Cells are the basic unit of living organisms. Robert Hooke first observed cells in 1665 and Scheleiden and Schwann proposed the first cell theory in 1838. Cells have a membrane that separates them from the environment, genetic material that controls cellular activity, and cytoplasm for biochemical reactions. Cells take in nutrients through nutrition, interact with their environment, and reproduce through forming identical daughter cells. Cells can be classified by size, shape, and complexity as either prokaryotic without organelles or eukaryotic with organelles like the nucleus, mitochondria, chloroplasts, and more. Cell division occurs through mitosis and meiosis.

2. We are the basic unit of all living organisms.
The cells were discovered when I was invented.
Robert Hooke was the first person to observe cells in 1665.
And in 1838 Scheleiden and Schwann proposed the first cell theory

3. CELLS STRUCTURE
THE MEMBRANE: It is a thin layer
which separates the cell from the
external environment
GENETIC MATERIAL: it is
made up of molecules that
contain the information
required to control cellular
activity
CYTOPLASM: semi-liquid interior of cell
that contains biological molecules which
are needed to carry out the biochemical
reaction to keep the cell alive

4. CELLS FUNCTIONS
NUTRITION
INTERACTION
REPRODUCTION
Definition: it is when the cell takes different molecules from the external environment and transforms them into energy.
 The transformations happen thanks to a process called metabolism.
 At the end of the nutrition process the waste products are expelled out the cell.
Definition: it is the cell communicationwith the external environment.
 There are two types of actions: receiving information and responding to the ctected changes.
Definition: it is the formation of new cells from existing ones.
 The genetic material of the parent cell are transmitted to the daughter cells.
 Daughter cell are always identical to their parent cell.

5. TYPES OF CELLS
The cells can be classified according to
Their size: it can be from 1 micrometre to over 100 micrometres.
 Their shape: spherical, flat, long or star-shaped.
 Their complexity: they can be prokaryotic (only bacteria and cyanobacteria) or eukaryotic (the rest of organisms)
PROKARYOTIC CELL
It does not have cellular organelles and membranes
EUKARYOTIC CELL

6. EUKARYOTIC CELLS
1.- TYPES
Plant cell

7. 2.-ORGANELLES
-Organelles that process nutrients
Endoplasmatic reticulum
Golgi apparatus
Lysosomes
Vacuoles
-Organelles that produce energy
Mitochondria: cellular respiration
Chloroplasts: photosynthesis

8. 2.- NUCLEUS

9. CELL DIVISION
THE MITOSIS

10. THE MEIOSIS