B111 Fall 2014 - L6 Membranes

8/10/2019 B111 Fall 2014 - L6 Membranes

http://slidepdf.com/reader/full/b111-fall-2014-l6-membranes 1/24

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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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N E T F L O W I N = N E T

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A N I M A L SS O H O W D O A N I M A L S

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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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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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Documents

B111 Fall 2014 - L6 Membranes