CELLS AS THE BASIC UNIT OF LIFE What

CELLS AS THE BASIC UNIT OF LIFE

What is cell? � Identify cell as the basic unit of living things �Use a microscope �Identify drawing and labeling general structure of cell �Comparing between animal cells and plant cells �Explain the function of each cell structure

INTRODUCTION �A cell is the basic unit of a life. �Its size is too small to be seen with the naked eye. �We need an instrument called a microscope to observe cells.

EXAMPLE OF CELL: Human cheek cell Onion cell

So, how can we see the cell? ? ? We can see it using…….

MICROSCOPE

The functions of microscope’s parts Part Function Eyepiece To magnify the image formed by the objective lens Objective lens To magnify image of the object Stage clip To hold the microscope slide in position Adjustment knob To get a sharper focus of the object Diaphragm To control the amount of light entering the objective lens Stage To support the microscope slide

Cell can be divided into 2 types: Animal cell Plant cell

Similarities and differences of both cells: Animal Cell Similarities Plant Cell Both cell have: Ø Cell membrane Ø Cytoplasm Ø Nucleus Animal Cell Differences Has cell wall Cell wall Definite shape Usually large vacuole Has Chloroplast Shape Vacuole Chloroplast Plant Cell None Indefinite shape Usually has no vacuole None

Functions of Cell…. CELL STRUCTURES FUNCTIONS Cell Membrane Controls the movement of materials in and out of the cell Cytoplasm Allows chemical reactions to take place Nucleus Controls all cellular activities. It contains genetic information Cell Wall Maintains the shape of the cell Vacuole Contains cell sap. Cell sap is a liquid with dissolved substances such as sugar and salt

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