• What makes something alive?What makes something alive?

Characteristics of LifeCharacteristics of LifeCells, Energy Use, Response Cells, Energy Use, Response

to Environment, to Environment, Reproduction.Reproduction.

Learner Outcome:Learner Outcome:• I can describe the four characteristics I can describe the four characteristics

of life.of life.• I can define the following words:I can define the following words:

– CellCell– MetabolismMetabolism– HomeostasisHomeostasis– DNADNA

What is Biology?What is Biology?• Biology is the study Biology is the study

of all living things, of all living things, from cells to from cells to ecosystems.ecosystems.

• Organism: any Organism: any living thing.living thing.

All Organisms are made of All Organisms are made of CellsCells

• All living things are All living things are composed of cells.composed of cells.

• In multicellular In multicellular organisms, cells organisms, cells are specialized to are specialized to play a specific role.play a specific role.

• What types of cells What types of cells are these?are these?

All Organisms Need and Use All Organisms Need and Use EnergyEnergy• All living things use All living things use

energy through energy through metabolism:metabolism: sum of sum of all the chemical all the chemical processes that occur processes that occur in an organism.in an organism.

• Some organisms Some organisms produce their own produce their own energy while others energy while others must consume it.must consume it.

All Organisms Respond to All Organisms Respond to their Environmenttheir Environment

• All living things All living things must maintain must maintain stable internal stable internal conditions.conditions.

• This is called This is called homeostasishomeostasis..

All Organisms Pass on DNA All Organisms Pass on DNA from Parent to Offspringfrom Parent to Offspring• All living reproduce in All living reproduce in

order to pass on DNA.order to pass on DNA.• DNA: stores genetic DNA: stores genetic

information in all information in all organisms.organisms.

• Development: Development: process by which an process by which an adult organism adult organism arises.arises.

ReproductionReproduction• All species of an All species of an

organism have the organism have the ability to reproduce.ability to reproduce.

• Reproduction is not Reproduction is not essential to survival, essential to survival, but ensures but ensures continuation of a continuation of a species.species.