaged into transport vesicles for export
Which cells have lot of rough ER?
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AP Biology
Synthesizing proteins
cytoplasm
cisternal space
mRNA
ribosome
membrane of endoplasmic reticulum
polypeptide
signal sequence
ribosome
http://www.dnalc.org/view/15890-Ribosome-
game-interactive-2D-animation.html
Build a protein
http://www.dnalc.org/view/15481-Translation-
RNA-to-protein-3D-animation-with-no-audio.html
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AP Biology
Golgi Apparatus
Which cells have lots of Golgi?
transport vesicles
secretory vesicles
Function
finishes, sorts, tags & ships cell products
like “UPS shipping department”
ships products in vesicles
membrane sacs
“UPS trucks”
http://www.sumanasinc.com/webcontent/animati
ons/content/vesiclebudding.html
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AP Biology
Golgi Apparatus http://www.goldiesroom.org/Shockwave_P
ages/011--Golgi%20Complex.htm
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AP Biology
Vesicle transport
vesicle budding from rough ER
fusion of vesicle with Golgi apparatus
migrating transport vesicle
protein
ribosome
http://highered.mcgraw-
hill.com/sites/0072495855/student_view0/chapte
r2/animation__lysosomes.html
http://www.goldiesroom.org/Shockwave_Pages/
011--Golgi%20Complex.htm
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AP Biology
Vesicles
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Regents Biology
DNA
RNA
ribosomes
endoplasmic
reticulum
vesicle
Golgi
apparatus
vesicle
protein on its way!
protein finished protein
Making Proteins
TO:
TO:
TO:
TO:
nucleus
You should be able to label each step.
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AP Biology
proteins
transport vesicle
Golgi apparatus
vesicle
smooth ER
rough ER
nuclear pore nucleus
ribosome
cell membrane protein secreted
cytoplasm
Making proteins Putting it together…
Describe “making
proteins”?
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AP Biology
Lysosomes Function
little “stomach” of the cell
digests macromolecules
“clean up crew” of the cell
cleans up broken down
organelles
Structure
vesicles of digestive
enzymes
only in
animal cells
synthesized by rER,
transferred to Golgi
Where old organelles go to die!
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AP Biology
Lysosomes
white blood cells attack &
destroy invaders = digest
them in lysosomes
1974 Nobel prize: Christian de Duve
Lysosomes discovery in 1960s
1960 | 1974
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AP Biology
Cellular digestion Lysosomes fuse with food vacuoles
polymers
digested into
monomers
pass to cytosol
to become
nutrients of
cell vacuole
lyso– = breaking things apart
–some = body
http://highered.mcgraw-
hill.com/sites/0072495855/student_view0/chapte
r2/animation__lysosomes.html
http://highered.mcgraw-
hill.com/olc/dl/120067/bio01.swf
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AP Biology
Lysosomal enzymes Lysosomal enzymes work best at pH 5
organelle creates custom pH
how?
proteins in lysosomal membrane pump H+ ions from
the cytosol into lysosome
why?
enzymes are very sensitive to pH
why?
enzymes are proteins — pH affects structure
why evolve digestive enzymes which function at
pH different from cytosol?
digestive enzymes won’t function well if some leak into
cytosol = don’t want to digest yourself!
http://faculty.ccbcmd.edu/courses/bio141/lecguid
e/unit4/innate/acidification_phagosome.html
http://highered.mcgraw-
hill.com/olcweb/cgi/pluginpop.cgi?it=swf::5
35::535::/sites/dl/free/0072437316/120068
/bio05.swf::Proton%20Pump
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AP Biology
When things go bad… Diseases of lysosomes are often fatal
digestive enzyme not working in lysosome
picks up biomolecules, but can’t digest one
lysosomes fill up with undigested material
grow larger & larger until disrupts cell &
organ function
lysosomal storage diseases
more than 40 known diseases
example:
Tay-Sachs disease
build up undigested fat
in brain cells (autosomal rec)
Mutation in:
hexosaminidase
A, (helps break
down
gangliosides)
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AP Biology
Lysosomal storage diseases
Lipids
Gaucher’s disease
Niemann-Pick disease
Tay Sachs
Glycogen & other polysaccharides
Farber disease
Krabbe disease
Proteins
Schindler’s disease
http://www.youtube.com/wa
tch?v=WbUpMBHioT8
Niemann-Pick Disease
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AP Biology
Lysosomal storage diseases Gaucher’s
-autosomal recessive disorder
-deficiency of glucocerebrosidase,
a lysosomal enzyme that catalyses
the hydrolysis of the glycolipid
glucocerebroside ceramide + glucose
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AP Biology
Lysosomal storage disease
Hepatosplenomegaly courtesy of The
National MPS Society, Inc.
http://www.lysosomallearning.com/heal
thcare/about/lsd_hc_abt_niemann.asp
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AP Biology
But sometimes cells need to die… Lysosomes can be used to kill cells when
they are supposed to be destroyed
some cells have to die for proper
development in an organism
apoptosis
“auto-destruct” process
lysosomes break open & kill cell
ex: tadpole tail gets re-absorbed
when it turns into a frog
ex: loss of webbing between your
fingers during fetal development
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AP Biology
Fetal development
15 weeks
6 weeks
syndactyly
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AP Biology
Apoptosis
programmed destruction of cells in multi-
cellular organisms
programmed development
control of cell growth
example:
if cell grows uncontrollably this self-destruct
mechanism is triggered to remove damaged cell
cancer must over-ride this to enable tumor
growth
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AP Biology
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AP Biology
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AP Biology 2013-2014
Any Questions!!