module bio f4 chap 2

7/31/2019 Module Bio f4 Chap 2

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Form 4

Student name:

Form:

3.1 Movement across plasma membrane

All right reserved. Copyright Azuwin 2009 1

Chapter 3: Movement of substances across the PlasmaMembrane

Module no:APPENDIX D


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As a human, we need to fulfil our

necessity such as food, drink, clothes and

friends. In order to fulfil our necessity, we

need to buy the food supply at store. So,

we need to go out and back to our home.

This goes same with cell. A living cell glucose urea

needs substances from outside to undergo water

metabolic processes. At the same time, oxygen

the metabolic process produce by-product ion CO2

that must be eliminated from the cell. Mineral

If we enter the house trough door, the substances in and out the cells otherwise across the

plasma membrane.


Short test.

What substances need by

cell?

____________________

____________________

____________________

cell

The structure of plasmamembrane.


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The plasma membranes which surround the cell separate the cell from its surrounding.

The plasma membrane consist mainly of :

- phospholipids

- proteins

S. Singer and G. Nicolson proposed a fluid mosaic model to describe the plasma

membrane.

- protein membrane dispersed throughout phospholipids bilayer

- and freely moving throughout the phospholipids.

Now, we will learn about plasma membrane by using cartoon.


Carrier protein Pore protein

Phospholipid

bilayers


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ImpermeableSemi permeable

Permeable

Allowonlysome

substancestopass

throughAllow all

substances to pass

through.

Prevent all

molecules from

pass through.

The bottle represents the cell and the bottle wall represents the membrane.

Here the beads represent the water molecules.

The buttons represent the sugar/ glucose molecules.

When you shake the bottle, what will come out?Does bead or button come out?

Can you explain why this happen?

__________________________________________________________________

_________________________________________________________

__________________________________________________________

________

Which one is the characteristic of the plasma membrane?


A membrane can

be

The permeability of theplasma membrane


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No energy require

Follow concentration gradient (High - low)


Facilitated Diffusion

diffusion of specific particles

along the concentration gradient

(High Low) with the help of

carrier proteins found in the

membrane

glucoseg

The movement of substances across plasma membrane:Passive transport


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Transport that requires energy (Adenosine triphosphate: ATP )

Transport of materials AGAINST the concentration gradient


Diffusion

is the movement of molecule

from high concentration

gradient to low concentration

gradient.g

Osmosis

Movement ofwatermolecule

through a selectively permeable

membrane from high

concentration gradient to low

concentration gradient.c

Short test.

What are the three types of

substances movement do notneed energy?

____________________

____________________

____________________

Can you explain what

concentration gradient in

osmosis is?

The movement of substances across plasmamembrane: Active transport


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Direction: Please fill each stage with correct explanation

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Sodium potassium pump

3.2 Movement of substances across plasmamembrane in everyday life

The effect to the animal cell

Direction: Read the story carefully and answer the questions.

The story about a confuse snail.


1 2

3 4


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I am Larry, the snail. I have a sad story to tell you. This is about my cousin Gary. Gary had

passed away a few weeks ago when he visited my auntie which lives in nearby garden. Today, I

also want to visit my auntie, so please pray so I will be safe in my journey.

Now, I have arrived at a junction.

I see there are three passages that I

can use to go to my auntie place.

Which way shall I choose?

Now, I am remembering before Gary died, he leaved to me some letter. This letter might be use

to help me to make decision.

Dear Larry, when I pass through the freshwater river something wrong happen to my body. I

become expand and I feel like water enters into my body. I quickly return to land and rest at the

secret pathway for a while. After a while I feel better. Then, I enter the seawater but

The letter stops at there without leaving any more clues. What passage I must choose? Poor

Gary, when he was found he is very thin. Maybe because he is shrink and this letter has been

found under his dead body. Help me to choose the way.


Hint!

1. Hypotonic Solution: The solution has a lower concentration of solutes than inside the cell.

Water moves from the solution to inside the cell): Cell Swells and bursts open (lyse)

2. Isotonic: The concentration of solutes in the solution is equal to the concentration of solutes

inside the cell. Water moves equally in both directions and the cell remains same size(Dynamic Equilibrium)

3.Hypertonic: The solution has a higher concentration of solutes than inside the cell. Watermoves out ofthe cell into the solution: Cell shrink.

Swim in the salty sea

Swim in the fresh waterriverr


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Comparison of animal cell (red blood cell) and plant cell in Isotonic, hypotonic and

hypertonic solution

Analogy


Short test.

Why each pathway gives different effect to the snail?

What can you relate between the snails stories with what

happen to the animal cell in same situation?


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What is the comparison between red blood cell, plant cell and the analogy condition?

Red blood cell Human analogy Plant cell


Normal

-Cell in isotonic

solution (0.15 salt

solution)

Haemolysis

-Cell in hypotonic

solution (distilled

water)

Crenation

-Cell in hypertonic

solution (0.5 salt

solution)

Normal

-Cell in hypotonic

solution (distilled

water)

Turgid

-Cell in hypotonic

solution (0.01 M

sucrose solution)

Deplamolysis

(Flaccid)

-Cell in hypotonic

solution (0.06 M

sucrose solution)

Drink much water

No enough water

Effect and application

Take enough amountof water


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Can you give another example that you know related to the concept of isotonic, hypotonic andhypertonic?


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module bio f4 chap 2

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