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1.3 Studying LifeDownloaded from http://www.biologycorner.com/bio1/notes_ch1.html#.U0Fq6q1dU08 April 6, 2014
Biology = the study of life
Bios = life | ology = study of
8 Characteristics
1.The cell - the smallest unit of lifeUnicellular = 1 celled
Multicellular =many celled
2. Reproduction
Sexual = DNA from 2 different parents
Asexual = single parent (cloning, budding)
3. Genetic Code – directions for
inheritance (DNA)
4. Growth and DevelopmentGrowth = getting larger
Development = changing shape and structure
Differentiation = cells look different and perform different functions
5. Use Energy
Metabolism = chemical reactions in the body
Animals eat to obtain energy
Plants photosynthesize
6. Response to environment
Stimulus = a signal received by one of the
senses
Response = a reaction
7. Internal Balance
Homeostasis – Biological homeostasis is the
ability of the body to maintain relative stability and
function even though drastic changes may take
place in the external environment or in one portion
of the body1
8. Evolution - species change over time
1 http://www.eoearth.org/view/article/150655/ downloaded April 7, 2014
Branches of Biology
Zoology = animals
Paleontology = ancient life
Cytology = cells
Botany = plants
Entomology = insects
You guess…
Microbiology =
Ecology =
Anthropology =
Levels of Organization
MoleculeCellTissueOrganOrgan SystemsOrganismsPopulationCommunityEcosystemBiosphere
CHECK FOR UNDERSTANDING
1. There are _________ characteristics of life
2. The smallest unit of life is the ___________
3. All living things must be able to ____________________, or to make more of their own kind.
4. All living things have a _____________________, which are like instructions for building the body
5. During development, some cells become liver cells, some become skin cells and some become muscle cells. This process is called ________________________
6. Animals get their _______________ by consuming food. Plants get it by __________________________________
7. __________________________ is the maintaining of an internal balance, or sameness
8. ______________________ is the process where species change over time.