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TLS Online TPP Program

#Question id: 1121

Which of the following provides the best evidence that cell-signaling pathways evolved early in the history of life?

#Unit 4. Cell Communication and Cell Signaling

  1. Cell-signaling pathways are seen in "primitive" cells such as bacteria and yeast.

  2. Bacteria and yeast cells signal each other in a process called quorum sensing.

  3. Signal transduction molecules identified in distantly related organisms are similar.

  4. Most signals in all types of cells are received by cell surface receptors.

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TLS Online TPP Program

#Question id: 7159

#Unit 5. Developmental Biology

'Intercalary growth' in a regenerating amphibian limb means that if a distal blastema is grafted to a proximal stump:
TLS Online TPP Program

#Question id: 7160

#Unit 5. Developmental Biology

How does the dose-dependence of retinoic acid treatment support the notion that a gradient of retinoic acid can act as a morphogen along the proximo-distal axis in the limb?
TLS Online TPP Program

#Question id: 7161

#Unit 5. Developmental Biology

What is especially exciting about research into regeneration in zebrafish?
TLS Online TPP Program

#Question id: 7162

#Unit 5. Developmental Biology

Is regeneration in Hydra similar to regeneration in vertebrates, or is it fundamentally different in some way?
TLS Online TPP Program

#Question id: 7163

#Unit 5. Developmental Biology

What statement is correct when comparing morphallaxis and epimorphosis?
TLS Online TPP Program

#Question id: 7164

#Unit 5. Developmental Biology

If an amphibian zygote is manipulated so that the first cleavage plane fails to divide the gray crescent, then ________.