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Cell Theory and Prokaryote vs. Eukaryote. What is a Cell?. Cell – Basic unit of living things. Organisms are either: Unicellular – made of one cell such as bacteria and amoebas . OR Multicellular – made of many cells such as plants and animals. Scientists to Remember.

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Presentation Transcript
what is a cell
What is a Cell?
  • Cell – Basic unit of living things.

Organisms are either:

  • Unicellular – made of one

cell such as bacteria and

amoebas.

OR

  • Multicellular – made of

many cells such as plants

and animals.

scientists to remember
Scientists to Remember
  • Robert Hooke (1665) – Observed “cells” in cork
cell theory
Cell Theory
  • Confirmed discoveries that all scientists believe to be true about cells:
    • 1. Cells are the basic unit of life.
    • 2. All living things are made of cells.
    • 3. New cells are produced from existing cells.
slide5

before

true

nucleus

nucleus

The Discovery of Cells

Prokaryotic

Eukaryotic

eukaryotes
Eukaryotes
  • Has a nucleus with a nuclear envelope
  • Bigger and more complex than prokaryotes
  • Have membrane bound Organelles (golgi, ER, lysosomes…etc)
  • DNA – double-stranded and forms chromosomes (highly organized)
  • Can be uni- OR multicellular organisms
  • Ex: animals, plants, fungi
prokaryotes
Prokaryotes

NO nucleus

NO membrane bound organelles (just ribosomes)

ALL are unicellular

Smaller than eukaryotic cells

Forerunner to eukaryotic cells (smaller and more simple)

DNA – single strand and circular

Ex: ALL Bacteria

similarities
Similarities
  • Contain all four biomolecules(_
  • Have ribosomes
  • Have DNA
  • Similar Metabolism
  • Can be unicellular
  • Have cell/plasma membranes or cell wall