2. Organisms: It is alive if…
Has a life span
Can reproduce
Grows

3. Organisms: It is alive if…
Is made of cells
Requires energy
Responds to its environment

4. Organisms have life spans.

6. cell
a tiny unit of living material surrounded by a thin membrane

7. cytoplasm
the living material inside of a cell

8. organic compound
substance that has carbon in it and is normally made by living cells

9. unicellular organisms
organisms made of only one cell

10. multicellular organisms
organisms that are comprised of more than one cell

11. tissue
a collection of similar cells that work together within an organism

12. colonial organisms
organisms made of many cells that usually live together but could live by themselves

13. energy
the ability to do work

14. physical life
a complex organization of nonliving substances that is kept alive by using energy and having characteristics of living things

15. The Cell Theory All cells come from preexisting cells.
All living things are made of cells and of the products of cells.

16. The Cell Theory
The functions of living things are performed by the cells they are made of.

17. Cellular Functions All cells use energy.
All cells manufacture materials.
All cells respond to their environment.
All cells can reproduce themselves.

18. molecule
smallest unit existing as a particular substance

19. atoms
molecules
cells

20. Four Categories of Molecules in Cells
carbohydrates
proteins
nucleic acids
lipids

21. carbohydrates
composed of carbon, hydrogen, and oxygen atoms

22. Sugars and Starches
glucose
cellulose
starch
glycogen

23. proteins
made up of smaller molecules called amino acids

24. Protein Functions structural support storage
transporting other substances

25. Protein Functions signaling from one part of an organism to another
defense against foreign substances
regulate life-supporting processes

26. nucleic acids
contain all the instructions that living cells need to make proteins and maintain life

27. lipids
fats

28. Molecules in Living Organisms
Made of
Examples
carbon, hydrogen, oxygen
sugar, starch, cellulose, glycogen
carbohydrate
enzymes, antibodies,
food storage
amino acids
protein
nucleic acid
nucleotides
DNA, RNA
lipid molecules
membranes, fat
lipid