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TLS Online TPP Program

#Question id: 28513

To induce Fgf8 expression by Fgf10, once Fgf8 is made in the surface ectoderm, the surface ectoderm elongates to physically become the AER. which one is the main functions of the AER?

#Unit 5. Developmental Biology
  1. to maintain the activation of both Wnt3a and Tbx4
  2. to tells the surface ectoderm to continue to make Fgf8
  3. to maintain activation of both Wnt2b and Tbx5
  4. to tell the mesenchyme cells directly beneath it to continue making Fgf10
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TLS Online TPP Program

#Question id: 5313

#Unit 11. Evolution and Behavior

Which of the following statements correctly describes one of the characteristics of alternative splicing in vertebrate genomes?
TLS Online TPP Program

#Question id: 5314

#Unit 11. Evolution and Behavior

Which of the following statements correctly describes one characteristic of a multigene family?
TLS Online TPP Program

#Question id: 5315

#Unit 11. Evolution and Behavior

In humans, the embryonic and fetal forms of hemoglobin have a higher affinity for oxygen than that of adults. Why is this the case?
TLS Online TPP Program

#Question id: 5316

#Unit 11. Evolution and Behavior

Why is sequencing of eukaryotic genomes more difficult than sequencing genomes of bacteria or archaea?
TLS Online TPP Program

#Question id: 5317

#Unit 11. Evolution and Behavior

How do transposable elements and short tandem repeats (STRs) differ?
TLS Online TPP Program

#Question id: 5318

#Unit 11. Evolution and Behavior

 Humans have 23 pairs of chromosomes, and chimps have 24 pairs of chromosomes. What is the most likely explanation for these differences in human and chimp genomes?