BIOLOGY_PRESENTATION_GROUP-_TREE-1-.pptx

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1. TECHNICAL AND VOCATIONAL TEACHERS’ COLLEGE BIOLOGY ASSIGNMENT ONE GROUP THREE TEACHERS’ NAMES: STUDEN No: MULIMBA TERRENCE 21920 MULENGA ANDREW 21952 ZIMBA JOSHUA 21931 MUSONDA ESTHER 21990 MWEWA BERTHER 21917

2. PROKARYOTIC CELL

3. LESSON OBJECTIVES Upon completion of this lesson, students should: Define the term prokaryotic cell Correctly. Know the names of the basic parts of organelles. Know the functions of the basic parts of organelles. Draw and label the parts of the cell.

4. TYPES OF LIVING THINGS Living things are known as organisms. Organisms are made up of one or more cells Under the kingdom of system, cells are divided into two basic types Prokaryotic cells and Eukaryotic cells

5. TYPES OF LIVING THINGS

6. DEFINITION OF PROKARYOTIC CELL Prokaryotic organisms are commonly called Bacteria. They are cells with simple structure. They have no membrane around the nucleus and lack any membrane bound organelles

7. STRUCTURE OF PROKARYOTIC CELL

8. FUNCTIONS OF PROKARYOTIC CELL CELL WALL Lies outside of the cell membrane. Hels support and protects the cell. Contains long chains of cellulose that hardens the entire structure. Pores in the cell wall allow ions to enter and leave the cell. Example: Think of our college hole fence that limits anyone from trespassing.

9. FUNCTIONS OF PROKARYOTIC CELL RIBOSOMES They are numerous. Cell structure responsible for protein production. Some are attached to the endoplasmic reticulum. Example: Think of school production, what it produces?

10. FUNCTIONS OF PROKARYOTIC CELL CYTOPLASM Jelly-like material that fills the cell Mainly composed of water that also contains enzymes. They mostly hold organelles in place. Example: Think of the air that fills up this entire TVTC

11. FUNCTIONS OF PROKARYOTIC CELL CELL MEMBRANE : Provides support and protection to the cell. Regulates the flow of substances in and out of the cell. Example: Think of the doors and intercom system.

12. FUNCTIONS OF PROKARYOTIC CELL PILI (SINGULAR PILUS): Hair-like structures found on the surface of the cell. They are attached to the other bacterial cells. Shorter pili called Fimbriae helps bacteria attach to surface of the cell. Example: Think of root hairs.

13. FUNCTIONS OF PROKARYOTIC CELL FLAGELLA: Are long whip-like protrusion (structure) used for cellular locomotion. Some are used in few organisms as sensory organs that can sense changes in PH and Temperature.

14. FUNCTIONS OF PROKARYOTIC CELL CAPSULE: Found in bacterial cells Protects the cell when it is engulfed by other organisms. Assists in retaining moisture and Helps the cell adhere to surfaces and nutrients. Example: Think of the police that protects people .

15. FUNCTIONS OF PROKARYOTIC CELL NUCLEOID REGION: Area of the cytoplasm that contains the single bacterial DNA molecule. Stores the genetic information that controls the cell and is passed onto daughter cells Example: Think of the Principal’s office.

16. FUNCTIONS OF PROKARYOTIC CELL MESOSOME: They help in cell wall formation. They participate in DNA replication. They aid in distribution of DNA to the daughter cells. They help in the respiration and secretion process. Example: Think of any production unit.

17. CONCLUSION These are storage bodies in the cytoplasm of bacteria The inclusions vary with the type of bacteria Provide a supply of vital compounds or ions for metabolism Reduce osmotic pressure by tying up molecules in particulate f orm