Ch. 1 Ch. 1 Characteristics of Characteristics of

LifeLife

1.1. Cellular OrganizationCellular Organization

2.2. Use Energy for MetabolismUse Energy for Metabolism

3.3. Growth and DevelopmentGrowth and Development

4.4. Respond to StimuliRespond to Stimuli

5.5. HomeostasisHomeostasis

6.6. ReproduceReproduce

7.7. HeredityHeredity

Cellular OrganizationCellular Organization

A cell is the smallest unit A cell is the smallest unit capable of all life functionscapable of all life functions

Levels of Organization:Levels of Organization:

Cells Cells Tissues Tissues Organs Organs Organ Systems Organ Systems OrganismOrganism

A

B CC

Use EnergyUse Energy

Energy is needed to run life Energy is needed to run life sustaining chemical reactions, sustaining chemical reactions, like movement, growth, and like movement, growth, and repair. repair.

Metabolism is the sum of all Metabolism is the sum of all these reactions.these reactions.

MetabolismMetabolism

Metabolism manages the Metabolism manages the energy and material resources energy and material resources in a cell.in a cell.

There are two basic types.There are two basic types.

CatabolicCatabolic

Break downBreak down large molecules large molecules Releases/ Stores energyReleases/ Stores energy For example, For example, cellular cellular respirationrespiration is the process that is the process that breaks down sugar molecules breaks down sugar molecules into small energy storing into small energy storing moleculesmolecules

Anabolic Anabolic

BuildBuild larger molecules larger molecules

Uses energyUses energy

For example, For example, protein synthesisprotein synthesis is the building of large proteins is the building of large proteins from smaller molecules called from smaller molecules called amino acid.amino acid.

Growth and DevelopmentGrowth and Development

GrowthGrowth: increase of living : increase of living matter (making more cells)matter (making more cells)

DevelopmentDevelopment: change into : change into mature adultmature adult

Response to StimuliResponse to Stimuli

StimulusStimulus: a change in the : a change in the environmentenvironment

Organism respond and react to Organism respond and react to changes around themchanges around them

For example, animals run from For example, animals run from predators.predators.

Think of stimuli you react to. Think of stimuli you react to.

HomeostasisHomeostasis

HomeostasisHomeostasis: to maintain : to maintain the same internal the same internal environment in response to environment in response to changes in the external changes in the external environmentenvironmentWhat internal changes does What internal changes does your body regulate?your body regulate?

HomeostasisHomeostasis

Some examples: Some examples: temperature, water and salt temperature, water and salt levels, blood sugar levelslevels, blood sugar levels

Reproduction Reproduction

Process by which organisms Process by which organisms make more of their own kind make more of their own kind

Necessary for the survival of Necessary for the survival of the speciesthe species

Asexual and sexualAsexual and sexual

HeredityHeredity

Organisms pass hereditary Organisms pass hereditary information in genes to their information in genes to their offspring.offspring.Genes are encoded in the Genes are encoded in the molecule called DNAmolecule called DNAAllows for adaptations and Allows for adaptations and changes through timechanges through time

Tell what characteristics of life Tell what characteristics of life each item has.each item has.

SeedSeedVolcanoVolcanoChicken eggChicken eggBread doughBread doughMoldy breadMoldy breadA branch off a treeA branch off a tree

DO NOWDO NOW Think of a characteristic Think of a characteristic of life that a nonliving of life that a nonliving object might display and object might display and explain what it is.explain what it is.