Match the following cleavage patterns with the species in which they occur.

Species	Cleavage Pattern
A. Flatworm	i. Meroblastic discoidal
B. Frog	ii. Meroblastic superficial
C. Birds	iii. Holoblastic displaced radial
D. Insect	iv. Holoblastic spiral

#Question id: 1502

#Unit 4. Cell Communication and Cell Signaling

The textbook states that cells of patients with adenomatous polyposis coli (APC) “contain a deletion of a small portion of chromosome #5, which was subsequently identified as the site of a tumor-suppressor gene called APC.” In which cells of these patients would you expect to find this chromosomal deletion?

#Question id: 1503

#Unit 4. Cell Communication and Cell Signaling

When the genes responsible for familial breast cancer were sequenced, it was found that the polypeptides they encoded contained a zinc finger motif. What does this suggest to you about the normal functions of the products of these genes?

#Question id: 1504

#Unit 4. Cell Communication and Cell Signaling

Tumor-suppressor genes usually act as .......... genes, and oncogenes usually act as ...........  genes.

#Question id: 1505

#Unit 4. Cell Communication and Cell Signaling

Which of the following types of genes have not been identified as oncogenes?

#Question id: 1506

#Unit 4. Cell Communication and Cell Signaling

An oncogene codes for a growth factor receptor that is constitutively active. Of the following statements about a culture of cells expressing this gene, which would you expect to be true?

#Question id: 1507

#Unit 4. Cell Communication and Cell Signaling

The genes responsible for cancer in RNA and DNA tumor viruses are: