Imagine you are working on a sea urchin embryo after gastrulation has begun.You isolate some of the cells that are inside the blastula.They look unspecialized,but when you culture them in a dish outside of the embryo,they secrete skeletal spicules similar to those they would have eventually formed if they had remained in the embryo.From these results,you could propose that when you isolated these cells,they were already
A) differentiated.
B) undergoing apoptosis.
C) totipotent.
D) fully grown.
E) determined.

Question

Quizplus · Accepted Answer

The cells were determined because they were already committed to forming skeletal spicules, even though they appeared unspecialized and were cultured outside of the embryo.

Imagine You Are Working on a Sea Urchin Embryo After