8/14/2019 kelas bio 9-2-10

1/41

CHAPTER 3

8/14/2019 kelas bio 9-2-10

2/41

8/14/2019 kelas bio 9-2-10

3/41

8/14/2019 kelas bio 9-2-10

4/41

8/14/2019 kelas bio 9-2-10

5/41

MOVEMENT OF

SUBSTANCES ACROSSTHE PLASMA MEMBRANE

8/14/2019 kelas bio 9-2-10

6/41

The Permeability of PlasmaMembrane

Impermeable OR Semi-permeable

Prevent the

passage ofall molecule.

Some substances

can move acrossplasma membranefreely while

others cannot.

8/14/2019 kelas bio 9-2-10

7/41

Why plasma membrane isselectively permeable???

Some substances can move acrossplasma membrane freely while otherscannot.

Hydrophobic tail preventpolarmolecules and large water-solublemolecules from passing them.

8/14/2019 kelas bio 9-2-10

8/41

Eg. lipid-soluble molecules (fatty acids andglycerol) and non-polar molecules (O

2and

CO2) can pass through the plasma membrane

freely. Water also can across the plasma

membrane freely because its molecule is

small enough. Large water-soluble molecules (glucose andamino acids cannot move throughhydrophobic region unless aided by carrier

proteins. Small water-soluble molecules and ions isaided by pore protein

8/14/2019 kelas bio 9-2-10

9/41

8/14/2019 kelas bio 9-2-10

10/41

8/14/2019 kelas bio 9-2-10

11/41

In your group, discuss about passivetransport in term of

i. Simple diffusion group 1ii.Facilitated diffusion group 3

iii.Osmosis group 2

Activity

Group discussion

8/14/2019 kelas bio 9-2-10

12/41

Simple diffusion

Net movement of molecules orions from a region of higherconcentration to a region of

lower concentration, thus goingdown a concentration gradientuntil an equilibrium is achieved.

Does not need energy

Molecules oxygen, carbondioxide and lipid soluble molecules

8/14/2019 kelas bio 9-2-10

13/41

Facilitated diffusion

Net movement of moleculesfrom a region of higherconcentration to a lower

concentration down theconcentration gradient withthe help of protein molecules.

Does not require energy

Water soluble molecules ions,nucleic acid, amino acid andglucose.

8/14/2019 kelas bio 9-2-10

14/41

8/14/2019 kelas bio 9-2-10

15/41

Facilitated diffusion

8/14/2019 kelas bio 9-2-10

16/41

8/14/2019 kelas bio 9-2-10

17/41

8/14/2019 kelas bio 9-2-10

18/41

8/14/2019 kelas bio 9-2-10

19/41

8/14/2019 kelas bio 9-2-10

20/41

Osmosis

8/14/2019 kelas bio 9-2-10

21/41

8/14/2019 kelas bio 9-2-10

22/41

Factor affecting the rate ofdiffusion

8/14/2019 kelas bio 9-2-10

23/41

Activity

8/14/2019 kelas bio 9-2-10

24/41

8/14/2019 kelas bio 9-2-10

25/41

Question 2

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

8/14/2019 kelas bio 9-2-10

26/41

Question 3

Fluid mosaic model was introduced by_____

A. S. Singer and G. Nicolson

B. Danielli and Davson

C. Gregor Mendel

D. Francis Crick

8/14/2019 kelas bio 9-2-10

27/41

8/14/2019 kelas bio 9-2-10

28/41

Question 5

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

8/14/2019 kelas bio 9-2-10

29/41

Question 6Absence 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

8/14/2019 kelas bio 9-2-10

30/41

Question 7

The property of non-polar tail of

phospholipids is _______.

A. HydrophilicB. Hydrophobic

C. Nucleophilic

D. Nucleophobic

8/14/2019 kelas bio 9-2-10

31/41

Question 8

Plant cells required these substances

EXCEPT

A. Carbon dioxideB. Oxygen

C. Water

D. Mineral ions

8/14/2019 kelas bio 9-2-10

32/41

Question 9

Carrier protein helps to transport these

molecule EXCEPT

A. GlucoseB. Amino acid

C. Sodium ion

D. Vitamin

8/14/2019 kelas bio 9-2-10

33/41

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

8/14/2019 kelas bio 9-2-10

34/41

Name the types of passive

transport below

a

b

8/14/2019 kelas bio 9-2-10

35/41

Question 1

During simple diffusion, substancesmove right through the

A. Protein carrier

B. Protein channel

C. Phospholipids bilayer

D. Semi permeable membrane

8/14/2019 kelas bio 9-2-10

36/41

Question 2

The polar parts of phospholipids aresaid to be

A. Phosphate

B. Hydrophilic

C. Hydrophobic

D. hydrocarbonic

8/14/2019 kelas bio 9-2-10

37/41

3. Which of the following terms bestdescribed by the following properties:

Transport without using energy

Follow concentration gradient

Uses protein carierA. Diffusion

B. Facilitated diffusion

C. OsmosisD. Active transport

8/14/2019 kelas bio 9-2-10

38/41

4. Osmosis may be described as the netmovement across a semi permeablemembrane of

A. Solute molecules from a weak solutionto a strong solution

B. Solute molecules from a strong solution

to a weak solutionC. Water molecules from a weak solution to

a strong solution

D. Water molecules from a strong solutionto a weak solution

8/14/2019 kelas bio 9-2-10

39/41

Forms a pore that is filled withwater.

Allow charged molecules to diffuseacross the membrane

5. The above description is aboutA. Sodium pumpB. Carrier protein

C. Channel proteinD. Hydrophilic head

8/14/2019 kelas bio 9-2-10

40/41

assessment

8/14/2019 kelas bio 9-2-10

41/41