Embryonic stem cells are derived from the
A)outer cell mass of the morula.
B)inner cell mass of the blastocyst.
C)middle layer of the zygote.
D)trophoblast.

Question

Quizplus · Accepted Answer

Embryonic stem cells are derived from the inner cell mass of the blastocyst. The blastocyst is formed around 5 days after fertilization, and consists of an outer layer of cells called the trophoblast and an inner cell mass that eventually gives rise to the embryo and other embryonic tissues. It is from this inner cell mass that embryonic stem cells are derived.

Embryonic Stem Cells Are Derived from the