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TLS Online TPP Program

#Question id: 15416

Which of the following statements are regarding to lens induction in xenopus is incorrect?

#Unit 5. Developmental Biology
  1. Lens induction can be achieved in the presence of optic vesicle after priming of head ectoderm by the anterior neural plate.
  2. The optic vesicle can induce the presumptive head ectoderm to form the lens.
  3. Under the influence of factors secreted by the lens, the optic vesicle becomes retina.
  4. The anterior neural plate primes the head ectoderm via BMP4 and Fgf8 prior to signals from the optic vesicle.
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TLS Online TPP Program

#Question id: 8931

#Unit 9. Diversity of Life Forms

A researcher is trying to construct a molecular-based phylogeny of the entire animal kingdom. Assuming that none of the following genes is absolutely conserved, which of the following would be the best choice on which to base the phylogeny?
TLS Online TPP Program

#Question id: 8932

#Unit 9. Diversity of Life Forms

What is the correct sequence of the following four events during an animalʹs development?
1. gastrulation
2. metamorphosis
3. fertilization
4. cleavage
TLS Online TPP Program

#Question id: 8933

#Unit 9. Diversity of Life Forms

At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?
TLS Online TPP Program

#Question id: 8934

#Unit 9. Diversity of Life Forms

At which developmental stage should one be able to first distinguish a protostome embryo from a deuterostome embryo?
TLS Online TPP Program

#Question id: 8935

#Unit 9. Diversity of Life Forms

What may have occurred to prevent species that are of the same grade from also belonging to the same clade?
TLS Online TPP Program

#Question id: 8936

#Unit 9. Diversity of Life Forms

Organisms showing radial symmetry would likely