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TLS Online TPP Program

#Question id: 7216

Following statements are about Specification of cell fate by the Dorsal protein. Which of the following statement is correct?

#Unit 5. Developmental Biology
  1. Gradient of Dorsal translocation in the ventral cells of the embryo, with the highest concentrations of Dorsal in the most ventral cell nuclei, which become the mesoderm.
  2. Gradient of Dorsal translocation in the dorsal cells of the embryo, with the highest concentrations of Dorsal in the most dorsal cell nuclei, which become the mesoderm.
  3. In the dorsalized mutant has localization of Dorsal protein in any nucleus.
  4. In the ventralized mutant, has no localization of dorsal protein in any nucleus.
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TLS Online TPP Program

#Question id: 8900

#Unit 9. Diversity of Life Forms

Which of the following statements about craniates is (are) correct?
1. Craniates are more highly cephalized than are non-craniates.
2. Craniatesʹ genomic evolution includes duplication of clusters of genes that code for transcription factors.
3. The craniate clade is synonymous with the vertebrate clade.
4. Pharyngeal slits that can assist in gas exchange originated in craniates,
5. The two-chambered heart originated with the early craniates.
TLS Online TPP Program

#Question id: 8901

#Unit 9. Diversity of Life Forms

The origin of the craniates occurred at roughly the same time as the
TLS Online TPP Program

#Question id: 8902

#Unit 9. Diversity of Life Forms

What do craniates have that earlier chordates did not have?
TLS Online TPP Program

#Question id: 8903

#Unit 9. Diversity of Life Forms

Terry detaches the snakelike organism from the fish and uses a knife to cut off its head. In doing so, its brain slides out onto the deck of the boat. Terry peers into the cut end of the head and notices that the brain had lain in a sort of pan-like structure that only partially surrounded the brain. What is the structure Terry is observing, and what is it made of?
TLS Online TPP Program

#Question id: 8904

#Unit 9. Diversity of Life Forms

Terry takes the body of the snakelike organism and slices it open along its dorsal side. If it is a hagfish, what should Terry see?
TLS Online TPP Program

#Question id: 8905

#Unit 9. Diversity of Life Forms

Terry saved some of the tooth-like objects within the hagfishʹs round mouth to analyze their composition in his mentorʹs biochemistry research lab. Terry will find that they are composed of the same protein found in reptilian