Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods. If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have
A) differentiated.
B) increased their genetic variability.
C) lost genes.
D) taken up genes from surrounding cells.
E) diffused.
Correct Answer:
Verified
Q1: Which germ layer forms the pancreas?
A) Ectoderm
B)
Q2: The cells that line the inside of
Q3: As a morula, the embryo consists of
A)
Q4: If the formation of the endoderm does
Q6: The embryo of a _undergoes direct development.
A)
Q7: Which extraembryonic membrane lies immediately beneath the
Q8: Birds hatch out of their eggs looking
Q9: The nervous system forms from the
A) endoderm.
B)
Q10: In a reptile egg, which membrane is
Q11: What is differentiation?
A) The process in which
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