[ppt]chapter 1 the science of life - · web view(list characteristics) copyright cmassengale *...

1

Introduction to Introduction to BiologyBiology

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Bell Ringer In order for something to be

considered living, it must ………. (list characteristics)

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Biology The study of living

things and their environment

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Characteristics of Life


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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 number of cells the number of cells NOT their sizeNOT their size


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Energy Use 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


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HomeostasisHomeostasis Maintain stable internal stable internal

conditionsconditions Temperature, pH, etc.Temperature, pH, etc.


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Growth & DevelopmentGrowth & Development GROWTH

Grow occurs as the result of cell cell division and cell enlargementdivision and cell enlargement

Cell division Cell division is the formation of two cells from a preexisting cellpreexisting cell

New cells enlarge as they mature When a cell grows to a size where

its surface area isn’t big enough for surface area isn’t big enough for its volumeits volume, the cell divides


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DEVELOPMENT 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 & DevelopmentGrowth & Development


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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


Living things are based on Living things are based on a universal genetic code a universal genetic code ((DNADNA))

Living organisms inherit traits from the parent organisms that created them.

HeredityHeredity

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ResponsivenessResponsiveness Respond to stimuli Respond to stimuli in

the external environment

Detect and respond to changes in light, heat, light, heat, sound and chemical sound and chemical and mechanical contactand mechanical contact

Coordinates it’s responses


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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”


[ppt]chapter 1 the science of life - · web view(list characteristics) copyright cmassengale *...

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