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What Characteristics do all Living Things Share?

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One of the realities of life is that all life eventually comes to an end. ... Classification- the process of grouping things based on their similarities. – PowerPoint PPT presentation

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Title: What Characteristics do all Living Things Share?


1
What Characteristics do all Living Things Share?
  • All living things have a cellular organization.
  • A cell is the basic unit of life.
  • Unicellular- one celled (i.e. bacteria)
  • Multicellular- more than one cell (i.e. animals)

2
Prokaryotes vs. Eukaryotes
  • Prokaryotes are organisms that DO NOT have a
    nucleus. Ex. Bacteria
  • Eukaryotes are organisms that have a nucleus. Ex.
    Animals, humans, plants

3
  • Cells are composed of chemicals.
  • Water- the most abundant
  • Carbohydrates- for energy
  • Proteins and lipids- building materials
  • Nucleic Acids- contain genetic material

4
  • Living things react to stimuli.
  • A stimulus is something in the environment
    that causes a reaction, or a response.
  • A response is an action or change in behavior.

5
  • Living things grow and develop.
  • Growth- an increase in the size of an organism.
  • Development- a progressive change in an organism
    over time.

6
  • All living things have the ability to reproduce.
  • All living things arise from other living things.

7
The theory of Spontaneous Generation, which
proposed that life can appear spontaneously from
non-living things, was disproved by experiments
performed by Redi and Pasteur.
8
Life Comes from Life
  • Living things come from living things.
  • 400 years ago people though that living things
    came from non-living things (Spontaneous
    Generation).
  • Francisco Redi, Louis Pasteur did experiments to
    disprove this theory.

9
Redis Experiment
10
Louis Pasteur
  • Invented a process where bacteria could be
    removed by boiling and then cooling liquid. Ex.
    The milk you drink is pasteurized.
  • He also developed vaccinations for anthrax,
    cholera, TB, smallpox, and rabies.

11
  • All living things use energy.
  • Energy is used to nourish, repair and create new
    cells.
  • We obtain energy from converting the foods that
    we eat into energy that can be used by the cells.

12
How do Organisms Obtain Food for Energy?
  • Autotrophs- make their own food (Plants).
  • Heterotrophs- obtain food from other sources.
    (like us)
  • Herbivore- eat plants.
  • Carnivore- eat animals (meat).
  • Omnivore- eat plants and animals.

13
  • All living things will die.
  • One of the realities of life is that all life
    eventually comes to an end. This process is
    called Expiration.

14
What do All Living Things Need to Survive?
  • Water
  • Food (energy)
  • Living space
  • Stable internal conditions (Homeostasis)

15
Homeostasis
  • The maintenance of stable internal conditions
    despite changes in the environment (maintaining a
    balance in your body.)

16
More terms
  • Taxonomy- the scientific study of how living
    things are classified.
  • Binomial nomenclature-
  • Naming system in which each organism has a
    two-part name.
  • Genus and species
  • Ex Canis familiaris (dog)

17
  • Stimulus- a change in an organisms surrounding
    that cause an organism to react.
  • Response-a reaction to a stimulus
  • Structure-the way an organism is made
  • Ex Bacterial cells are rod-like.

18
  • When classifying
  • Use observable characteristics
  • DNA
  • Structure
  • When they are closely related, they share the
    same DNA.

19
  • Classification- the process of grouping things
    based on their similarities.
  • Why classify?
  • Because its easier for scientists to study.
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