The placenta plays an important role in
A. implantation.
B. onset of lactation.
C. beginning of parturition.
D. provision of nutrients to the fetus.
E. insulating the fetus.
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Question 2) An embryonic cell that has the potential to develop into a wide range of tissues is called a/an
A. differentiated cell.
B. multipotent cell.
C. pluripotent cell.
D. omnipotent cell.
E. totipotent cell.
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Question 3) An embryonic cell that contains the potential to give rise to any tissue type is called a/an
A. differentiated cell.
B. multipotent cell.
C. pluripotent cell.
D. omnipotent cell.
E. totipotent cell.
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Question 4) Once the embryonic mass has 12 or more cells, it is called a
A. morula.
B. gastrula.
C. blastula.
D. blastocyst.
E. trophoblast.
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Question 5) The single layer of cells that surrounds the blastocele is the
A. morula.
B. gastrula.
C. blastocyst.
D. trophoblast.
E. inner cell mass.
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Question 6) When the embryonic mass of cells develops an internal cavity, the mass of cells is called a(n)
A. zygote.
B. morula.
C. blastocyst.
D. embryonic disc.
E. trophoblast.
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Question 7) Fusion of the male and female pronuclei forms the
A. blastocyst.
B. morula.
C. zygote.
D. gastrula.
E. trophoblast.
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Question 8) Depolarization of the oocyte plasma membrane occurs when the first sperm attaches to the integrin 61. This is called the
A. slow block to polyspermy.
B. acrosomal reaction.
C. fast block to polyspermy.
D. fertilization.
E. spermiogenesis.
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Question 9) If the zygote splits into two separate cells,
A. identical twins result.
B. fraternal twins result.
C. dizygotic twinning occurs.
D. both cells die.
E. paternal twins result.
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Question 10) If a woman ovulates two oocytes and both are fertilized,
A. identical twins result.
B. fraternal twins result.
C. Siamese twins result.
D. monozygotic twinning occurs.
E. paternal twins result.
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