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Transcript of 5--Living Things
What is Life???
Chapter 1: LIVING THINGS
Section One: What is Life?
I.Why Do Scientists Classify?
A.classification – grouping things based on similiarities
B.biologists use classification to organize living things into groups so that the organisms are easier to study
C.taxonomy is the study of how living things are classified
a. taxonomic key--determine
identity of org.
Section 2: Classifying Organisms
I. Organisms are organized by
A. cell type
B. ability to make food
C. number of cells in their bodies
Section 3: Domains and Kingdoms
II.Life Comes From Life
A.Spontaneous Generation vs. Reproduction
1.spontaneous generation –
B. Redi's Experiment
meat in jars--covered and uncovered
broth in flasks, boiled and not
D. Conclusion of both: living things come from living things
III. The Needs of Living Things
A. FOOD AND WATER
B. Living Space
C. HOMEOSTASIS---STABlE INTERNAL CONDITIONS
II.The Naming System of Linnaeus
A.binomial nomenclature – “two name naming system”
B.Genus and Species (first and second word in name)
1.genus – animals closely related
2.species – can mate with each other and
produce offspring that can reproduce
Ex.Leopard frog-- Rana pipiens
Wood frog-- Rana sylvatica
(Genus the same, species different, shows common characteristics)
What qualifies a living thing?
Respond to Surroundings
Growth and Development
Development--change throughout organisms life
All use energy to grow, repair, move etc.
Response is how organism reacts to stimulus
a stimulus is a change in an organism’s surroundings that causes the organism to react
Composed of Cells
contain similar chemicals
Produce offspring similar to parents
made of one cell
multicellular--made of many cells
III. Levels of Classification
A. The Major Levels of Classification
2. kingdom King
3. phylum Phillip
4. class Could
5. order Only
6. family Find
7. genus Green
8. species Socks
II. Domain Bacteria
1. have no nucleus
2. their DNA just floats around the cell unprotected
III. Domain Archaea
C. live in extreme environments (like boiling water or acid)
1. different chemicals than bacteria
2. different structures than bacteria
D. ancient organisms
IV. Domain Eukarya
a. have nucleus
b. DNA is in protective “case”
1. some autotrophs, others heterotrophs
2. most unicellular, some multicellular
3. many different type
4. ex: seaweed
3. most live on land, some in fresh water
4. feed on dead or decaying material
5. example: mushroom, mold, mildew
3. provide most of food for heterotrophs on land
4. most live on land, some in water
3. can inhabit any environment
4. have adaptations
a. locate food
b. capture it
c. eat it
d. digest it
More classification levels an org. shares
the more characteristics they have in common.