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Chapter One

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Chapter One Biology: ... Both molecular and cellular organization. ... Grows and Develops What is Growth? (1) Cell division ... – PowerPoint PPT presentation

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Title: Chapter One


1
Chapter One
  • Biology The Study of Life

2
I. Biology is the study of Life.
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II. What do Biologist do?
  • A. Study diversity of life

4
B. Research Diseases
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C. Develop Technologies
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D. Improve Agriculture
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E. Preserve the Environment
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III. Characteristics of Life
  • A. Anything that has or once had all the
    characteristics of life is known as an organism.

9
B. Characteristics Include
  • 1. Composed of one or more cells
  • Single-cell organisms have everything they need
    to be self-sufficient.
  • In multicellular organisms, specialization
    increases until some cells do only certain
    things.

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  • 2. Displays Organization
  • Both molecular and cellular organization.
  • Living things must be able to organize simple
    substances into complex ones.

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  • Living things organize cells at several levels
  • Tissue - a group of cells that perform a common
    function.

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  • Organ - a group of tissues that perform a common
    function.
  • Organ system - a group of organs that perform a
    common function.
  • Organism - any complete living thing.

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  • 3. Grows and Develops
  • What is Growth?
  • (1) Cell division - the orderly formation
    of new cells.
  • (2) Cell enlargement - the increase in size
    of a cell.

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  • b. What is Development?
  • (1) all the changes that occur in life.

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  • 4. Reproduces
  • Reproduction is not essential for the survival of
    individual organisms, but must occur for a
    species to survive.

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All living things reproduce in one of the
following ways
  • Sexual reproduction - Producing offspring by the
    joining of sex cells.

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  • Asexual reproduction - Producing offspring
    without the use of gametes.

21
  • 5. Responds to stimuli
  • Living things will make changes in response to a
    stimulus in their environment.

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  • 6. Require energy
  • Living things take in energy and use it for
    maintenance and growth.

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7. Maintains Homeostasis
  • Organisms keep internal conditions stable.

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  • 8. Adaptations evolve over time
  • Adaptations are traits giving an organism an
    advantage in a certain environment.
  • Variation of individuals is important for a
    healthy species

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  • Gradual accumulations of adaptations over time is
    evolution.

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IV. The Nature of Science
  • A. Science is a body of knowledge based on the
    study of nature and its physical settings.

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  • B. Theory-an explanation of a natural phenomenon
    supported by observations and experiments over
    time

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  • C. Science undergoes peer review -process by
    which the procedures and results of experiments
    are evaluated by scientists in the same field

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  • D. Science in Everyday Life
  • 1. forensics
  • 2. ethics - A system
  • defining right and
  • wrong.

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  • Here are just a few areas in life science that
    involve ethics

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Human life
  • abortion
  • euthanasia

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Heredity - parents and offspring
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Animal rights - animal rights vs human rights
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Genetics
  • - genetic engineering
  • manipulating genes
  • cloning
  • stem cells

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Use of the environment - at what financial cost
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V. The Methods of Biology
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A. Observing and Hypothesizing
  • Inferences process of making logical
    conclusions
  • Scientific methods used to gather information
    to answer questions

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B. Experimenting
  • 1. Control group and experimental group
  • 2. Independent Variable
  • 3. Dependent Variable
  • 4. Gathering Data
  • (a) Numerical Data (quantitative)
  • (b) Verbal Data ( qualitative or descriptive)
  • 5. Analyze Data

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C. Conclusion
  • 1. Publishing
  • 2. Verifying Results
  • 3. Revising!!!

40
D. Tools used in Biology
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E. Safety in the Biology Lab
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