1. The fact that organism on the earth show astounding differences in their appearance and life strategies is an example of the "" of life on our planet.

2. On the other hand, if we look closely at the molecules and the cells that make up these many organisms, we find many amazing .

3. List 3 example of similarities that organisms show at the cellular level of organization:

4. Reviewing the program as a whole, list 5 or 6 molecules that occur almost universally in living things:

5. Which molecule stores information and has the ability to make exact copies itself?

6. What is the shape of the DNA molecule?

7. Name one molecule in this program  that is composed of 4 connected "rings" with various "side groups" attached:

8. Name one molecule in this program that connected rings and is a  component of life's "genetic code:"

9. How is the sugar glucose a little bit like a "doughnut?"

10. List the 5 types of atoms that are most common in living things:

11. Scientists classify the many thousands of molecules found in living things into one of five major categories:

12. Cells can produce two common hormones called "testosterone" and "progesterone" by modifying the 4 ringed molecule we call:

13. To modify cholesterol, cells simply remove some "side groups" and them with other side groups.

14. Which of the biology's great themes is illustrated by the discussion in this program?

"--in--"

15. List some of the similarities that serve to even the most distantly-related forms of life:

Enrichment

Search the internet, CD-ROMS, and textbooks for other molecules and cellular characteristics that are widely shared within the living world