Levels of Organization from smallest to largest

• From simplest to most complex:– Subatomic particles

– Atom– Molecule

– Macromolecule– Organelles

– Cell– Tissue– Organs

– Organ system– Organism– Population– Community– Ecosystem

– Biomes– Biosphere

• Subatomic particles– electrons outside nucleus;

negative charge; small mass

– protons in nucleus positive charge

– neutrons in nucleus no charge involved in

• Energy transformations,• Radioactivity, subatomic reactions and

particle formation

ATOMS• Smallest part of matter

• NON-living

•The basic buildingblocks of all matter,living and non-living

•EX: Hydrogen, Oxygen, Nitrogen…

Molecules

• 2 or more bonded atoms

• Form compounds

• EX: H2O, CH4 , Acids, Salts, Alcohols, Amino Acids

• NON-living

Macromolecule

• Large network of molecules

• Proteins, fats, carbohydrates, nucleic acids

• NON-living

Organelles• “Tiny organs” made of macromolecules

• Organelles: specific function “parts of cell” - transfer of materials across membranes, photosynthesis, oxidation

• EX: nucleus, ribosome, lysosome

Cell• Made of organelles

• Cell: smallest functional unit of life

• EX: neurons(brain cells), lung cells, cardiac cells (heart cells)

• LIVING

Tissue

• Cells of one type working together

• Specialization in performance of one function for the benefit of entire organism

Organs

• Multiple types of tissues that work together

• Ex – Brain, lungs, heart

• Living

Organ System• Multiple organs

with common theme EX: nervous system (brain, spinal cord and nerves)

Organism• Entire living things (organisms)

• Usually made of systems

• May be a single cell

• Living

Population• Same type of organism living together

• All the members of one species in a specific area

• EX: “pack of wolves”

Community

•All the organisms within a specific area: many species

• Population interact

Ecosystem• A biotic (living) community plus the abiotic (nonliving) features

Biotic: livingAbiotic: nonliving

Biome

• General areas with uniform plant life due to levels of precipitation and temperatures.

Biosphere • Whole living layer around the globe

• Includes abiotic features

http://people.hofstra.edu/geotrans/eng/ch8en/conc8en/envisys.html

https://www.youtube.com/watch?v=28ueTHq_fLw

Review questions• What level of organization would a puddle in your

driveway be?• What level is the tundra?• What level is a colony of ants?• What level is a protein?• What level is a finger?• What level is oxygen gas?• What two parts of an atom are in the nucleus?

Review questions• What level of organization would a puddle in your

driveway be? Ecosystem• What level is the tundra? Biome• What level is a colony of ants? Population• What level is a protein? Macromolecule• What level is a finger? Organ System• What level is oxygen gas? Atoms• What two parts of an atom are in the nucleus?

Protons and Neutrons

Question 1

• Which of the following is defined as “the living part of an ecosystem?”

A. biosphere.

B. community.

C. organism.

D. population.

E. ecosystem.

Question 2

• Which of the following is defined as “group of individuals of a particular type that live in the same area and actively interbreed with one another?”

A. ecosystem.

B. community.

C. population.

D. organism.

Answers

Question 1: B. community.

Question 2: C. population.