Reporter genes are used to

a. express enzymes that are not easily assayed in cell extracts.

b. express enzymes that are easily assayed in cell extracts.

c. characterize DNA control elements. 

d. characterize reporter plasmids.

#Question id: 7244

#Unit 5. Developmental Biology

Following statements are regarding to the evolutionary conservation of homeotic gene organization and transcriptional expression in fruit flies and mice.

A. In fruit flies and mice genes with similar structures occupy the same relative positions on each of the four chromosomes, and paralogous gene groups display similar expression patterns.

B. Hom-C cluster on Drosophila chromosome 3 and the four Hox gene clusters in the mouse genome are similar and evolutionary conserved.

C. Those mammalian genes homologous to the Drosophila labial, proboscipedia, and deformed genes are expressed anteriorly and early, whereas those genes homologous to the Drosophila AbdB gene are expressed posteriorly and later.

D. In fruit flies and mice genes are orthologous Hox gene groups.

E. Those mammalian genes homologous to the Drosophila labial, proboscipedia, and deformed genes are expressed posteriorly and later, whereas those genes homologous to the Drosophila AbdB gene are expressed anteriorly and early.

Which of the following combination is correct?

#Question id: 7245

#Unit 5. Developmental Biology

Gradients of Wnt are essential for normal regeneration of a head and a tail by planaria. Which one of the following statement is incorrect?

#Question id: 7246

#Unit 5. Developmental Biology

Treatment of Xenopus embryos with lithium dorsalizes the embryos by interfering with cell-cell signaling pathways. What, if anything, is the effect of lithium on hydra, and what might we infer about its mechanism of action?

#Question id: 7247

#Unit 5. Developmental Biology

Which statement correctly characterizes regeneration in the mammalian nervous system?

#Question id: 7248

#Unit 5. Developmental Biology

Planning of the Xenopus mesoderm along the dorso-ventral axis contains an antagonistic relationship between chordin and bmp-4. Is there an analogy here to dorso-ventral patterning in the Drosophila embryo?

#Question id: 7249

#Unit 5. Developmental Biology

Match the following proteins (column I) in nematodes with their functions (column II).

Which of the following is correct?