Ent 121 lessons

*Lesson on GNS 121*
30/04/2020

We will be treating GNS 121 today

I believe we are know the topic where treating and the subject it’s from

Cell from biology

We will be treating cell today

Cell is a basic unit of life

♻️ *what is cell?*
We will all agree that cell is the simplest, the smallest basic unit of life, truly it is but let us note the key word used in this definition 👇
Cell is the *structural* , *functional* and *fundamental* unit of life which carry out all activities done in the living system. The cell is regarded as the basic unit of life because it can carry out all life activities such as feeding, growth, reproduction, respiration and many more

When we are talking about cell, cell is life it carry out all activities done by living things

Now before we proceed let’s look at cell theory and those who promulgated it

♻️ *Theory of cell*
Theory of cell was promulgated by the accumulation of discoveries of *Robert Hook* (1665), *Theodor Schwann* (1839), *Matthias Schleiden* (1838), *Felix Dujardin* (1835), *Rudolf Von Virchow* (1855). The theory go thus;
▪️All living things are made up of cells
▪️Cells are from pre-existing cell
▪️Cells is the elementary particles of an organism
▪️ There is no life apart from life of cell
▪️All living things are either prokaryotic or eukaryotic

But *Note* that *Robert Hook* can be called the founding father of cell, he discover it using compound microscope magnifying thin slice of a cork of an oak tree

How is living things made up of cell? Are cell combined together to form living things?

Living things are made up of cell because each part of the body either nose, tongue or any part contain thousand of cells

Because every part of human we found cell that was why the scientist said living things are made up of cell

Note human being comprises of billions of cells

We have how many types of cell?

♻️ *we have how many types of cell?*
There are two types of cell that make up a living system which are:
▪️ Prokaryotic cell
▪️ Eukaryotic cell

*Note* that human being comprises of billions of cells which make up their body system
Let’s go to the brief explanation of those cells👇

But I also agree with numerous

So let go to the explanation of the types of cell

▪️ *Prokaryotic cell:* Prokaryotic cell is also called unicellular cell. This type of cell does not have any additional cell but only itself. Organism that posses this type of cell are called unicellular organism e.g bacteria, euglena paramecium etc
▪️ *Eukaryotic cell:* Eukaryotic cell is also called multicellular cell. These are group of cells working in various sections in living system. Organism that posses this type of cell is called multicellular organism e.g bird, man, snake etc.

Pls read this diligently🙏👆

Now we have know the definition of cell, theory of cell, types of cell

Now out of the two types of cell the second one which is Eukaryotic cell also have two types…..

Who can give us the two types of Eukaryotic cell

♻️ There are two types of Eukaryotic cell
▪️ *Animal cell:* This is type of cell is found in both animal and human being though there’s little different in animal and human cell regarding structure and the *organelles* found in it
▪️ *Plant cell:* This type of cell is found in only plant and also have little same *organelles* with animal cell
You might be confuse that what is *organelles?* *Organelles* are structure or working part found in a cell and carry out life functions

Another name for Prokaryotic cell is what?

Unicellular cell

♻️What are the characteristics of the two types of cell which are *Prokaryotic* and *Eukaryotic*

▶️ *Characteristics of bacteria (Prokaryotic)*
They have no true nucleus
They have cell wall
They move with the aid of flagella
They have round single chromosome
They have no membrane bound organelles

▶️ *Characteristics of Bird ( Eukaryotic)*
They have true nucleus
They have cell wall
They posses RNA or DNA
They have membrane bound organelles

*Nucleus➖* it’s an organelle that contains the genetic materials
Cell wall➖ it prevents the cell organelles from outside materials.
RNA➖ it carry the genetic materials
Membrane➖it regulate the going and coming out of substance from the cell

Am Abass tobiloba Samson pka famousloaded 📺

Stay safe

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