QUESTIONS: (True/False )

1. The nucleus of a single-cell embryo is composed of a haploid number of chromosome
2. The main thought of this article is how cells begin to differentiate.
3. Endo 16 is a specific cell in the gut of a sea urchin.
4. Gene activity is controlled by chemicals known as transcription factors.
5. Endo 16 is only found in the gut of the sea urchin.
6. Transcription factors act only as modules to turn genes "on" or "off".
7. Bicoid is a blood protein in the fruit fly, Drosophila.
8. Understanding the yeast genome can lead to greater understanding of human genes.

QUESTIONS: (Multiple Choice)
9. Transcription factors:
a. act as on/off switches
b. need a specific binding site
c. are found in clusters
d. all of the above
e. only a, c
10. Bicoid, in Drosophila:
a. is a transcription factor
b. tells the fruit fly what the front end should look like
c. sometimes does not bind to the gene
d. all of the above
e. only a and b
11. Choose the incorrect analogy:
a. Gradient is to concentration
b. Dorsal is to Bicoid
c. Haploid is to embryo
d. Transcription factor is to morphogen
e. Module is to cluster

QUESTIONS: (Essay)
12. Discuss the experiment researchers came up with and the results they discovered utilizing the sea urchin Strongylocentrotus purpuratus.
13. Discuss concentration gradients; explain the conclusions scientists made with Drosophila (common fruit fly); incorporate the concept of "modules" in your discussion.
14. Why do scientists feel it is important to understand the yeast genome sequence and biochemical processes?