A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?

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#Question id: 7767

#Unit 5. Developmental Biology

How can evolution select for phenotypes that postpone reproduction or sexual maturity?” There is often a trade-off between reproduction and maintenance, and in many species reproduction and senescence are closely linked. Recent studies of mice, Caenorhabditis elegans, and Drosophila suggest that there is a conserved genetic pathway that regulates aging and that it can indeed be selected for. This pathway involves the response to insulin and insulin-like growth factors, Name of these transcription factors are

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#Question id: 14842

#Unit 5. Developmental Biology

If a specified cell is transplanted to a population of differently specified cells, the fate of the transplant will be:

A. Altered if the specification is reversible

B. Capable of differentiating by itself if the specification is reversible

C. Altered if the specification is irreversible

D. Capable of differentiating by itself if the specification is irreversible

Which of the following combination is correct?

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#Question id: 4947

#Unit 11. Evolution and Behavior

The first genes on Earth were probably

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#Question id: 4565

#Unit 11. Evolution and Behavior

Darwinʹs mechanism of natural selection required long time spans in order to modify species. From whom did Darwin get the concept of Earthʹs ancient age?

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#Question id: 12127

#Unit 10. Ecological Principles

Species richness increases