1. Levels of Organization from smallest to largest
Subatomic particles
atom
molecules
macromolecules
organelles
cell
tissue
organ
Organ system
organism
population
community
ecosystem
biome
biosphere

2. From simplest to most complex:
Subatomic particles
Atom
Molecule
Macromolecule
Organelles
Cell
Tissue
Organs
Organ system
Organism
Population
Community
Ecosystem
Biomes
Biosphere

3. 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

4. ATOMS The basic building blocks of all matter, living and non-living
Smallest part of matter
NON-living
The basic building
blocks of all matter,
living and non-living
EX: Hydrogen, Oxygen, Nitrogen…

5. Molecules 2 or more bonded atoms Form compounds
EX: H2O, CH4 , Acids, Salts, Alcohols, Amino Acids
NON-living

6. Macromolecule Large network of molecules
Proteins, fats, carbohydrates, nucleic acids
NON-living

7. Organelles
“Tiny organs” made of macromolecules
Organelles: specific function “parts of cell” - transfer of materials across membranes, photosynthesis, oxidation
EX: nucleus, ribosome, lysosome

8. Cell Cell: smallest functional unit of life
Made of organelles
Cell: smallest functional unit of life
EX: neurons(brain cells), lung cells, cardiac cells
(heart cells)
LIVING

9. Tissue Cells of one type working together
Specialization in performance of one function for the benefit of entire organism

10. Organs Multiple types of tissues that work together
Ex – Brain, lungs, heart
Living

12. Organ System
Multiple organs with common theme EX: nervous system (brain, spinal cord and nerves)

13. Organism Usually made of systems May be a single cell Living
Entire living things (organisms)
Usually made of systems
May be a single cell
Living

14. Population All the members of one species in a specific area
Same type of organism living together
All the members of one species in a specific area
EX: “pack of wolves”

15. Community All the organisms within a specific area: many species
Population interact

16. Ecosystem Biotic: living Abiotic: nonliving
A biotic (living) community plus the abiotic (nonliving) features
Biotic: living
Abiotic: nonliving

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

18. Biosphere Includes abiotic features
Whole living layer around the globe
Includes abiotic features

20. 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?

21. 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

22. 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.

23. 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.

24. Answers
Question 1: B. community.
Question 2: C. population.