1.1C The cell is the basic unit of living things - PowerPoint PPT Presentation

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1.1C The cell is the basic unit of living things

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1.1C THE CELL IS THE BASIC UNIT OF LIVING THINGS ANSWER THE FOLLOWING Summarize the four characteristics of life. Describe the three basic needs of all living things. – PowerPoint PPT presentation

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Title: 1.1C The cell is the basic unit of living things


1
1.1C The cell is the basic unit of living things
2
Answer the following
  • Summarize the four characteristics of life.
  • Describe the three basic needs of all living
    things.
  • What is the smallest unit of a living thing?
  • Explain the difference between Unicellular and
    Multicellular organisms.
  • How did the invention of the microscope lead to
    the discovery of cells?
  • What is the cell theory?
  • What did Louis Pasteur discover and what did he
    develop as a result?
  • What is spontaneous generation? Is it a valid
    theory? Why or why not?

3
Living things vs. Non living things
  • What makes a living thing different from a non
    living thing?
  • There are 4 characteristics of life
  • Organization
  • How is the body organized?
  • The ability to develop and grow
  • The ability to respond to the environment
  • The ability to reproduce

4
What do living things need to survive?
  • 3 basic needs
  • Energy
  • Where does the energy come from?
  • Plants use the Sun directly
  • Animals use food from plants or other organisms
    that eat the plants
  • Materials
  • What kind of materials do organisms need?
  • Carbon Dioxide, nitrogen, oxygen and water
  • Where does most of this come from?
  • Food
  • Space to live and grow
  • What happens if any of these requirements are
    missing?

5
What are living things made of?
  • Cells smallest unit of a living thing
  • Can be unicellular or multicellular..whats the
    difference?
  • Unicellular made of a single cell and too small
    to see
  • Multicellular made up of many cells, each having
    a different function
  • What is the difference between the needs and
    characteristics of a unicellular organism and a
    multicellular organism?
  • All have the same needs and characteristics
  • Unicellular one cell carries out all of the
    activities for life
  • Multicellular cells are specialized to do
    different jobs

6
The importance of the microscope
  • Instrument that makes an object appear
  • bigger than it is
  • First came into use in the 1600s
  • Robert Hooke and Anton van Leeuwenhoek
  • were some of the first to describe cells
  • Hooke named the cell after looking at bark
  • cells (30X)
  • He noticed little compartments, which he named
  • after the little rooms that monks lived
    inCells
  • Van Leeuwenhoek described the cell after
  • looking at pond water (300X)
  • He noticed that the water was full of moving
    living things

7
Do all living things have cells?
  • Scientists started studying samples from various
    forms of living matter
  • Found cells in all of them
  • Not all were exactly the same
  • Saw that living cells divide
  • All of these findings led to the Cell Theory
  • Every living thin is made of one or more cells
  • Cells carry out the functions needed to support
    life
  • Cells come only from other living cells
  • What is a theory?

8
Other Important Scientists
  • Matthais Schleiden concluded that all plants are
    made of cells
  • Theodor Schwann concluded that all animals are
    made of cells
  • Rudolf Virchow concluded that all cells come from
    other cells

9
Louis Pasteur
  • Showed cell theory in the real world
  • Microscopic organisms are a cause of both
    spoilage of food and disease
  • Experiments showed that microscopic organisms
    (bacteria) were present in milk causing it to
    sour
  • Developed a process of pasteurizations using heat
    to kill bacteria
  • Started to wonder if these also caused illness in
    humans and animals
  • Led to treatment of rabies in humans
  • Disproved theory of spontaneous generation the
    belief that bacteria grew from nonliving things
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