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TLS Online TPP Program

#Question id: 5001

Fossil evidence indicates that several kinds of flightless dinosaurs possessed feathers. If some of these feather-bearing dinosaurs incubated clutches of eggs in carefully constructed nests, this might be evidence supporting the claim that

#Unit 11. Evolution and Behavior

  1. dinosaurs were as fully endothermal (warm-blooded) as modern birds and mammals.

  2. their feathers originally served as insulation, and only later became flight surfaces.

  3. the earliest reptiles could fly, and the feathers of flightless dinosaurs were vestigial flight surfaces.

  4. the feathers were plucked from the bodies of other adults to provide nest-building materials.

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TLS Online TPP Program

#Question id: 7243

#Unit 5. Developmental Biology

Match the following:

Column I

       Column II

A. Anterior necrotic zone

I. Rapid apoptosis that occurs when epithelial cells lose their attachment to the extracellular matrix.

B. Anoikis

II. Devoid of any neural innervation.

C. Aneurogenic

III. Mammalian equivalent to the chick hypoblast and similar to the head portion of

the amphibian organizer, it creates an anterior region by secreting antagonists of Nodal.

D. Anterior visceral endoderm

IV. A zone of programmed cell death on the anterior side of the developing tetrapod limb that helps shape the limb.


TLS Online TPP Program

#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?
TLS Online TPP Program

#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?
TLS Online TPP Program

#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?
TLS Online TPP Program

#Question id: 7247

#Unit 5. Developmental Biology

Which statement correctly characterizes regeneration in the mammalian nervous system?
TLS Online TPP Program

#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?