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
II. Subject Matter:
A. Topic: Cell Membrane and Cell Wall
B. Reference: whatislife.com/education/fact/history_table.html
C. Materials: PowerPoint Presentation, illustration boards
A. Routinary Activities
2. Classroom Management
4. Checking of Attendance
5. BioBits(Trivia of the Day)
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
• 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?
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.
C. Lesson Proper
Task 1: Using a PowerPoint presentation, the teacher will present the topic
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.
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.
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.
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
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.
The cell membrane is primarily composed of a mix of proteins and
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.
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.
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.
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.
Direction: Provide the information being asked. Write your answers on a ¼ sheet of
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
7. He discovered the cell wall.
8-10. Give 3 functions of the cell wall.
Read on the aids of cells for locomotion. Write your findings on a ½ crosswise yellow paper
Jan del Rosario