Copyright Cmassengale
Warm - UpWhat are the properties of life
according to you?(These are the properties that all living
things have in common.)
HomeworkNone tonight
2
Biology – The Study of Biology – The Study of LifeLife
Life arose more than 3.5 billion years ago
First organisms (living things) were single celled
Only life on Earth for millions of years
Organisms changed over time (evolved)
Modified from Cmassengale
3
New organisms arose from older kinds
Today there are millions of species
They inhabit almost every region of Earth today
Copyright Cmassengale
Copyright Cmassengale
Seven Properties of LifeOrder
Use Energy(Cellular Respiration)
Growth\DevelopmentStore Information
Respond to StimulusReproductionAdaptation
5
Order:Order:Matter, Energy and OrganizationMatter, Energy and Organization
Living things are highly organized
An organism's/it’s structures form (or the way it is shaped) will determine its function.
Copyright Cmassengale
6
Order:Order:Structure and Function of CellsStructure and Function of Cells
Cells are the basic unit of life
All organisms are made of cells and develop from one cell
Most composed of only a single cell (unicellular) which is usually identical to parent
Copyright Cmassengale
7
Order:Order:CellsCells Some organisms are
composed of many cells (multicellular) Cells are different
(undergo differentiation)
Cells are small Cells are highly
organized
Copyright Cmassengale
8
Cells contain specialized structures (organelles) that carry out the cell’s life processes
Many different kinds of cells exist
All cells are surrounded by a plasma membrane
Cells Contain a set of instructions called DNA (genetic information)
Copyright Cmassengale
Order:
9
EnergyEnergy ALL energy comes from the SUN
(directly or indirectly) Photosynthesis is the process by
which some organisms capture the energy from the sun (solar) and transform it into energy (chemical) that can be used by living things
Copyright Cmassengale
10
Energy:Energy:AutotrophsAutotrophs
Organisms that make their own food are called autotrophs
Phototrophs – use solar energy (photosynthesis) to get energy Convert H2O and CO2
into sugar and O2 Chemotrophs – use
different chemical processes to get energy
Copyright Cmassengale
11
Energy:Energy:HeterotrophsHeterotrophs
Organisms that must take in food to meet their energy needs are called heterotrophsheterotrophsConsume autotrophs (herbivores), (herbivores), other heterotrophs (carnivores) (carnivores) or both (omnivores) (omnivores) for their energy needs
Complex Molecules chemicals from prey are broken down and reassembled into reassembled into molecules molecules and structures needed by organisms
Copyright Cmassengale
Development and Growth All living things grow or get
bigger. Even single celled organisms do so after splitting.
Most organisms develop or change/mature while growing. To develop is to change your
behavior and/or structures over time
Modified from Cmassengale
13
Store Information:Store Information:DNADNA
Deoxyribonucleic Acid Genetic Information in all cells DNA contains instructions for
traits GENES Store the information to make
the structures and complex chemicals necessary for life PROTEINS
DNA in every body cell (SOMATIC CELLS) is exactly alike
Copyright Cmassengale
14
Respond to StimulusRespond to Stimulus Respond to stimuli Respond to stimuli in
the external and internal environment
Detect and respond to changes in the environment like light, heat, sound light, heat, sound and chemical and and chemical and mechanical contactmechanical contact
Coordinates it’s responses
Copyright Cmassengale
15
Respond to StimulusRespond to Stimulus(Homeostasis)(Homeostasis)
Organisms must Maintain very stable internal conditions - HOMEOSTASIS
Like temperature, water content, pH, chemical content, etc. must be maintained at specific ranges
Copyright Cmassengale
16
Reproduce:Reproduce:Reproduction and Reproduction and
InheritanceInheritance All organisms produce new
organisms like themselves REPRODUCE
Organisms transmit hereditary information to their offspring INHERITANCE
Copyright Cmassengale
17
Reproduce:Reproduce:Sexual ReproductionSexual Reproduction
Hereditary information from two different organisms of the same species are combined
Egg and sperm zygote (fertilized egg)
Zygote contains hereditary information from both parents
Copyright Cmassengale
18
Reproduction:Reproduction:Asexual ReproductionAsexual Reproduction
Hereditary information from one, usually unicellular, organism that divides
Resulting cells contain identical hereditary information
Genetic information from single parent
Copyright Cmassengale
19
Adaption:Adaption:EvolutionEvolution
Populations of organisms change (evolve) over generations (time)
Explains how many different kinds of organisms came into existence SPECIES
Explains how modern organisms are related to past organisms
Copyright Cmassengale
20
Explains why organisms look and behave the way they do
Provides a basis for exploring the relationships among different groups of organisms
Copyright Cmassengale
AdaptationEvolution
21
Adaptation:Adaptation:Natural SelectionNatural Selection
Natural selection is the driving force in evolution Organisms that have
certain favorable traits, for a given environment, will successfully reproduce more than organisms that lack these traits
Copyright Cmassengale
22
Adaptation:Adaptation:Natural SelectionNatural Selection
Survival of organisms with favorable traits cause a gradual change in populations over many generations
Also Called “Survival of the Fittest”
Copyright Cmassengale
23
Characteristics of Life
Copyright Cmassengale
24
Order (Cells) All living things are
composed of cellscells In multicellular
organisms, many are specializedspecialized to perform specific functions
Cells are always very smallsmall
The size of multi-celled organisms depends on the the number of cells NOT number of cells NOT their sizetheir size
Copyright Cmassengale
25
Order Organized at both
the molecular and molecular and cellular levelscellular levels
Take in substances from the environment and organize them in complex ways
Specific cell structures (organelles) (organelles) carry out particular functions
Copyright Cmassengale
26Copyright Cmassengale
27
In multicellular multicellular organisms, organisms, cells and groups of cells (tissues) are organized by their function CellsCells
tissues TissuesTissues
organs Organs Organs systemssystems SystemsSystems ORGANISMORGANISM
Copyright Cmassengale
28
Use Energy Use energy in a process called
metabolismmetabolism Sum of all chemical processesSum of all chemical processes
Require energy to maintain their molecular and cellular organization, grow and reproduce
Copyright Cmassengale
29
Responds to stimulus:Responds to stimulus:Example-HomeostasisExample-Homeostasis Maintain stable internal stable internal
conditionsconditions Temperature, pH, etc.Temperature, pH, etc.
Copyright Cmassengale
30
Growth and Development:Growth and Development:GrowthGrowth
Grow occurs as the result of cell division and cell cell division and cell enlargementenlargement
Cell division Cell division is the formation of two cells from a preexisting preexisting cellcell
New cells enlarge as they mature
When a cell grows to a size where its surface area isn’t surface area isn’t big enough for its volumebig enough for its volume, the cell divides
Copyright Cmassengale
31
The process by which an adult process by which an adult organism arise organism arise is called developmentdevelopment Repeated cell divisions and cell cell
differentiationdifferentiation
Growth and Development:Growth and Development:DevelopmentDevelopment
Copyright Cmassengale
32
ReproductionReproduction All species have the ability to ability to
reproducereproduce Not essential to survival of Not essential to survival of
individual individual but is essential for continuation of a species
Copyright Cmassengale
33
Adaptation:Adaptation:EvolveEvolve
Ability to adapt to their environment through the process of evolutionevolution
Favorable characteristics Favorable characteristics are selected for and passed on to offspring
Called adaptationsadaptations Driven byDriven by
natural selectionnatural selectionoror “survival of the “survival of thefittest”fittest”
Copyright Cmassengale