b111 fall 2014 - l6 membranes
TRANSCRIPT
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B I O 1 1 1 I N T R O T O B I O L O G Y
C E L L S A N D
M E M B R A N E SS T R U C T U R E A N D F U N C T I O N
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C E L L
R E C O G N I T I O N
M AT C H T H E
F I N G E R P R I N T S
M O S T L I K E LY M AT C H =
C L O S E R E L AT I V E
I M P O RTA N T T O B E O N
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0 M
H Y P O T O N I C
0 . 3 M
0 M
H Y P O T O N I CWAT E R M O V E S
I N T O T H E
C E L L
! weight increase
! size increase
! turgor pressureincrease
! influx stopswhen it cannotovercome wall
pressure
0 . 2 5 M
O S M O S I S : T H E PA S S I V E M O V E M E N T O F WAT E R F R O M A P L A C E
T H AT I S P U R E R WAT E R T O A P L A C E T H AT I S M O R E P O L L U T E D
3 M
Osmosis: the passive movement of water from aplace that is purer water to a place that is more
polluted
0 . 3 M
3 M
H Y P E R T O N I C
WAT E R M O V E S
O U T O F T H E
C E L L
! weight decrease
! size decrease
! turgor pressure to0
! efflux stops whenthe concentrations
match
! plasmolysis:membrane pulls
away from cell wall
3 M
C Y T O S O L
S O L U T I O N
Osmosis: the passive movement of water from aplace that is purer water to a place that is more
polluted
0 . 3 M
0 . 3 M
I S O T O N I C
Water moves intoand out of the cell at
same rate!
! no weight change! no size change! no turgor pressure
change
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O S M O -
R E G U L AT I O N
W H I C H WAY D O E S T H E
WAT E R F L O W I N T H I S N M L ?
N O N - I S O T O N I C C A U S E
P R O B L E M S F O R N M L S
O S M O R E G U L AT I O N = WAT E R
B A L A N C E
C O N T R O L F L O W W I T H
O R G A N
C O N T R A C T I L E VA C U O L E
I S I T T H E S A M E
F O R A P L A N T ?
L I F E D E P E N D S O N WAT E R
M A J O R D I F F E R E N C E
B E T W E E N P L A N T S A N D
N M L S ?
C E L L U L O S E WA L L &
VA C U O L E
P L A N T S A N D
T O N I C I T Y
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I S I T R E V E R S I B L E ?
W H I C H I S T H E B E S T
C O N D I T I O N F O R A P L A N T ?
A Q U A P O R I N S
P E T E R A G R ER O D E R I C K
M A C K I N N O N
Published 1991
Nobel prize2003
WAT E R C A N M O V E R A P I D LY
I N A N D O U T
F A S T E R T H A N D I F F U S I O N
! M U S T B E C H A N N E L S
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