Question

Genomic analysis of the sea urchin led to the discovery that there are no genes present in sea urchins that code for gap-junction proteins or for adrenaline (epinephrine). Functionally, this suggests that

A.sea urchins do not encounter many pathogens.

B.sea urchins have a very simple detoxification system.

C.the cellular communication system of sea urchins is unusual.

D.sea urchins are not related to vertebrates.

Answer 1

C) cellular communication system of sea urchins is unusual.

Gap junctions are a specialised intercellular connection between different cell types and thus connects the cytoplasm of two different cells. This enables passage of molecules, ions or electrical impulses to directly pass through. Thus if there are no genes present in sea urchins that code for gap-junction proteins or for adrenaline (epinephrine), the cellular communication system of a sea urchin will be unusual and other options are incorrect.