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I.SPONTANEOUS GENERATION BELIEF THAT LIVING THINGS CAN ARISE FROM NON-LIVING THINGS.

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Presentation on theme: "I.SPONTANEOUS GENERATION BELIEF THAT LIVING THINGS CAN ARISE FROM NON-LIVING THINGS."— Presentation transcript:

1 I.SPONTANEOUS GENERATION BELIEF THAT LIVING THINGS CAN ARISE FROM NON-LIVING THINGS

2 -FLIES FROM ROTTING MEAT -FISH FROM LEAVES THAT FELL INTO A POND -GEESE FROM BARNACLES -MICE FROM GRAIN & RAGS -MEAL WORMS FROM FLOUR

3 A. REDI’S EXPERIMENT

4 B. PASTEUR’S EXPERIMENT

5 C. SO THERE IS AN UN- BROKEN LINE OF CELL  CELL  CELL…. MODERN LIFE AROSE FROM LIFE IN THE PAST CELLS ARISE FROM OTHER CELLS

6 II. HOW DO BIOLOGISTS ESTIMATE THE ORIGINS OF LIFE ON EARTH, AND THE AGE OF EARLIEST LIFE?

7 A.INVESTIGATE BY SCIENTIFIC METHOD -COLLECT INFORMATION -HYPOTHESIZE -TEST HYPOTHESIS THROUGH EXPERI- MENTATION

8 B. OPARIN’S HYPOTHESIS (1922) - LITTLE OR NO FREE OXYGEN IN EARTH’S EARLY ATMOSPHERE - CHON MADE UP MORE THAN 90% OF MATTER IN EARTH’S EARLY ATMOSPHERE

9 -INCREASED HEAT -INCREASED RADIATION -NO OZONE -INORGANIC MATTER

10 THESE CONDITIONS PROVIDED THE ENERGY TO CONVERT INORGANIC COMPOUNDS TO ORGANIC COMPOUNDS

11 C. MILLER TESTS OPARIN’S HYPOTHESIS ( 1950)

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13 D. HALF LIFE – TIME IT TAKES FOR ONE HALF OF A RADIOACTIVE SUBSTANCE TO DECAY

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15 E. WHY SCIENTISTS KNOW THE EARTH IS BILLIONS, NOT TENS OF THOUSANDS OF YEARS OLD

16 1.RADIOACTIVE DATING OF ROCKS ON EARTH AND MOON 2. RADIOACTIVE DATING OF FOSSILS 3. CONTINENTAL DRIFT TIME 4. CHANGES IN THE MAG- NETIC FIELD

17 5. EVIDENCE THAT ANT- ARCTICA WAS ONCE WARM 6. CORAL REEF BUILDUP 7. THICK AND NUMEROUS COAL BEDS

18 8. DEEP SEA SEDIMENTS 9. AGED VOLCANOES 10. CANYONS 11. INLAND SEAS 12. INLAND SALT BEDS 13. PETRIFIED WOOD 14……………………….

19 CELLULAR EVOLUTION

20 4.6 BYA – EARTH FORMS

21 INORGANIC COMPOUNDS JOIN TO FORM ORGANIC COMPOUNDS

22 FORM PRECELLS LIKE: LIPOSOMES, COACER- VATES, PROTEINOID MICROSPHERES

23 PRECELLS GIVE RISE TO CELLS

24 3.5 BYA – FIRST CELLS PROKARYOTIC

25 PROKARYOTIC CELLS FORM EUKARYOTIC CELLS THROUGH ENDOSYMBIOSIS

26 EUKARYOTIC CELLS FORM COLONIAL ASSOCIATIONS

27 COLONIAL CELLS FORM MULTICELLED ORGANISMS

28 0.6 BYA FIRST EVIDENCE OF MULTICELLED LIFE

29 TWO THIRDS – 2/3 OF THE HISTORY OF LIFE ON EARTH IS UNICELLULAR

30 DISCOVERIES THAT LED TO THE DEVELOPMENT OF THE CELL THEORY

31 1.ROBERT HOOKE 1665 – COINED THE TERM CELLS AFTER SEEING DEAD CORK CELLS

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33 2. ANTON VAN LEEUWENHOEK 1675 – FIRST TO OBSERVE LIVING CELLS

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37 3. MATTHIAS SCHLEIDEN 1838 - ALL PLANTS ARE MADE OF CELLS

38 4. THEODOR SCHWANN 1839 – ALL ANIMALS ARE MADE OF CELLS

39 5. RUDOLPH VIRCHOW 1855 CELLS COME FROM OTHER CELLS

40 THE CELL THEORY: 1.THE CELL IS THE BASIC UNIT OF STRUCTURE AND FUNCTION OF ALL LIVING THINGS

41 2. ALL LIVING THINGS ARE MADE OF ONE OR MORE CELLS

42 3. CELLS COME FROM OTHER CELLS THROUGH CELL REPRODUCTION

43 WHAT LIMITS A CELL IN SIZE? WHY ARE CELLS not AS LARGE AS BASKETBALLS?

44 PROKARYOTIC VS. EUKARYOTIC


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