1. The Cell

2. The cell is the basic unit of life

3. Structures and Functions
Three main cell components:
1. Cell membrane(seen with microscope)
- a flexible barrier that surrounds the cell content, allowing the cell to interact with the environment
Functions:
- forms barrier and protects cell
- facilitates absorption (nutrients &other substances)
- facilitates the evacuation(wastes & substances)

4. 2. The Cytoplasm(seen with microscope)
- gelatinous fluid inside the cell membrane & outside the nucleus
Function:
- environment hospitable for most cell activities

5. The Nucleus(seen with microscope)
-Cell’s control centre (dark in colour)
Function
- Contains and protects individual genetic information

6. Organelles Cytosol is the gelatinous substance of the cytoplasm
Organelles: small structure in the cytosol which have specific functions
Ex. Mitochondria, Golgi apparatus etc.

7. Diffusion
Transport of molecules of a solute from a region of higher concentration to one of lower concentration

9. Osmosis When water moves across a cell membrane
Water moves from area of high concentratoin to area of low concentration

11. Cell division Production of new cells for growth,
tissue repair, and sexual reproduction
two types

12. Mitosis Cells multiply for growth & tissues repair
Diploid cells: 23 pairs of chromosomes
Ex. 1 divides into 2 daughter cells
Exact copy- in stages
See p. 134 WB

14. Meiosis
Cell division in which male & female gametes are produced for sexual reproduction
1 diploid cells divides into 4 haploid cells
ex. Sperm or Ova
Haploid cells: 1 set of chromsomes