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Activity

Pair and Share

THINK with your partner

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Generating Ideas

1.What are the substances required

by cells?2.What are the substances that need

to be eliminated from cells?

3. Necessity for the movement ofsubstances across the plasmamembrane

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Materials required by a cell

Materials Utilisation

Oxygen Cell respiration.

Glucose Cell respiration.

Water Photosynthesis (in plant), to

maintain the osmotic pressure of

a cell, cell metabolisme.

Glycerol andfatty acid

Raw materials for lipidsynthesis.

Vitamins and

mineral ions

Normal function of cell.

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Materials excreted from cell

Materials Source

Carbon dioxide (animal) Respiration

Oxygen (plant) Photosynthesis

Nitrogenous waste (urea,

uric acid and ammonia)

Breakdown of excess

protein

Some hormones,extracellular enzymes and

neurotransmitter.

Certain cell

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Necessity for the Movementof Substances Across the

Plasma Membrane Maintain the correct ion concentration & cellular

pH for enzyme functions.

Obtain nutrients that provide energy & rawmaterials for cell metabolism.

Remove toxic and waste materials from the cell.

Create the ion concentration gradient needed fornerves and muscle to function.

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PoemS. Singer and G. Nicolson are

scientists,

They work together on plasmamembrane,

In 1972, they named the structure,

They proposed as a fluid mosaic model.

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Fluid Mosaic Model

What they proposed????

Membrane proteins are inserted

into the phospholipids bilayer.

The phospholipids bilayer,

proteins and other component arenot rigid or static but form adynamic and flexible structure.

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Why the plasma membrane isdescribed as a fluid mosaic?

The protein molecules float aboutin the phospholipids bilayer

creating a mosaic pattern. Its fluidity is due to the

movement of the phospholipids

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Activity

Group discussion

Describe the component of plasmamembrane structure.

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Phospholipid

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The Structure of PlasmaMembrane

Composed mainly of phospholipid andproteins

Each phospholipid molecule

1. polar head hydrophilic property2. non-polar tail hydrophobic property

Phospholipid bilayer act as a barrier which

isolates the 2 sides of the membrane. Contain cholesterol link the fatty acid

together

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The Structure of PlasmaMembrane

Cholesterol stabilise and strengthen theplasma membrane, making it more flexible andless permeable to water soluble substansces

such as ion.

What happen when plasma membranes do

not have cholesterol???Too fluid and are likely to burstat normal body temperature.

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Activity

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Question 1

The polar parts of phospholipid are said

to be

A. PhosphateB. Hydrophilic

C. Hydrophobic

D. Hydrocarbonic

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Question 2

What are the main components of a plasma

membrane?

I. Phospholipids III. Carbohydrates

II. Proteins IV. VitaminsC. I and II

B. I and IV

C. I and IIID. III and IV

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Question 3

Model for the structure of plasma membraneis introduced in 1972. This model is known

as

A. Danielli Davson ModelB. Sandwich Mosaic Model

C. Fluid Mosaic Model

D. Rigid Mosaic Model

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Question 5

What is the function of cholesterol moleculesin the plasma membrane?A. As membrane carriers to move substances

across the plasma membraneB. To form protein channels to move

substances across plasma membraneC. To join the proteins with phospholipid

moleculesD. To stabilise the fluidity of the plasma

membrane

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Question 6

Plasma membrane is described as havingmosaic pattern because__________A. Protein is rigid and cannot move

throughout the plasma membraneB. Protein is floating about in the plasma

membraneC. Cholesterol help to make the plasma

membrane become flexibleD. Cholesterol help to stabilise the plasma

membrane

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Question 7Absence of cholesterol will cause the

plasma membrane toI. Too fluid at hot temperatureII. Freeze at low temperatureIII.More permeable to water soluble substances

IV. Less permeable to water soluble substancesE. I and IIF. I,II and IIIG. I, II and IV

H. I and IV

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Assessment

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1.Label the structure of plasma membrane

a

b

c

d

f

g

h

e

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Question 2

The property of non-polar tail of

phospholipids is _______.

A. HydrophilicB. Hydrophobic

C. Nucleophilic

D. Nucleophobic

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Question 3

Plant cells required these substances

EXCEPT

A. Carbon dioxideB. Oxygen

C. Water

D. Mineral ions

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Question 4

Carrier protein helps to transport these

molecule

A. GlucoseB. Amino acid

C. Sodium ion

D. Vitamin

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Question 5

The function of cholesterol is/are _______I. Stabilise the plasma membraneII. Strengthen the plasma membrane

III.Make plasma membrane more flexibleIV. Link the fatty acid togetherE. I,II and III

F. I,II and IVG. II,III and IVH. I,II,III and IV