Kisan Call Centre - To harness potential of ICT in Agriculture by answer farm...
Cell,this micro universe
1. What is a cell?
Cell theory
Basic stuctions of the cell
Functions of the cell
Types of cell
2. Cells are the basic unit
of living organisms.
Smallest unit that can
carry out functions of
living organisms.
Contain Organelles
“ Small organs”
3. Robert Hooke (1500’s) was first to use the term “cell”
Schleiden (botanist) and Schwann (zoologist) (1800’s) make individual
observations about cells and form the cell theory.
Its postulates state that:
1. All living things are composed of cells
2. The cell is the simplest structural unit of all living things.
3. All cells come from other cells
4. Basic Structure of the Cell
Plasma membrane-the outermost envelope
Cytosol - fluid component within the cell
Organelles - structures that carry out functions
Nucleus
Functions of the Cell
Communication. Cells produce and receive electrical
and chemical signals
Cell metabolism and energy release
Inheritance. Each cell contains DNA. Some cells are
specialized as gametes for exchange during sexual
intercourse
5.
6. What do ALL cells have in common?
Cell membrane (aka plasma membrane)
Cytoplasm
Genetic material (DNA or RNA)
Ribosomes (produce proteins)
Metabolism
7. Cell membrane
A selectively permeable
phospholipid bilayer that
forms a barrier between
the cell and its environment
Cytoplasm
Liquid substance that all
chemical reactions of life take
place in Has dissolved ions,
macromolecules Fills in around
the organelles of the cell
8. Genetic Material DNA is
found as either: organized
chromosomes (eukaryotes)
Inside Nucleus single, loosely
packed chromosome (prokaryotes)
Ribosomes
Two-piece protein-based organelle
that makes proteins in both major
types of cell Varies structurally in
prokaryotes and eukaryotes