Genomic Analysis of the Sea Urchin Led to the Discovery

question 28

Multiple Choice

Genomic analysis of the sea urchin led to the discovery that there are no genes coding for gap-junction proteins or for adrenaline. Functionally, this suggests that

• A) there are no gap junctions in sea urchins.
• B) there is no cellular communication system in sea urchins.
• C) sea urchins are not related to vertebrates.
• D) the cellular communication system of sea urchins is unusual.

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Definitions:

Series and Shunt

Terms used to describe configurations in electrical circuits; "series" refers to components connected end-to-end, while "shunt" refers to components connected parallel to each other.

Constant Speed Motor

A motor that maintains a uniform speed under varying loads, often achieved through feedback mechanisms or specialized designs.

DC Motor

A type of electric motor that runs on direct current electricity, used in a wide variety of applications from vehicles to industrial machinery.

Shunt Motor

A motor that contains only a shunt field winding.