Semi-detailed Lesson Plan in Cell Biology

I. Objectives :

At the end of the 90-minute discussion, the students should be able to:

determine the parts of the cell membrane and the cell wall;

describe the cell wall and cell membrane’s structure and function; and

state the importance of selecting people who will enter and influence our

lives.

II. Subject Matter:

A. Topic: Cell Membrane and Cell Wall

B. Reference: whatislife.com/education/fact/history_table.html

biology4kids.com/files/cell_membprot.html

C. Materials: PowerPoint Presentation, illustration boards

III. Procedure:

A. Routinary Activities

1. Greetings

2. Classroom Management

3. Prayer

4. Checking of Attendance

5. BioBits(Trivia of the Day)

6. Drill:

Scrambled Cell

The class will be divided into two groups and shall pick a representative.

Scrambled letters will be flashed on the screen and the students should guess what term

is it. Answers shall be written on the illustration boards given. The group with the

highest point wins.

Pictures of a bank robbery will be flashed on the screen and the teacher will ask the following questions:

• Imagine our establishments, houses and school are permeable to anyone, what do you think will happen to our everyday life?

• Do you think cells also need guards or barriers to protect what’s inside them?

CHNOAIRDITOM Mitochondria

EOIMSSIMeiosis

LESUUCNNucleus

SMELSYOOSLysosomes

LELC EANBEMMCell Membrane

7. Review:

The cell is the basic unit of life. Our body is made up of millions and billions

of them. A cell is like a tiny system. Inside the cell are organelles with different

functions. Among these organelles are: nucleus, mitochondria, Golgi bodies, cell

membrane and cell wall.

B. Motivation:

C. Lesson Proper

Task 1: Using a PowerPoint presentation, the teacher will present the topic

deductively.

The cell is composed of many organelles like the mitochondria, ribosomes,

nucleus, endoplasmic reticulum etc, but before getting into the inside, we must first

pass through an opening, and the passages into the inside of the cell are the cell wall

and the cell membrane.

Cell Wall

History

The cell wall was discovered by Robert Hooke in 1665. Cell wall is a

rough, generally flexible layer that surrounds some types of cells. It is

situated outside the cell membrane and it provides these cells with

structural support as well as protection.

Structure

While cell membranes might be around every cell, cell walls made of

cellulose are only found around plant cells. Cell walls are made of specialized

sugars called cellulose.

Cellulose provides a protected framework for a plant cell to survive.

It's like taking a water balloon and putting it in a cardboard box. The balloon

is protected from the outside world. Cellulose is called a structural

carbohydrate (complex sugar) because it is used in protection and support.

Major regions of the cell wall:

Middle lamella, primary wall, secondary wall.

Components: cellulose; cross linking glycans; peptic polysaccharides;

protein; lignin; suberin, wax, cutin; water.

Functions:

A. maintaining/determining cell shape

B. support and mechanical strength

C. prevents the cell membrane from bursting

D. controls cell growth and cell volume

E. physical barrier

F. carbohydrate storage

G. signaling

Cell Membrane

History:

In 1855, C. Naegeli and C.Cramer describe the cell membrane as a

barrier essential to explain osmosis in plant cells.

The Cell Membrane

The cell membrane(also known as the plasma membrane or

cytoplasmic membrane) is a biological membrane that separates the interior

of all cells from the outside environment. The cell membrane is selectively

permeable to ions and organic molecules and controls the movement of

substances in and out of cells.

Structure

The cell membrane is primarily composed of a mix of proteins and

lipids.

Lipids help to give membranes their flexibility while proteins

maintain and monitor the cell’s chemical climate and assist in the

transfer of molecules across the membrane

Components of the Cell Membrane:

Lipids (Phospolipids, cholesterol and glycolypids) and proteins.

Functions

The cell membrane (plasma membrane) is a thin semi-permeable

membrane that surrounds the cytoplasm of a cell. Its function is to protect

the integrity of the interior of the cell by allowing certain substances into the

cell, while keeping other substances out. It also serves as a base of

attachment for the cytoskeleton in some organisms and the cell wall in

others. Thus the cell membrane also serves to help support the cell and help

maintain its shape. Animal cells, plant cells, prokaryotic cells, and fungal

cells have cell membranes.

By having enough knowledge about the characteristics of the cell

wall and the cell membrane, we can say that sometimes we also have to

make an semi-permeable membrane for our lives which will be selective on

people who will enter and influence our lives.

D. Generalization

The cell membrane is the thin-semipermeable layer of the cell that holds it, it

is composed of lipids and proteins and is generally found on animal cells, it serves

different functions in the cell like maintaining cell shape and controlling chemicals

going inside the cell.

The cell wall is generally found on plant cells and is composed of cellulose,

protein, water and other components, its function is to maintain cell shape, store

carbohydrates, prevent the cell membrane from bursting and more.

E. Application

Cell Membrane and Cell Wall Model Construction

The class will be divided into four groups. Lots will be drawn to determine

which group will construct the cell wall and the cell membrane model. Using any

material they have on hand, the students will construct their model within 15

minutes. After the time given, the teacher will choose the best model.

IV. Evaluation

Direction: Provide the information being asked. Write your answers on a ¼ sheet of

yellow paper.

1. The cell membrane is made up of _______ bilayer.

2. The tails of the bilayer are ______

3. The heads are ______

4. _________is a process where water can pass across the cell membrane.

5. Constitutes most of the cell wall at about 75-80%.

6. They described the cell membrane as a barrier essential to explain osmosis in

plant cells.

7. He discovered the cell wall.

8-10. Give 3 functions of the cell wall.

V. Assignment

Read on the aids of cells for locomotion. Write your findings on a ½ crosswise yellow paper

Prepared by: Jan del

Rosario

3SED-SC