Chapter 1 Lecture slides for Mr. Masons Biology I,Hon. class.

1. Biology : The Science
of Life
section 1 The World of Biology
section 2 Themes in Biology

2. Biology and You
Biology - “the study of life”
the natural world
bacteria to elephants
food to exercise
environment
bioethics - biology in context of society

3. Characteristics of Life
Life has changed since it first appeared on the planet,
Today, biologist identify a living thing through
observation of shared characteristics.

4. Organization
Self-directed Organization
cell - basic unit of structure and
function (organelles and biomolecules)
unicellular or multicellular

5. levels of organization
cells
tissues
organs
organ system
organism
population --> community -->
ecosystem --> biome -->biosphere

6. Response to Stimuli
stimulus-response
stimulus - causal event in environment
response - reaction to causal event

7. Homeostasis
responses in an organism which
maintain stable internal conditions in a
changing environment
light, temperature, water

8. Growth and Development
growth - increase in size
growth - increase in the number of cells
through cell division
development - series of changes during
growth due to cell specialization

9. Reproduction
making more of ones own kind - species
asexual
sexual
Inherited set of instructions in the
nucleic acids DNA or RNA

10. Evolution
species change over time
mutation
variations in a population
differential survival due to “fitness”

11. Metabolism
Energy required for each characteristic
metabolism - sum of chemical reactions
to transform energy to a usable form
photosynthesis - respiration
provide material for growth and repair