Which of the Following Statements About the Evolution of Eye

question 39

Multiple Choice

Which of the following statements about the evolution of eye development in the ribbon worm (Lineus sanquineus) and planaria is false?

• A)Inactivating Pax6-related genes in planaria suppresses eyespot formation.
• B)Pax6-related genes are not expressed in regeneration experiments with planaria.
• C)A Pax6 homolog has been cloned in the ribbon worm.
• D)The Pax6 homolog gene in the ribbon worm is expressed at sites where eyespots will develop.
• E)Regeneration experiments involving expression of Pax6-related genes give different results in ribbon worm and planaria.

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Definitions:

Ureter

One of two tubes that carries urine from a kidney to the bladder.

Bowman's Capsule

A cup-like sac at the beginning of the tubular component of a nephron in the kidney, which encases the glomerulus and is involved in the filtration of blood.

Ammonia

A colorless gas with a penetrating odor, NH3, which is a byproduct of nitrogenous waste in organisms and used in various industrial processes.

Urea

Nitrogen-containing waste compound derived from ammonia; water is required to excrete it.