In Xenopus, the elongation of the mesoderm toward the anterior results from the intercalation of cells during a process called:

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#Question id: 12577

#Unit 10. Ecological Principles

During  a  field  trip,  an  instructor  touched  a  moth  resting  on  a  tree  trunk.  The  moth  raised  its  forewings  to  reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings. One student answered that sensory  receptors  had  fired  and  triggered  a  neuronal  reflex  culminating  in  the  contraction  of  certain  muscles.  A second student responded that the behaviour might frighten predators. Which statement best describes these explanations?

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#Question id: 4934

#Unit 11. Evolution and Behavior

What is another hypothesis regarding the formation of polymers such as proteins and nucleic acids?

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#Question id: 28215

#Unit 5. Developmental Biology

In the frog (Xenopus laevis) a gradient of the paracrine factor activin, which of the following observation is correct at the lower concentrations of activin ?

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#Question id: 11198

#Unit 7. System Physiology – Animal

The "undershoot" phase of hyperpolarization is due to ________.

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#Question id: 11956

#Unit 7. System Physiology – Animal

An advantage of a complete digestive system over a gastrovascular cavity is that the complete system ________.