YV4-cells-4.5 Membrane transport Diffusion

Ch 4 Cells 
4.5 Membrane transport
Diffusion 
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BiologieMiddelbare schoolvwoLeerjaar 4

This lesson contains 34 slides, with interactive quizzes, text slides and 1 video.

time-iconLesson duration is: 30 min

Items in this lesson

Ch 4 Cells 
4.5 Membrane transport
Diffusion 

Slide 1 - Slide

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Let's check what you memorized from last lesson?


We will start with Quiz Organelles in Lesson Up..

Want to practice some more with the organelles?....

Slide 2 - Slide

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Slide 3 - Link

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Learning goals Membrane transport
Membrane Transport
  • You can explain how a membrane is built
  • You can explain that a membrane is (semi )permeable
Diffusion and Osmosis
  • You can explain how, by means of diffusion and osmosis, compounds can pass through the cell membrane
  • You can explain what consequences this transport might have for cells

Slide 4 - Slide

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Key words
Cell membrane transport
Permeable
Hydrophilic
Hydrophobic
Aquaporine
Diffusion
Facilitated diffusion
Channel protein
Carrier protein
(Semi) permeable
Osmosis


Slide 5 - Slide

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5

Slide 6 - Video

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01:51
What molecules can pass the cell membrane without any difficulty?
A
charged particles / ions
B
glucose
C
water
D
oxygen and carbondioxide

Slide 7 - Quiz

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02:14
'With the concentration gradient' means from...
A
a higher concentration to a lower
B
a lower concentration to a higher

Slide 8 - Quiz

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04:51
In what organelle is the energy-rich ATP generated?

Slide 9 - Open question

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06:52
Pancreatic cells (alvleeskliercellen) create enzymes. When these proteins are completed, they need to be excreted.

By what way do enzymes leave the pancreatic cells?
A
simple diffusion
B
facilitated diffusion
C
active transport
D
exocytosis

Slide 10 - Quiz

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04:51
Active transport requires...

Slide 11 - Open question

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Cell membrane transport
1. Passive: no energy necessary, concentration driven
- (Facilitated) Diffusion
- Osmosis

2. Active: costs energy

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The cell membrane comprises of two layers of phospholipids
Hydrophylic out- and inside
Hydrophobic layer in between
Not permeable to water

Slide 13 - Slide

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aquaporine
A protein channel that allows the diffusion of water in and out the cell
facilitated diffusion
diffusion is made easer by protein channels through the cell membrane

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Which diagram best shows the end result of diffusion?

A
F
B
G
C
H
D
J

Slide 16 - Quiz

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Diffusion is the movement of molecules from an area of _____ concentration to an ______ concentration
A
high, low
B
high, high
C
low, high
D
low, low

Slide 17 - Quiz

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Which is true of passive transport?

A
Moves from low to high concentration
B
Requires energy
C
Moves from high to low concentration
D
Moves against the gradient

Slide 18 - Quiz

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Learning goals Diffusion and Osmosis
You can explain the process of diffusion and osmosis
You know why osmosis is important for the support of plants
You can explain why you shouldn't put salt on a snail
(" niet op iedere slak zout leggen" )

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Slide 20 - Slide

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Describe what happens in the video

Slide 21 - Mind map

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Diffusion
  • Molecules going through the cell membrane
  • Molecules (" go with the flow") move from a high to a low concentration
  • The movement of molecules is random until a balance is reached
  • This is a form of passive transport, because the energy comes from the molecules themselves

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Slide 23 - Slide

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Try to describe what happens using this new information

Slide 24 - Mind map

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Slide 25 - Slide

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How does heat affect diffusion?
A
It has no effect
B
More heat means faster diffusion
C
More heat means slower diffusion

Slide 26 - Quiz

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Effect distance on diffusion

Slide 27 - Slide

The shorter the distance, the faster the molecules will have equal concentrations throughout the space
Effect surface area on diffusion

Slide 28 - Slide

The bigger the surface area, the faster the molecules will be evenly distributed over the available area
Effect concentration gradient on diffusion

Slide 29 - Slide

The bigger the difference in concentration, the faster diffusion will happen
Misconceptions with diffusion
  • Molecules want the concentration to be equal/ try to make the concentrations equal. 

  • Molecules stop moving after the concentrations are equal. 
Molecules never stop moving, but when concentrations are equal there are equal amounts of molecules moving in every direction = balance
Molecules have no mind to think with, they move randomly

Slide 30 - Slide

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Now... can you think of any examples of diffusion in living organisms?

Slide 31 - Open question

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What affects the rate of diffusion?
Diffusion is faster
High temperature
Large surface area
Small surface area
Low temperature
Large particles
Small particles
Large concentration gradient
Small concentration gradient
Shorter distance in between two regions
Longer distance in between two regions

Slide 32 - Drag question

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Special type of diffusion = facilitated diffusion: faster movement (but still no energy or ATP needed)


1.  By channel proteins: charged ions e.g. Na+, Cl-
2. By carrier proteins:  larger polar molecules e.g. sugars, amino acids 


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Channel protein vs. carrier protein
Molecule attaches to the carrier protein at binding site --> carrier protein changes shape --> molecule gets 'delivered' through the cell membrane

Slide 34 - Slide

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